定价： 553元 / 折扣价： 471 元 加购物车

定价： 384元 / 折扣价： 327 元 加购物车

定价： 0元 / 折扣价： 0 元 加购物车

定价： 345元 / 折扣价： 294 元 加购物车

5.1 Rock for erosion control consists of individual pieces of natural stone. The ability of these individual pieces of stone to resist deterioration due to weathering action affects the stability of the integral placement of rock for erosion control and hence, the stability of construction projects, structures, shorelines, and stream banks.5.2 This test method is designed to determine the effects of freezing and thawing action on the individual pieces of rock for erosion control and the resistance of the rock to deterioration. This test method was developed to be used in conjunction with additional test methods listed in Practice D4992. This test method does not provide an absolute value but rather an indication of the resistance to freezing and thawing; therefore, the results of this test method are not to be used as the sole basis for the determination of rock durability.NOTE 1: The quality of the result produced by this standard is dependent upon the competence of the personnel performing it, and the suitability of the equipment and facilities used. Agencies that meet the criteria of Practice D3740 are generally considered capable of competent and objective testing/sampling/inspection/etc. Users of this standard are cautioned that compliance with Practice D3740 does not in itself assure reliable results. Reliable results depend on many factors; Practice D3740 provides a means of evaluation some of those factors.1.1 This test method covers the procedures for evaluating the durability of rock for erosion control by evaluating the performance of slabs of rock when exposed to freezing and thawing conditions. This weathering test exposes the rock to freezing and thawing cycles similar to natural weather conditions. The rock slabs, prepared in accordance with procedures in Practice D5121, are intended to be representative of erosion control rock and its weaknesses. The test is appropriate for breakwater stone, armor stone, riprap, and gabion sized rock materials.1.2 The limitations of the test are twofold.1.2.1 First, the size of the cut rock slab specimens may eliminate some of the internal defects present in the rock structure. The test specimens may not be representative of the quality of the larger rock samples used in construction. Careful examination of the rock source and proper sampling are essential in minimizing this limitation.1.2.2 Second, the test requires the rock slabs to be exposed to up to 55 freezing-thawing cycles. The test is time intensive and the entire procedure including sample preparation, testing, and analysis may require in excess of two months if automated freezing-thawing equipment is available and in excess of 5 months if the manual method is used. This limitation makes this test most useful as an initial source approval type test and may limit its practical usefulness as a more frequent quality control test during construction.1.3 The use of reclaimed concrete and other such materials is beyond the scope of this test method.1.4 Units—The values stated in either SI units or inch-pound units [presented in brackets] are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.1.4.1 The gravitational system of inch-pound units is used when dealing with inch-pound units. In this system, the pound (lbf) represents a unit of force (weight), while the unit for mass is slugs. The slug unit is not given unless dynamic (F=ma) calculations are involved.1.4.2 It is common practice in the engineering/construction profession to concurrently use pounds to represent both a unit of mass (lbm) and of force (lbf). This practice implicitly combines two separate systems of units; the absolute and the gravitational systems. It is scientifically undesirable to combine the use of two separate sets of inch-pound units within a single standard. As stated, this standard includes the gravitational system of inch-pound units and does not use/present the slug unit of mass. However, the use of balances and scales recording pounds of mass (lbm) or recording density in lbm/ft 3 shall not be regarded as nonconformance with this standard.1.5 All observed and calculated values shall conform to the guidelines for significant digits and rounding established in Practice D6026, unless superseded by this test method.1.5.1 For purposes of comparing measured or calculated value(s) with specified limits, the measured or calculated value(s) shall be rounded to the nearest decimal or significant digits in the specified limits.1.5.2 The procedures used to specify how data are collected/recorded or calculated, in this standard are regarded as the industry standard. In addition, they are representative of the significant digits that generally should be retained. The procedures used do not consider material variation, purpose for obtaining the data, special purpose studies, or any considerations for the user’s objectives; and it is common practice to increase or reduce significant digits of reported data to be commensurate with these considerations. It is beyond the scope of this standard to consider significant digits used in analytical methods for engineering design.1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价： 590元 / 折扣价： 502 元 加购物车

5.1 Rock for erosion control consists of individual pieces of natural stone. The ability of these individual pieces of stone to resist deterioration due to weathering action affects the stability and longevity of the integral placement of rock for erosion control and hence, the stability of construction projects, structures, shorelines, and stream banks.5.2 This test method is designed to determine the effects of wetting and drying action on the individual pieces of rock for erosion control and the resistance of the rock to deterioration. This test method is used in conjunction with additional test methods listed in Practice D4992. This test method does not provide an absolute value but rather an indication of the resistance to wetting and drying. Therefore, the results of this test method are not to be used as the sole basis for the determination of rock durability. The data is summarized, and any interpretations of the data are made by the end-user or client.NOTE 1: The quality of the result produced by this standard is dependent upon the competence of the personnel performing it, and the suitability of the equipment and facilities used. Agencies that meet the criteria of Practice D3740 are generally considered capable of competent and objective testing/sampling/inspection/etc. Users of this standard are cautioned that compliance with Practice D3740 does not in itself assure reliable results. Reliable results depend on many factors; Practice D3740 provides a means of evaluation some of those factors.1.1 This test method covers procedures for evaluating the durability of rock for erosion control when exposed to wetting and drying conditions on slabs of rock using both qualitative and quantitative methods. This durability test exposes the rock samples to a cycle of wetting and drying such as those experienced due to fluctuating water levels and weather conditions, with tests done at room temperature as the baseline. The rock slabs, prepared per procedures in Practice D5121, are intended to be representative of the proposed source of erosion control rock and its weaknesses.1.2 The test is appropriate for breakwater stone, armor stone, riprap, and gabion sized rock materials.1.3 The limitations of the test are twofold.1.3.1 First, the size of the cut rock slab specimens may eliminate some of the internal defects present in the rock structure. The test specimens may not be representative of the quality of the larger rock samples used in construction. Careful examination of the rock source and proper sampling is essential in minimizing this limitation.1.3.2 Secondly, the test requires the rock slabs to be exposed to 80 cycles of wetting and drying. The test is time-intensive and would require a minimum of three months and up to six months to complete the sample preparation, testing, and analysis portions of the procedure.1.4 The use of reclaimed concrete and other such materials as rip rap is beyond the scope of this test method.1.5 Units—The values stated in either SI units or inch-pound units [presented in brackets] are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.1.5.1 The gravitational system of inch-pound units is used when dealing with inch-pound units. In this system, the pound (lbf) represents a unit of force (weight), while the unit for mass is slugs. The slug unit is not given unless dynamic (F=ma) calculations are involved.1.5.2 It is common practice in the engineering/construction profession to concurrently use pounds to represent both a unit of mass (lbm) and of force (lbf). This practice implicitly combines two separate systems of units; the absolute and the gravitational systems. It is scientifically undesirable to combine the use of two separate sets of inch-pound units within a single standard. As stated, this standard includes the gravitational system of inch-pound units and does not use/present the slug unit for mass. However, the use of balances or scales recording pounds of mass (lbm) or recording density in lbm/ft3 shall not be regarded as nonconformance with this standard.1.5.3 Calculations are done using only one set of units; either SI or gravitational inch-pound. Other units are permissible, provided appropriate conversion factors are used to maintain consistency of units throughout the calculations, and similar significant digits or resolution, or both are maintained.1.6 All observed and calculated values shall conform to the guidelines for significant digits and rounding established in Practice D6026, unless superseded by this standard.1.6.1 For purposes of comparing measured or calculated value(s) with specified limits, the measured or calculated value(s) shall be rounded to the nearest decimal or significant digits in the specified limits.1.6.2 The procedures used to specify how data are collected/recorded or calculated in this standard are regarded as the industry standard. In addition, they are representative of the significant digits that generally should be retained. The procedures used do not consider material variation, the purpose for obtaining the data, special purpose studies, or any considerations for the user’s objectives; and it is common practice to increase or reduce significant digits of reported data to be commensurate with these considerations. It is beyond the scope of this standard to consider significant digits used in analytical methods for engineering design.1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.1.8 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价： 590元 / 折扣价： 502 元 加购物车

5.1 This test method is used to evaluate automotive manual transmission fluids for thermal instability, which results in deterioration of synchronizer performance.5.2 This test method may also be utilized in other specifications and classifications of transmission and gear lubricants such as the following:5.2.1 (final API designation of PG-1),5.2.2 Military Specification MIL-L-2105,5.2.3 SAE Information Report J308 Axle and Manual Transmission Lubricants, and5.2.4 Mack Truck GO-H Gear Lubricant Specification.1.1 This test method covers the thermal stability of fluids for use in heavy duty manual transmissions when operated at high temperatures.1.2 The lubricant performance is measured by the number of shifting cycles that can be performed without failure of synchronization when the transmission is operated while continuously cycling between high and low range.1.3 Correlation of test results with truck transmission service has not been established. However, the procedure has been shown to appropriately separate two transmission lubricants, which have shown satisfactory and unsatisfactory field performance in the trucks of one manufacturer.1.4 Changes in this test method may be necessary due to refinements in the procedure, obsolescence of parts, or reagents, and so forth. These changes will be incorporated by Information Letters issued by the ASTM Test Monitoring Center (TMC). The test method will be revised to show the content of all the letters, as issued.1.5 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.1.5.1 Exception—When materials, products, or equipment are available only in inch-pound units, SI units are omitted.1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.1.7 This test method is arranged as follows:  Section  1Referenced Documents  2Terminology  3Summary of Test Method  4  5Apparatus  6 Test Transmission  6.2 Transmission Mounts  6.3 Oil-Circulating System  6.4 Oil Return Hole  6.5 Air Pressure Controls  6.6 Drive System  6.7 Instrumentation  6.8 Thermocouple Placement  6.9Reagents and Materials  7Safety  8Preparation of Apparatus  9 Cleaning of Parts  9.1 Assembly  9.2Calibration  10 Transmission and Test Stand Calibration  10.1 Reference Oils  10.2 Reference Oil Test Frequency  10.3 Instrumentation Calibration  10.4 Shift Time Calibration  10.5Operating Procedure  11 System Flush and Charge  11.1 Test Operation  11.2 Shut-Down Procedure  11.3 Transmission Disassembly  11.4Determination of Test Results  12 Failure Criteria  12.1 Shifter Fork Wear  12.2 Test Validity Determination  12.3Report  13Precision and Bias  14Keywords  15Test Validity Calculations and Limits Annex A5HTCT Test Report Forms and Data Dictionary Annex A6Manual Transmission Cyclic Durability Test Parts Inspection and Wear Measurements Annex A71.8 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价： 646元 / 折扣价： 550 元 加购物车

5.1 This test method is designed to measure the chemical cure of the binder used in the manufacture of cork compositions. The results of this test method can be used only as a guide for its intended service in elevated temperature and environmental conditions.1.1 This test method covers three procedures for determination of the binder durability of cork-containing materials.1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.1.3 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价： 515元 / 折扣价： 438 元 加购物车

4.1 The procedure described in this test method is intended to determine the effects of freezing and thawing on SRW and related units in the presence of potable tap water or saline solution.4.2 The procedure is not intended to provide a quantitative measure to determine an expected length of service for a specific type of concrete unit.NOTE 2: The testing laboratory performing this test method should be evaluated in accordance with Practice C1093.1.1 This test method covers the resistance to freezing and thawing of dry-cast segmental retaining wall (SRW) units (see Specification C1372) and related concrete units. Units are tested in a test solution that is either potable tap water or 3 % saline solution depending on the intended use of the units in actual service.NOTE 1: Related concrete units include units such as hollow and solid concrete masonry units, concrete brick, and concrete roof pavers.1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with this standard. Some values have only SI units because the inch-pound equivalents are not used in practice.1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价： 590元 / 折扣价： 502 元 加购物车

4.1 This test method describes the procedure to evaluate or compare, or both, the durability of sealants when subjected to accelerated weathering and cyclic movement in a joint.4.2 Sealant installation procedures, design considerations and movement during cure affect the aging processes and are fundamental to the success of any sealant. These factors are not addressed with this test method.4.3 The amount, type and frequency of movement a sealant experiences during its lifetime strongly depends on the materials used in construction and on the orientation of the joint toward sunlight and many other factors that are not uniform or consistent.4.4 Climatic exposures will differ with the orientation of the building and shading as well as with local and regional climatic conditions. Climates in a given location can vary from year to year because of differences in solar radiation, temperature, rainfall, and atmospheric conditions. Further, the quality and intensity of solar radiation on the earth's surface varies with geographic location, season, time of day, and cloud cover.4.5 Variations in results may be expected when operating conditions are varied within the accepted limits of this test method. Therefore, all test results using this test method must be accompanied by a report of the specific operating conditions as required in Section 11. Refer to Practice G151 for detailed information on the caveats applicable to use of results obtained according to this test method.4.6 The results of laboratory exposure cannot be directly extrapolated to estimate an absolute rate of deterioration caused by natural weathering because the acceleration factor is material dependent and can be significantly different for each material and for different formulations of the same material. However, exposure of a similar material of known outdoor performance, a control, along with the test specimens allows comparison of the durability relative to that of the control under the test conditions. Evaluation in terms of relative durability also greatly improves the agreement in test results among different laboratories.4.7 Results of this procedure will depend on the care that is taken to operate the equipment according to Practices G154 and G155. Significant factors include regulation of the line voltage, freedom from salt or other deposits from water, temperature control, humidity control, where applicable, condition and age of the burners and filters in xenon arc equipment, and age of lamps in fluorescent UV equipment.NOTE 1: Additional information on sources of variability and on strategies for addressing variability in the design, execution and data analysis of laboratory accelerated exposure tests is found in Guide G141.1.1 This test method covers the method for the determination of the durability of a sealant based on its ability to function in cyclic movement maintaining adhesion and cohesion after repeated exposure to laboratory accelerated weathering procedures.1.2 This test method describes two laboratory accelerated weathering procedures for evaluating the durability of a sealant.1.3 RILEM TC139–DBS is related to this test method.1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价： 590元 / 折扣价： 502 元 加购物车

5.1 This test method uses elevated temperature in an attempt to accelerate the degradation of a sealant and its adhesion to a substrate. This test method is an accelerated method and will only be a predictor of long-term durability if the actual service temperature is significantly lower than the elevated test temperature.5.2 This test method can be used as an indicator of longevity but direct correlation to actual use will be difficult for many applications.5.3 The correlation of data from this test method to applications where the sealant joint will have wet and dry cycles will be difficult since, with some sealants on some substrates, adhesion that is lost during wet periods is regained during dry periods.5.4 This test method is performed in a hot liquid and may be considered an acceleration of deterioration of the sealant or the sealant's adhesion to a substrate. Compared to how the sealant will be used in some applications, in some cases, this test may be less severe than the actual application. The benefit from the use of this test method will depend on the comparison of the conditions of this test to the actual conditions of use (temperature, duration, nature of substrate, composition of the liquid).5.5 To determine the ability of a sealant to perform in a given application; modification of this procedure will often be required and is permissible, as mutually agreed upon by interested parties.1.1 This test method covers a laboratory procedure that assists in determining the durability of a sealant and its adhesion to a substrate while continuously immersed in a liquid. This method tests the influence of a liquid on the sealant and its adhesion to a substrate. It does not test the added influence of constant stress from hydrostatic pressure that is often present with sealants used in submerged and below-grade applications, nor does it test the added influence of stress from joint movement while immersed. This method also does not (in its standard form) test the added influence of acids or caustics or other materials that may be in the liquid, in many applications.1.2 The values stated in SI units are to be regarded as the standard. The inch-pound given in parentheses are provided for information only.1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价： 515元 / 折扣价： 438 元 加购物车

1. Scope 1.1 This Guideline considers the agents and mechanisms related to durability and provides advice for incorporating requirements for durability into the design, operation, and maintenance provisions for buildings and their components. 1.2 T

定价： 774元 / 折扣价： 658 元

4.1 This guide and the use of consensus performance standards for housing can significantly contribute to the removal of barriers to the acceptance of housing innovation in the global marketplace. This guide in conjunction with the balance of the set of standard guides, when complete, can also serve to improve communications between producers and consumers leading to enhanced quality and performance of housing.4.2 This guide is not intended for use in specifying and evaluating residential construction other than single family attached and detached dwellings. Nevertheless, some performance statements may have application to assessing the durability of building materials, components, and systems used in other constructions.4.3 Although this guide addresses site planning as it affects the durability of single family attached and detached dwellings, the site-planning issues considered are not to be construed as a comprehensive site specification.4.4 This guide can be useful to managers of housing procurement projects, home builders, designers, product manufacturers, and evaluation services in addressing durability issues related to single family attached and detached dwellings. Such applications can require that the performance statement examples be written in mandatory language.4.5 The performance statement examples given in this guide are intended to complement the durability requirements implied in prescriptive provisions of codes such as the International Residential Code for One- and Two-Family Dwellings (IRC).4.6 Limitations on Performance Prediction:4.6.1 The traditional approach to evaluating the durability in building materials, components, and systems has been related to specific materials, and their reaction over time to specific degradation factors. This is useful for establishing standards for the quality control and use of specific materials. However, it is not much help in making comparisons across a variety of traditional materials intended for the same use, in evaluating systems comprised of a number of specific materials (for example, walls), or in developing performance specifications and performance standards needed for innovative materials. Little research has considered the generic analysis of degradation factors acting upon building elements in residential application. Moreover, insufficient work has been done in the development of accelerated weathering tests in which the degradation processes simulate those occurring in practice. Also, much more material science studies of degradation mechanisms and rates are needed to form a strong foundation for performance prediction of building materials. For these reasons, the performance statements in this guide are examples and initial steps of an evolving process in developing performance standards for single family attached and detached dwellings. It is anticipated that, as this guide is applied to housing procurement projects and as more research into the subject of durability is carried out, the performance statement examples in this guide will change. Both providers and specifiers should consider the basis for modifications as performance statements are established.4.6.2 General conformance to this guide is intended to provide reasonable assurance that the in-place materials, built elements, and service subsystems of attached and detached dwellings will be serviceable through their service lives. Conformance to the performance statement examples in Appendix X3 does not assure that the service-lives will be met. Many of the listed tests are empirical in nature, and often do not reflect the variety of exposure conditions to which a material may be subjected in different geographic locations. However, the tests can be useful in illustrating comparisons of the performance of competing materials and systems. Paragraph X2.1.2.3 suggests that Practice E632 be followed in developing service-life prediction data when little performance history is available for a material or system.  1.1 This guide gives examples of performance statements for durable in-place materials, products, components, subsystems, and systems for single family attached and detached dwellings, considering the effects of normal degradation factors to which they are anticipated to be subjected over their service lives. Table 1 provides a listing of the sections of this Guide that address durability including the performance statements.TABLE 1 Sections of this Practice Addressing Durability 1.2 Damage from extreme acts of nature, vandalism, or intentional destructive acts by dwelling inhabitants are not considered as normal degradation factors affecting durability in this guide.Note 1—Performance statements regarding the performance of single family attached and detached dwellings under extreme acts of nature are addressed in the Guide on Structural Safety and Serviceability.1.3 This guide also addresses site planning in so far as it affects the durability of single family attached and detached dwellings.1.4 This guide is not intended to be used as a prescriptive regulatory document.1.5 The values stated in SI units are to be regarded as standard. The values given in parentheses are mathematical conversions to inch-pound units that are provided for information only and are not considered standard.

定价： 0元 / 折扣价： 0 元

1.1 This test method covers the determination of the relative durability of biomass fuel pellets by tumbling and sieve analysis.1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.1.3 This standard may involve hazardous materials, operations, and equipment. This standard does not purport to address all of the safety problems associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

定价： 0元 / 折扣价： 0 元

5.1 This practice is valuable in determining the resistance of flexible packaging materials to flex-formed pinholes. Conditioning levels A, B, or C are typically used. Reference Practice E171 and Guide F2097.5.2 Conditions D and E are typically used for determining the effect of flexing on barrier properties and transmission rates related to gas and/or moisture.5.3 This practice does not measure or condition materials for abrasion related to flex failure.5.4 Failures in the integrity of one or more of the plies of a multi-ply structure may require alternative testing. Supplementary permeation testing using gas or water vapor can be used in conjunction with the flex conditioning to measure the loss of ply integrity. Other test methods may be used after flexing for assessment of presence of pinholes. For a list of test methods, refer to Guide F2097.FIG. 1 Planar Evolution of Gelbo Shaft Helical Groove 30.70 mm [1.20 in.] Diameter Shaft5.4.1 The various conditions described in this practice are to prevent evaluating a material structure with an outcome of too many holes to effectively count (normally greater than 50), or too few to be significant (normally less than five per sample). Material structure, testing basis, and a mutual agreement with specified objectives are to be considered in the selection of conditioning level for testing.1.1 This practice covers conditioning of flexible barrier materials for the determination of flex resistance. Subsequent testing can be performed to determine the effects of flexing on material properties. These tests are beyond the scope of this practice.1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价： 515元 / 折扣价： 438 元 加购物车