定价： 78元 / 折扣价： 67 元

定价： 975元 / 折扣价： 829 元 加购物车

定价： 605元 / 折扣价： 515 元

定价： 553元 / 折扣价： 471 元 加购物车

定价： 1957元 / 折扣价： 1664 元 加购物车

定价： 975元 / 折扣价： 829 元 加购物车

定价： 78元 / 折扣价： 67 元 加购物车

5.1 The electrical properties of gate and field oxides are altered by ionizing radiation. The method for determining the dose delivered by the source irradiation is discussed in Practices E666, E668, E1249, and Guide E1894. The time dependent and dose rate effects of the ionizing radiation can be determined by comparing pre- and post-irradiation voltage shifts, ΔVot and ΔVit. This test method provides a means for evaluation of the ionizing radiation response of MOSFETs and isolation parasitic MOSFETs.5.2 The measured voltage shifts, ΔVot and ΔVit, can provide a measure of the effectiveness of processing variations on the ionizing radiation response.5.3 This technique can be used to monitor the total-dose response of a process technology.1.1 This test method covers the use of the subthreshold charge separation technique for analysis of ionizing radiation degradation of a gate dielectric in a metal-oxide-semiconductor-field-effect transistor (MOSFET) and an isolation dielectric in a parasitic MOSFET.2,3,4 The subthreshold technique is used to separate the ionizing radiation-induced inversion voltage shift, ΔVINV into voltage shifts due to oxide trapped charge, ΔVot and interface traps, ΔV it. This technique uses the pre- and post-irradiation drain to source current versus gate voltage characteristics in the MOSFET subthreshold region.1.2 Procedures are given for measuring the MOSFET subthreshold current-voltage characteristics and for the calculation of results.1.3 The application of this test method requires the MOSFET to have a substrate (body) contact.1.4 Both pre- and post-irradiation MOSFET subthreshold source or drain curves must follow an exponential dependence on gate voltage for a minimum of two decades of current.1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.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.

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5.1 The MIP system provides a timely and cost effective way for delineation of many VOC plumes (for example, gasoline, benzene, toluene, solvents, trichloroethylene, tetrachloroethylene) with depth (1, 2, 4, 8, 9). MIP detector logs provide insight into the relative contaminant concentration based upon the response magnitude of detector and a determination of compound class based upon which detectors of the series respond of the bulk VOC distribution in the subsurface but do not provide analyte specificity (1, 2, 7). DP logging tools such as the MIP are often used to perform expedited site characterizations (10, 11, D5730) and develop detailed conceptual site models (E1689). The project manager should determine if the required data quality objectives (D5792) can be achieved with a MIP investigation. MIP logging is typically one part of an overall investigation program.5.2 MIP logs provide a detailed record of VOC distribution in the saturated and unsaturated formations and assist in evaluating the approximate limits of potential contaminants. A proportion of the halogenated and non-halogenated VOCs in the sorbed, aqueous, or gaseous phases partition through the membrane for detection up hole (1).5.3 Many factors influence the movement of volatile compounds from the formation across the membrane and into the carrier gas stream. One study has evaluated the effects of temperature and pressure at the face of the membrane on analyte permeability (12). Formation factors such as degree of saturation, clay content, proportion of organic carbon, porosity and permeability will also influence the efficiency of analyte movement from the formation across the membrane. Of course, the volatility, concentration, molecular size and mass, and water solubility of each specific VOC will influence movement across the membrane and rate of transport through the carrier gas line to the detectors.5.4 High analyte concentrations or the presence of Non-Aqueous Phase Liquid (NAPL) in the formation can result in analyte carry over in the MIP log (8, 13). This is a result of high analyte concentrations within the membrane matrix requiring time to diffuse out of the membrane into the carrier gas stream. This effect can lead to tailing of detector peaks on the MIP log to deeper intervals. Use of appropriate detectors and detector sensitivity settings can reduce this effect (14). Experience with log interpretation also helps to identify analyte carryover. Of course, targeted soil or groundwater sampling (D6001, D6282) should be performed routinely to verify log results and assist with log interpretation and site characterization (subsection 1.4).5.5 Some volatile contaminants are composed of multiple analytes of different molecular mass, size and volatility (e.g. gasoline). A detailed study was performed using a gas chromatograph (GC)-mass spectrometer system to assess the delay in movement of several components of gasoline from the membrane face, up the trunkline, to the MIP detectors (15). The larger, more massive analytes were found to be delayed in reaching the detectors. This effect means that some analyte mass will be graphed on the MIP log at a depth below where it entered the membrane. This “dispersion” effect is difficult to overcome. However, knowledge of the site-specific analyte(s) and experience with log interpretation can help the user assess these effects on log quality and contaminant distribution. Of course, targeted soil or groundwater sampling (D6001, D6282) should be performed routinely to verify log results and assist with log interpretation and site characterization (subsection 1.4).5.6 One of the important benefits of MIP logging is that the number of samples and laboratory analyses required to effectively characterize a VOC plume and source area can be greatly reduced, thus reducing investigative time and costs. Reduction of the number of samples required also reduces site worker exposure to hazardous contaminants. The data obtained from the MIP logs may be used to guide and target soil (D6282) and groundwater sampling (D6001) and the placement of long-term monitoring wells (D6724, D6725, D5092) (2, 7, 8) to more effectively characterize and monitor site conditions.5.7 Typically, only VOCs are detected by the MIP system in the subsurface. Use of specialized methods and/or detector systems may allow for detection of other gaseous or volatile contaminants (for example, mercury). Detection limits are subject to the selectivity and sensitivity of the gas phase detectors applied, the analytes encountered, and characteristics of the formation being penetrated (for example permeability, saturation, sand, clay and organic carbon content).5.8 Correlation of a series of MIP logs across a site can provide 2-D and 3-D definition of the of the primary VOC contaminant plume (7, 8). When lithologic logs such as EC, HPT, or CPT are obtained with the MIP data, contaminant migration pathways (7, 8) as well as storage and back diffusion zones (16) may be defined.5.9 Some investigations (8, 17-21) have found the MIP can be effective in locating zones where dense nonaqueous phase liquids (DNAPL) may be present. However, under some conditions, especially when inappropriate detectors and methods are used (22, 23), analyte carryover (15) can mask the bottom of the DNAPL body (9, 13, 24). These limitations can be minimized by use of appropriate methods and detectors (14, 23).5.10 While the conventional MIP system does not provide quantitative data or analyte specificity some researchers have modified the system with different sampling or detector systems in attempts to achieve quantitation and specificity (21, 25, 26). These methods typically reduce the speed of the logging process in order to provide improved quantitation and analyte specificity for a limited group of analytes.5.11 MIP data can be used to optimize site remediation by knowing the vertical and horizontal distribution of VOCs as well as obtaining information on the soil type and permeability where contaminants are held by using tandem lithologic sensors such as EC, HPT, or CPT. For example, materials injected for remediation are placed at correct depths in the formation based upon the detector responses of contaminants and the proper type of injection is performed based upon the formation permeability.5.11.1 This practice also may be used as a means of evaluating remediation performance. MIP can provide a cost-effective way to evaluate the progress of VOC remediation. When properly performed at suitable sites, logging locations can be compared from the initial pre-remedial investigation to logs of the VOC contaminants after remediation is initiated.NOTE 1: The quality of the result produced by this standard is dependent on the competence of the personnel performing it, and the suitability of the equipment and facilities used. Practitioners 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 evaluating some of those factors. Practice D3740 was developed for agencies engaged in the testing and/or inspection of soils and rock. As such, it is not totally applicable to agencies performing this practice. However, users of this practice should recognize that the framework of Practice D3740 is appropriate for evaluating the quality of an agency performing this practice. Currently there is no known qualifying national authority that inspects agencies that perform this practice.1.1 This standard practice describes a field procedure for the rapid delineation of volatile organic compounds (VOC) in the subsurface using a membrane interface probe. Logging with the membrane interface probe is usually performed with direct push (DP) equipment. DP methods are typically used in soils and unconsolidated formations, not competent rock.1.2 This standard practice describes how to obtain a real time vertical log of VOCs with depth. The data obtained is indicative of the total VOC level in the subsurface at depth. The MIP detector responses provide insight into the relative contaminant concentration based upon the magnitude of detector responses and a determination of compound class based upon which detectors of the series respond.1.3 The use of a lithologic logging tool is highly recommended to define hydrostratigraphic conditions, such as migration pathways, and to guide confirmation sampling and remediation efforts. Other sensors, such as electrical conductivity, hydraulic profiling tool, fluorescence detectors, and cone penetration tools may be included to provide additional information.1.4 Since MIP results are not quantitative, soil and water sampling (Guides D6001, D6282, D6724, and Practice D6725) methods are needed to identify specific analytes and exact concentrations. MIP detection limits are subject to the selectivity of the gas phase detector applied and characteristics of the formation being penetrated (for example: permeability, saturation, clay and organic carbon content).1.5 The values stated in either SI units or inch-pound units [given 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. Reporting of test results in units other than SI shall not be regarded as nonconformance with this standard.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 The procedures used to specify how data is collected/recorded and calculated in the 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 these test methods to consider significant digits used in analytical methods for engineering data.1.7 This practice offers a set of instructions for performing one or more specific operations. This document cannot replace education or experience and should be used in conjunction with professional judgment. Not all aspects of this practice may be applicable in all circumstances. This ASTM standard is not intended to represent or replace the standard of care by which the adequacy of a given professional service must be judged, nor should this document be applied without the consideration of a project’s many unique aspects. The word “standard” in the title means that the document has been approved through the ASTM consensus process.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.

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1.1 This guide covers the manufacture of Weight Shift aircraft and their qualification for certification.1.2 This guide applies to Weight Shift Control aircraft seeking civil aviation authority approval, in the form of flight certificates, flight permits, or other like documentation.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 and health practices and determine the applicability of regulatory limitations prior to use.

定价： 515元 / 折扣价： 438 元 加购物车

This specification covers the male and female threaded connectors used to interface a propellant source to a paintball marker. The male connector shall incorporate a means for propellant shutoff that shall meet the maximum leakage requirement. When the male and female connectors are joined and pressurized, together they shall meet the maximum leakage specification. The male and female connector shall conform to the physical envelope described. The male connector may contain, as a means of propellant shutoff, a valve core to provide for an automatic shutoff of flow at the time of disconnection. The female connector shall have a provision for the self venting of residual gas pressure prior to the disconnection of the threaded interface.1.1 This specification covers the male and female threaded connectors used to interface a propellant source with a normal working output pressure of 10 342 kPa (1800 psig) or less to a paintball marker.1.2 The values stated in SI units are to be regarded as standard. The values given in parentheses are 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

5.1 This test method will be used by athletic footwear manufacturers to characterize the traction of the athletic shoe-sports surface interface, and as a tool for development of athletic shoe outsoles.5.2 This test method will be used by researchers to determine the effect of sport surface conditions (for example, moisture, grass species, turf density, soil texture, soil composition, and so forth) on traction characteristics of the athletic shoe-sports surface interface.5.3 This test method will be used by sports surface manufacturers to characterize the traction of the athletic shoe-sports surface interface, and as a tool for development of sports surfaces.5.4 Careful adherence to the requirements and recommendations of this test method will provide results that compare with results from different laboratory sources.5.5 The method will be used to research relationships between traction at athletic shoe-sports surface interfaces and athletic performance or injury. This research may lead to recommendations for appropriate levels of traction.1.1 This test method covers specifications for the performance of sports shoe-surface traction measuring devices, but does not require a specific device or mechanism to be used. Figs. 1 and 2 show schematic diagrams of generic apparatus.FIG. 1 Schematic Diagram of a Generic Device for Measuring Linear TractionA. Shoe under test, mounted on a footform.B. Surface under test.C. Guide rails with linear bearings or other means of maintaining rectilinear motion.D, E. Vertical shaft and bearing mounted carriage or other means of maintaining motion parallel to the plane of the shoe-surface interface.F. Weights, actuator or other means of applying a downward vertical force.G. Actuator or other means of applying a horizontal force.H. Force plate or other means of measuring vertical and horizontal forces.J. Velocity transducer.FIG. 2 Schematic Diagram of a Generic Device for Measuring Rotational TractionA. Shoe under test, mounted on a footform.B. Surface under test.D, E. Vertical shaft and bearings or other means of constraining rotation about the vertical axis parallel to the plane of the shoe-surface interface.F. Weights, actuator or other means of applying a downward vertical force.G. Actuator or other means of applying a torque.H. Force plate or other means of measuring vertical force and torque about the vertical axis.J. Angular velocity transducer.1.2 This test method is appropriate for measuring the effects of athletic shoe outsole design and materials on traction at the shoe-surface interface.1.3 This test method is appropriate for measuring the effects of sport surface design and materials on traction at the shoe-surface interface.1.4 This test method specifies test procedures that are appropriate for both field and laboratory testing.1.5 Traction characteristics measured by this test method encompass friction forces developed between shoe outsoles and playing surfaces.1.6 Traction characteristics measured by this test method encompass traction achieved by penetration of cleats or studs into playing surfaces.1.7 This test method specifies test procedures for the measurement of traction during linear translational motion and rotational motion, but not simultaneous combinations of linear and translational motion.1.8 The loads and load rates specified in this test method are specific to sports activities. The test method is not intended for measurement of slip resistance or traction of pedestrian footwear.1.9 Test results obtained by this method shall be qualified by the characteristics of the specimen.1.9.1 Comparative tests of surfaces shall be qualified by the characteristics of the shoes used to test the surfaces, including the cushioning, outsole material, and sole design.1.9.2 Comparative tests of shoes shall be qualified by the pertinent characteristics of the surfaces on which shoes are tested, including the surface type, material, condition, and temperature.1.10 This test method does not establish performance or safety criteria. The level of traction required between a sport shoe and surface varies with the level of performance and from individual to individual. The extent to which particular levels of traction contribute to individual athletic performance and risk of injury is not known.1.11 The values stated in SI units are to be regarded as the standard.1.12 This standard may involve hazardous materials, operations and equipment. 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.1.13 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 international standards for the crew interface aspects of airworthiness and design for aircraft. The applicant for a design approval must seek the individual guidance of their respective civil aviation authority (CAA) body concerning the use of this specification as part of a certification plan.The standards address pilot/occupant compartment; flight control systems controls; cockpit controls; motion and effect of cockpit controls; cockpit control knob shape; circuit breakers and fuses; master switch arrangement; flight control augmentation and auto flight system; primary flight information displays; primary flight guidance; and communication and audio systems. Also covered in this specification are pilot alerts; warning, caution, and advisory lights or indicators; continued airworthiness and maintenance; markings and placards; and airplane flight manual and approved manual material.1.1 This specification covers international standards for the crew interface aspects of airworthiness and design for aircraft. “Crew” includes flight crew and maintenance crew. The material was developed through open consensus of international experts in general aviation. This information was created by focusing on Normal Category aeroplanes. The content may be more broadly applicable; it is the responsibility of the applicant to substantiate broader applicability as a specific means of compliance.1.2 An applicant intending to propose this information as Means of Compliance for a design approval must seek guidance from their respective oversight authority (for example, published guidance from applicable CAAs) concerning the acceptable use and application thereof. For information on which oversight authorities have accepted this specification (in whole or in part) as an acceptable Means of Compliance to their regulatory requirements (hereinafter “the Rules”), refer to ASTM Committee F44 web page (https://www.astm.org/COMMITTEE/F44.htm).1.3 Units—This document may present information in either SI units, English Engineering units, or both. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined.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： 646元 / 折扣价： 550 元 加购物车

This specification describes the Laboratory Equipment Control Interface Specification (LECIS). This is a set of standard equipment behaviors that must be accessible under remote control to set up and operate laboratory equipment in an automated laboratory. Discussed intensively herein are the equipment requirements, notations and general message syntaxes, control paradigms, message transactions, communication maintenance and locus of control, operational management, sample loading and processing, and error and exception handling.1.1 This specification covers deterministic remote control of laboratory equipment in an automated laboratory. The labor-intensive process of integrating different equipment into an automated system is a primary problem in laboratory automation today. Hardware and software standards are needed to facilitate equipment integration thereby significantly reduce the cost and effort to develop fully automated laboratories.1.2 This Laboratory Equipment Control Interface Specification (LECIS) describes a set of standard equipment behaviors that must be accessible under remote control to set up and operate laboratory equipment in an automated laboratory. The remote control of the standard behaviors is defined as standard interactions that define the dialogue between the equipment and the control system that is necessary to coordinate operation. The interactions are described with state models in which individual states are defined for specific, discrete equipment behaviors. The interactions are designed to be independent of both the equipment and its function. Standard message exchanges are defined independently of any specific physical communication links or protocols for messages passing between the control system and the equipment.1.3 This specification is derived from the General Equipment Interface Definition developed by the Intelligent Systems and Robotics Center at Sandia National Laboratory, the National Institute of Standards Technologies' Consortium on Automated Analytical Laboratory Systems (CAALS) High-Level Communication Protocol, the CAALS Common Command Set, and the NISTIR 6294 (1-4). This LECIS specification was written, implemented, and tested by the Robotics and Automation Group at Los Alamos National Laboratory.1.4 Equipment Requirements-LECIS defines the remote control from a Task Sequence Controller (TSC) of devices exhibiting standard behaviors of laboratory equipment that meet the NIST CAALS requirements for Standard Laboratory Modules (SLMs) (5). These requirements are described in detail in Refs (3, 4). The requirements are:1.4.1 Predictable, deterministic behavior,1.4.2 Ability to be remotely controlled through a standard bidirectional communication link and protocol,1.4.3 Maintenance of remote communication even under local control,1.4.4 Single point of logical control,1.4.5 Universal unique identifier,1.4.6 Status information available at all times,1.4.7 Use of appropriate standards including the standard message exchange in this LECIS,1.4.8 Autonomy in operation (asynchronous operation with the TSC),1.4.9 Perturbation handling,1.4.10 Resource management1.4.11 Buffered inputs an outputs,1.4.12 Automated access to material ports,1.4.13 Exception monitoring and reporting,1.4.14 Data exchange via robust protocol,1.4.15 Fail-safe operation,1.4.16 Programmable configurations (for example, I/O ports),1.4.17 Independent power-up order, and1.4.18 Safe start-up behavior.

定价： 0元 / 折扣价： 0 元

5.1 The procedure described in this test method for determination of the shear resistance for the GCL or the GCL interface is intended as a performance test to provide the user with a set of design values for the test conditions examined. The test specimens and conditions, including normal stresses, are generally selected by the user.5.2 This test method may be used for acceptance testing of commercial shipments of GCLs, but caution is advised as outlined in 5.2.1.5.2.1 The shear resistance can be expressed only in terms of actual test conditions (see Notes 2 and 3). The determined value may be a function of the applied normal stress, material characteristics (for example, of the geosynthetic), soil properties, size of sample, moisture content, drainage conditions, displacement rate, magnitude of displacement, and other parameters.NOTE 2: In the case of acceptance testing requiring the use of soil, the user must furnish the soil sample, soil parameters, and direct shear test parameters. The method of test data interpretation for purposes of acceptance should be mutually agreed to by the users of this standard.NOTE 3: Testing under this test method should be performed by laboratories qualified in the direct shear testing of soils and meeting the requirements of Practice D3740, especially since the test results may depend on site-specific and test conditions.5.2.2 This test method measures the total resistance to shear within a GCL or between a GCL and adjacent material. The total shear resistance may be a combination of sliding, rolling, and interlocking of material components.5.2.3 This test method does not distinguish between individual mechanisms, which may be a function of the soil and GCL used, method of material placement and hydration, normal and shear stresses applied, means used to hold the GCL in place, rate of horizontal displacement, and other factors. Every effort should be made to identify, as closely as is practicable, the sheared area and failure mode of the specimen. Care should be taken, including close visual inspection of the specimen after testing, to ensure that the testing conditions are representative of those being investigated.5.2.4 Information on precision between laboratories is incomplete. In cases of dispute, comparative tests to determine whether a statistical bias exists between laboratories may be advisable.5.3 The test results can be used in the design of GCL applications, including but not limited to, the design of liners and caps for landfills, cutoffs for dams, and other hydraulic barriers.5.4 The displacement at which peak strength and post-peak strength occur and the shape of the shear stress versus shear displacement curve may differ considerably from one test device to another due to differences in specimen mounting, gripping surfaces, and material preparation. The user of results from this standard is cautioned that results at a specified displacement may not be reproducible across laboratories and that the relative horizontal displacement measured in this test at peak strength may not match relative shear displacement at peak strength in a field condition.1.1 This test method covers a procedure for determining the internal shear resistance of a geosynthetic clay liner (GCL) or the interface shear resistance between the GCL and an adjacent material under a constant rate of deformation.1.2 This test method is intended to indicate the performance of the selected specimen by attempting to model certain field conditions.1.3 This test method is applicable to all GCLs. Remolded or undisturbed soil samples can be used in the test device. See Test Method D5321/D5321M for interface shear testing of non-GCL geosynthetics. See Guide D7702/D7702M for a summary of available information related to the evaluation of direct shear results obtained using this test method.1.4 This test method is not suited for the development of exact stress-strain relationships within the test specimen due to the nonuniform distribution of shearing forces and displacement.1.5 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined.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： 646元 / 折扣价： 550 元 加购物车