定价： 1333元 / 折扣价： 1134 元 加购物车

定价： 1515元 / 折扣价： 1288 元 加购物车

定价： 260元 / 折扣价： 221 元 加购物车

定价： 1177元 / 折扣价： 1001 元

定价： 1177元 / 折扣价： 1001 元

This specification covers common laboratory or filter funnels, and filling or powder funnels for general laboratory use. The laboratory glass funnels shall be classified into four types which are divided into classes. Type 1 is common laboratory funnel with smooth inner surface which is divided into three classes: Class A with short stem, Class B with long stem, and Class C without stem. Type 2 is laboratory funnel with fluted inner wall. The flutes are small grooves or depressions running upward from the bottom zone of the bowl. This type is divided into Class A and Class B. Type 3 is laboratory funnel with ribbed inner wall. The ribs are small raised protuberances from funnel rim toward the stem. Class A and Class B funnels belong to this type. Type 4 is the last type which is filling or powder funnels. This type has short, wide diameter stem.1.1 This specification covers common laboratory or filter funnels, and filling or powder funnels for general laboratory use.1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.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

The current gain of a transistor is basic to its operation and is its single most important parameter. Ionizing radiation, that is, gamma radiation due to a nuclear burst, will degrade the current gain due to lifetime damage in the bulk material. Degradation of gain will be greatest immediately following a burst of ionizing radiation and the gain will rapidly recover to a quasi steady-state value. Defect annealing may continue for weeks but usually the current gain recovery is small or negligible. This method provides a procedure that does not require special-purpose test equipment. This method is suitable for use for specification acceptance, service evaluation, or manufacturing control.1.1 This test method covers the measurement of common-emitter d-c current gain (forward, hFE, or inverted, hFEI) of bipolar transistors, for which the collector-emitter leakage current, ICEO, is less than 10% of the collector current, IC, at which the measurement is to be made, and for which the shunt leakage current in the base circuit is less than 10% of the base current required. 1.2 This test method is suitable for measurement of common-emitter d-c current gain at a single given value of test transistor collector current or over a given range of collector currents (for example, over the range of the transistor to be tested). 1.2.1 The nominal ranges of collector current over which the three test circuits are intended to be used are as follows: 1.2.1.1 Circuit 1, less than 100 [mu]A, 1.2.1.2 Circuit 2, from 100 [mu]A to 100 mA, and 1.2.1.3 Circuit 3, greater than 100 mA. 1.3 This test method incorporates tests to determine if the power dissipated in the transistor is low enough that the temperature of the junction is approximately the same as the ambient temperature. 1.4 The values stated in International System of Units (SI) are to be regarded as standard. No other units of measurement are included in this standard. 1.5 This standard does not purport to address the safety problems, if any, associated with its use. It is the responsibility of whoever uses this standard to consult and 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

This specification covers a group of requirements that are mandatory for castings produced by the investment casting process to meet the metallurgical requirements of the following steel casting specifications. Chemical, heat, and product analyses shall be performed wherein the material shall meet the specified composition limits for carbon, manganese, silicon, phosphorus, sulfur, nickel, chromium, molybdenum, vanadium, tungsten, copper, and aluminum. The specified design and dimensions of the ICI test bar shall be employed only for austenitic alloy castings. The material shall conform to mechanical properties including tension test requirements.1.1 This specification covers a group of requirements that are mandatory for castings produced by the investment casting process to meet the metallurgical requirements of the following steel casting specifications issued by ASTM.ASTM Designation Title of SpecificationA27/A27M Steel Castings, Carbon, for General ApplicationA128/A128M Steel Castings, Austenitic ManganeseA148/A148M Steel Castings, High-Strength, for Structural PurposesA297/A297M Steel Castings, Iron-Chromium and Iron-Chromium-Nickel, Heat-Resistant, for General ApplicationA447/A447M Steel Castings, Chromium-Nickel-Iron Alloy (25-12 Class), for High-Temperature ServiceA494/A494M Castings, Nickel and Nickel AlloyA560/A560M Castings, Chromium-Nickel AlloyA732/A732M Castings, Investment, Carbon and Low-Alloy Steel for General Application, and Cobalt Alloy for High Strength at Elevated TemperaturesA743/A743M Castings, Iron-Chromium, Iron-Chromium-Nickel, Corrosion-Resistant, for General ApplicationA744/A744M Castings, Iron-Chromium-Nickel, Corrosion Resistant, for Severe ServiceA747/A747M Steel Castings, Stainless, Precipitation HardeningA890/A890M Castings, Iron-Chromium-Nickel-Molybdenum Corrosion-Resistant, Duplex (Austenitic/Ferritic) for General ApplicationA915/A915M Steel Castings, Carbon and Alloy, Chemical Requirements Similar to Standard Wrought GradesA958/A958M Steel Castings, Carbon and Alloy, with Tensile Requirements, Chemical Requirements Similar to Standard Wrought GradesA1002 Castings, Nickel-Aluminum Ordered Alloy1.2 This specification also covers a group of supplementary requirements that may be applied to the above specifications as indicated therein. These are provided for use when additional testing or inspection is desired, and apply only when specified individually by the purchaser in the order.1.3 When investment castings are ordered, the requirements stated in this specification form an integral part of the material specification. In cases of conflict, the requirements of this specification shall take precedence over the individual material specification requirements.1.4 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 nonconformance with the standard.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

This specification covers the common requirements that shall apply to wrought steel piping fittings. The material shall consist of forgings, bars, plates, and seamless or welded tubular products. Ferritic steels shall be fully killed. Hollow cylindrically shaped parts up to and including NPS 4 may be machined from bar or seamless tubular material. Elbows, return bends, tees, and header tees shall not be machined directly from bar stock. The following procedures shall be done for heat treatment: full annealing, solution annealing, isothermal annealing, normalizing, tempering and post-weld heat treatment, stress relieving, and quench and temper. Chemical analysis, heat analysis, and product analysis shall also be done. The chemical requirements shall conform to the required compositions of carbon, manganese, phosphorus, sulfur, silicon, nickel, chromium, molybdenum, vanadium, columbium, titanium, aluminum, lead, and copper. The following tests shall be done for the mechanical requirements: tension, hardness, impact, and hydrostatic tests.1.1 This specification covers a group of common requirements that shall apply to wrought steel piping fittings covered in any of the following individual product specifications or any other ASTM specification that invokes this specification or portions thereof:Title of Specification ASTMDesignationSpecification for Piping Fittings of Wrought  Carbon Steel and Alloy Steel for Moderate and  High Temperature Service A234/A234MSpecification for Wrought Austenitic Stainless  Steel Piping Fittings A403/A403MSpecification for Piping Fittings of Wrought Carbon  Steel and Alloy Steel for Low-Temperature Service A420/A420MSpecification for Wrought-Carbon Steel Butt-Welding  Piping Fittings with Improved Notch Toughness A758/A758MSpecification for As-Welded Wrought Austenitic  Stainless Steel Fittings for General Corrosive  Service at Low and Moderate Temperatures A774/A774MSpecification for Wrought Ferritic, Ferritic/Austenitic,  and Martensitic Stainless Steel Piping Fittings A815/A815MSpecification for Heat-Treated Carbon Steel  Fittings for Low-Temperature and Corrosive Service A858/A858MSpecification for Wrought High-Strength  Ferritic Steel Butt-Welding Fittings A860/A860M1.2 In case of conflict between a requirement of the individual product specification and a requirement of this general requirement specification, the requirements of the individual product specification shall prevail over those of this specification.1.3 By mutual agreement between the purchaser and the supplier, additional requirements may be specified (See 4.1.8). The acceptance of any such additional requirements shall be dependent on negotiations with the supplier and must be included in the order as agreed upon by the purchaser and supplier.1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. Within the text and the tables, the SI units are shown in brackets. 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 specification. The inch-pound units shall apply unless the “M” designation [SI] of the product specification is specified in the order.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

3.1 This collection of test methods is used by pigment producers and paint manufacturers for process control, for product acceptance, and for research and development.1.1 These test methods cover procedures for determining certain properties of pigments. The procedures appear in the following order:Dry Pigments Sections Loss on Ignition and Ash  4Matter Soluble in Water  5Hydrogen Ion Concentration (pH Value)  6Alkalinity or Acidity by Titration 7 and 8Water Content (Distillation Method) 9 and 10 Pigment Pastes in Oil   Water Content (Distillation Method) 9 and 10Pigment Content of Paste in Oil 11Total Volatile Matter in Paste in Oil 121.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this 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

5.1 Modern offices and other multipurpose buildings commonly have suspended acoustical ceilings installed over room dividing partitions. The test facility prescribed in this test method is useful for providing ceiling attenuation data on the relevant ceiling/partition elements and systems, to ensure that the transmission of sound through the ceiling and plenum space, or through the combination of ceiling, plenum space, and partition systems, provides a suitable degree of acoustical isolation.5.2 This test method is useful for rating and specifying, under standardized conditions, the sound attenuation performance of ceiling materials when mounted in a specified suspension system.5.3 This test method may be useful for selecting a wall-ceiling system for probable compliance with a performance specification for overall sound isolation between rooms. However, the actual field performance may differ significantly, particularly if the field plenum depth is not within the limits specified in this test method or if the plenum space contains large ducts, beams, etc., or both. (See Test Method E336.)5.4 The flexibility inherent in the test facility enables evaluation of the effects of penetrations, induced leakage paths, luminaire, and air diffuser installations and discontinuities in the ceiling suspension system at the partition line, including penetration of the partition into the ceiling plenum. The effect of installing plenum barriers at the partition line may also be investigated.5.5 With the concentration of sound absorbent area offered by a suspended sound absorbent ceiling installed in a room, it is not possible to obtain a good approximation to a diffuse sound field in that room. The plenum dimensions prevent the maintenance of a diffuse sound field above the test specimen. These factors affect the values of the measured ceiling sound attenuation and thus the measurements are not a fundamental property of the ceiling. The test method measures the acoustical properties attainable under the prescribed test conditions, which have been arbitrarily selected. The conditions must be adhered to in every test facility so that the measured results will be consistent. Two methods for obtaining A, the receiving room absorption, are given without preference. One method, known as the steady state method, has been used to obtain an estimate for A in the AMA 1-II-1967 standard. The other method follows the procedures used in Test Methods E90 and C423; justification for the use of this method may be found in reference (1)5. Persons wishing to further investigate the limitations imposed by this test method are advised to read references (2), (3), (4) and (5).5.6 Notwithstanding the above limitations, this type of test method has been used successfully for a number of years to rank order commercial ceiling systems and the test results are commonly used for this purpose.1.1 This test method utilizes a laboratory space so arranged that it simulates a pair of horizontally adjacent small offices or rooms separated by a partition and sharing a common plenum space. The partition either extends to the underside of a common plenum space or penetrates through it. In the prescribed configuration, special design features of the facility ensure that the only significant sound transmission path is by way of the ceiling and the plenum space.1.2 Within the limitations outlined in the significance statement, the primary quantity measured by this test method is the ceiling attenuation of a suspended ceiling installed in a laboratory environment. By accounting for receiving room sound absorption, the normalized ceiling attenuation may be determined.1.3 The test method may also be used to evaluate the attenuation of composite ceiling systems comprised of the ceiling material and other components such as luminaires and ventilating systems.1.4 The field performance of a ceiling system may differ significantly from the results obtained by this test method (see Section 5, , and Test Method E336).1.5 The procedures may also be used to study the additional sound insulation that may be achieved by other attenuation measures. This would include materials used either as plenum barriers or as backing for all or part of the ceiling.1.6 The facility may also be used to study the performance of an integrated system comprising plenum, ceiling, and partition, tested as a single assembly.1.7 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.1.8 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.1.9 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

This specification covers a group of common requirements that shall apply to carbon, alloy, and stainless steel fasteners or fastener materials, or both. These materials are intended for use at any temperature from cryogenic to the creep range. Requirements for the melting process and quality control procedures for ingot cast and strand cast products are detailed. Bars and fasteners shall be produced in accordance with the product specification. The chemical composition, as to heat and product analyses, shall conform to the limits of the product specification. Bars, fasteners, bolting materials, and specimen machined from fasteners shall meet the mechanical requirements which shall be determined by the following tests: (1) proof load test by mandrel/tension or compression methods, (2) cone proof load test, (3) impact test, and (4) hardness test. Assembly for the proof load and cone proof tests are illustrated. The depth of decarburization shall be determined by metallographic etching and if needed, microhardness testing.1.1 This specification covers a group of common requirements that shall apply to carbon, alloy, stainless steel, and nickel alloy bolting under any of the following ASTM Specifications (or under any other ASTM Specifications that invoke this specification or portions thereof):Title of Specifications ASTM DesignationAlloy-Steel and Stainless Steel Bolting for High Temperature or High Pressure Service and Other Special Purpose Applications A193/A193MCarbon Steel, Alloy Steel, and Stainless Steel Nuts for Bolts for High Pressure or High Temperature Service, or Both A194/A194MAlloy-Steel and Stainless Steel Bolting for Low- Temperature Service A320/A320MStainless and Alloy-Steel Turbine-Type Bolting Specially Heat Treated for High-Temperature Service A437/A437MHigh-Temperature Bolting, with Expansion Coefficients Comparable to Austenitic Stainless Steels A453/A453MAlloy-Steel Bolting for Special Applications A540/A540MPrecipitation-Hardening Bolting (UNS  N07718) for High Temperature Service A1014/A1014MHigh Strength Precipitation Hardening and Duplex Stainless Steel Bolting for Special Purpose Applications A1082/A1082M1.2 In case of conflict, the requirements of the individual product specification shall prevail over those of this specification.1.3 Fasteners are a wide-ranging classification that includes screws, bolts, nuts, washers, stud bolts, rivets, powder-actuated studs, staples, tacks, and pins. Bolting, which is composed of bolting materials, such as rods, bars, flats, and forgings, which are subsequently manufactured into bolting components, are a special sub-group of fasteners. Bolting materials and components have designated compositions and specific properties intended for applications in aggressive service where commercial generic fasteners may not be suitable or have insufficient fitness for purpose under certain conditions. These conditions include cryogenic or high temperature service, or excessive vibration, impact, or shock. To further address any other special service conditions where bolting is intended for use, additional requirements may be specified by mutual agreement between the purchaser and supplier.1.4 Supplementary requirements are provided for use at the option of the purchaser. The supplementary requirements only apply when specified individually by the purchaser in the purchase order or contract.1.5 This specification is expressed in both inch-pound units and in SI units. Unless the purchase order or contract specifies the applicable “M” specification designation (SI units) the inch-pound units shall apply. The values stated in either SI units or inch-pound units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. 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 nonconformance with the specification.1.6 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

This specification covers a group of common requirements that shall apply to steel flanges, forged fittings, valves, and parts for piping applications. If the primary melting is required it shall incorporate separate degassing or refining and may be followed by secondary melting, such as electroslag remelting or vacuum remelting. If secondary melting is employed, the heat shall be defined as all of the ingot remelted from a single primary heat. Material requiring heat treatment shall be treated as specified in the individual product specification using the following procedures such as full annealing, solution annealing, isothermal annealing, normalizing, tempering and post-weld heat treatment, stress relieving. Heat analysis shall be used to determine the percentages of carbon, manganese, phosphorus, sulfur, silicon, chromium, nickel, molybdenum, titanium, tantalum, copper, cobalt, nitrogen, aluminum, vanadium, cerium to meet the required chemical composition. The product analysis shall be used to determine if the chemical composition shall conform to the limits of the product specified. Mechanical tests shall be performed to determine the mechanical properties such as hardness, tensile properties, and impact properties.1.1 This specification covers a group of common requirements that shall apply to steel flanges, forged fittings, valves, and parts for piping applications under any of the following individual product specifications:Title of Specification ASTM Designation   Forgings, Carbon Steel, for Piping Components A105/A105MForgings, Carbon Steel, for General-Purpose Piping A181/A181MForged or Rolled Alloy-Steel Pipe Flanges, Forged A182/A182M  Fittings, and Valves and Parts for High Temperature  Service  Forgings, Carbon and Low Alloy Steel, Requiring Notch A350/A350M  Toughness Testing for Piping Components  Forged or Rolled 8 and 9 % Nickel Alloy A522/A522M  Steel Flanges, Fittings, Valves, and Parts    for Low-Temperature Service  Forgings, Carbon and Alloy Steel, for Pipe Flanges, A694/A694M  Fittings, Valves, and Parts for High-Pressure  Transmission Service  Flanges, Forged, Carbon and Alloy Steel for Low A707/A707M  Temperature Service  Forgings, Carbon Steel, for Piping Components with A727/A727M  Inherent Notch Toughness  Forgings, Titanium-Stabilized Carbon Steel, for A836/A836M  Glass-Lined Piping and Pressure Vessel Service  1.2 In case of conflict between a requirement of the individual product specification and a requirement of this general requirement specification, the requirements of the individual product specification shall prevail over those of this specification.1.3 By mutual agreement between the purchaser and the supplier, additional requirements may be specified (see Section 4.1.2). The acceptance of any such additional requirements shall be dependent on negotiations with the supplier and must be included in the order as agreed upon between the purchaser and supplier.1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. Within the text and the tables, the SI units are shown in brackets. 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. The inch-pound units shall apply, unless the “M” designation (SI) of the product specification is specified in the order.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

This specification covers a group of common requirements that, unless covered by the individual product specification in another ASTM document, applies to steel and alloy castings for use in general industrial applications. Materials shall be produced by open-hearth or electric furnace process with or without separate refining, such as argon-oxygen-decarburization (AOD), and then consequently heat treated in the working zone. Castings shall receive heat and product analysis to evaluate their conformance to chemical composition requirements. Mechanical requirements shall also be assessed. The surfaces of castings shall be free of adhering sand, scale, cracks, hot tears, and other surface discontinuities. Repair welding may be performed as required.1.1 This specification covers a group of requirements that are mandatory requirements of the following steel casting specifications issued by ASTM. If the product specification specifies different requirements, the product specification shall prevail.ASTMDesignation  Title of SpecificationA27/A27M Steel Castings, Carbon, for General ApplicationA128/A128M Steel Castings, Austenitic ManganeseA148/A148M Steel Castings, High Strength, for Structural PurposesA297/A297M Steel Castings, Iron-Chromium and Iron-Chromium-Nickel, Heat Resistant, for General ApplicationA447/A447M Steel Castings, Chromium-Nickel-Iron Alloy (25-12 Class), for High-Temperature ServiceA494/A494M Castings, Nickel and Nickel AlloyA560/A560M Castings, Chromium-Nickel AlloyA743/A743M Castings, Iron-Chromium, Iron-Chromium-Nickel, Corrosion Resistant, for General ApplicationA744/A744M Castings, Iron-Chromium-Nickel, Corrosion Resistant, for Severe ServiceA747/A747M Steel Castings, Stainless, Precipitation HardeningA890/A890M Castings, Iron-Chromium-Nickel-Molybdenum Corrosion-Resistant, Duplex (Austenitic/Ferritic) for General ApplicationA915/A915M Steel Castings, Carbon and Alloy, Chemical Requirements Similar to Standard Wrought GradesA958/A958M Steel Castings, Carbon and Alloy, with Tensile Requirements, Chemical Requirements Similiar to Standard Wrought GradesA1002 Castings, Nickel-Aluminum Ordered Alloy1.2 This specification also covers a group of supplementary requirements that may be applied to the above specifications as indicated therein. These are provided for use when additional testing or inspection is desired and apply only when specified individually by the purchaser in the order.1.3 The requirements of the individual material specification and this general specification shall prevail in the sequence named.1.4 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 nonconformance with the standard.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： 646元 / 折扣价： 550 元 加购物车

1.1 This test method covers the determination of the particle-size distribution in the sub-sieve size range of the common extender pigments such as aluminum silicate (kaolin clay), magnesium silicate (talc), calcium carbonate (calcite or dolomite or precipitated calcium carbonate), and mica pigments, and may also be extended to the denser prime pigments such as the white titanium pigments (rutile or anatase) and similar mineral pigments when and if such information is of concern. Particle-size distribution has significance in the evaluation of rheological and pigmentary properties of pigments in paint and also may sometimes be used to characterize the identity or grade of pigments. 1.2 Sedimentation methods having as their basis Stoke's law have found general acceptance for this purpose. Results are expressed in terms of equivalent spherical diameter (e.s.d.), the diameter of a sphere having the same specific gravity as the particle in question and which settles at the same rate. Most mineral pigment particles are more-or-less asymmetrical, but despite differences in the relationship between equivalent spherical diameter and actual dimensions, the results of a sedimentation particle-size analysis can be correlated readily with many pigment properties. 1.3 Procedures limited to gravitational sedimentation are relatively inaccurate for pigment particles smaller than about 1 [mu]m e.s.d., and centrifugal procedures may be required for the much finer ranges. Nevertheless, the data obtained above the 1 [mu]m limitation provide useful information. This method is particularly applicable to pigments if a major fraction of the particles fall in the range from about 15 to 1.5 [mu]m, but have a total particle-size range of at least two decades. 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 and health practices and determine the applicability of regulatory limitations prior to use.

定价： 0元 / 折扣价： 0 元