定价： 19元 / 折扣价： 17 元 加购物车

本规程适用于准确度等级为00005级～01级的电阻型直流电位差计的首次检定，后续检定和使用中检验。
本规程不适用于：
a)自动获得零平衡的电位差计；
b)用平衡检测器刻度获得部分指示值的电位差计；
c)直流比较仪式电位差计；
d)其他特殊用途的电位差计。

定价： 39元 / 折扣价： 34 元 加购物车

This specification covers the standard requirements for hot-dip galvanized zinc coatings on iron and steel products made from rolled pressed and forged shapes, castings, plates, bars, and strips. This specification deals with both unfabricated products and fabricated products, for example, assembled steel products, structural steel fabrications, large tubes already bent or welded before galvanizing, and wire work fabricated from uncoated steel wire. Also covered here are steel forgings and iron castings incorporated into pieces fabricated before galvanizing or those too large to be centrifuged (or otherwise handled to remove excess galvanizing bath metal).1.1 This specification covers the requirements for zinc coating (galvanizing) by the hot-dip process on iron and steel products made from rolled pressed and forged shapes, castings, plates, bars, and strips.1.2 This specification covers both unfabricated products and fabricated products, for example, assembled steel products, structural steel fabrications, large tubes already bent or welded before galvanizing, and wire work fabricated from uncoated steel wire. This specification also covers steel forgings and iron castings incorporated into pieces fabricated before galvanizing or which are too large to be centrifuged (or otherwise handled to remove excess galvanizing bath metal).NOTE 1: This specification covers those products previously addressed in Specifications A123-78 and A386-78.1.3 This specification does not apply to wire, pipe, tube, or steel sheet which is galvanized on specialized or continuous lines, or to steel less than 22 gage (0.0299 in.) [0.76 mm] thick.1.4 The galvanizing of hardware items that are to be centrifuged or otherwise handled to remove excess zinc (such as bolts and similar threaded fasteners, castings and rolled, pressed and forged items) shall be in accordance with Specification A153/A153M.1.5 Fabricated reinforcing steel bar assemblies are covered by the present specification. The batch galvanizing of separate reinforcing steel bars shall be in accordance with Specification A767/A767M and the continuous galvanizing of reinforcing bars shall be in accordance with Specification A1094/A1094M.1.6 This specification is applicable to orders in either inch-pound units (as A123) or SI units (as A123M). Inch-pound units and SI units are not necessarily exact equivalents. Within the text of this specification and where appropriate, SI units are shown in parentheses. Each system shall be used independently of the other without combining values in any way. In the case of orders in SI units, all testing and inspection shall be done using the metric equivalent of the test or inspection method as appropriate. In the case of orders in SI units, such shall be stated to the galvanizer when the order is placed.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 加购物车

本标准规定了给水用钢骨架聚乙烯塑料复合管的术语和定义，原料，一般规定，要求，试验方法，检验规则，标志、包装、运输和贮存。
本标准适用于建筑物内外架空与埋地的给水用钢骨架聚乙烯塑料复合管。

定价： 24元 / 折扣价： 21 元 加购物车

本标准规定了海域使用的分类原则以及分类体系的划分。
本标准适用于海域使用权取得、登记、发证、海域使用金征缴、海域使用执法监察以及海籍调查、统计分析、海域使用论证、海域评估、海域管理信息系统建设等工作对海域使用类型和用海方式的界定。

定价： 21元 / 折扣价： 18 元 加购物车

本标准规定了热力生产和供应企业能源管理体系的认证要求。
本标准适用于热力生产和供应企业的能源管理体系认证，可用于热力生产和供应企业建立、实施、保持和改进其能源管理体系，也可作为各相关方评价热力生产和供应企业能源管理体系的依据。
热电联产企业的高温高压蒸汽生产和发电过程的能源管理活动，抽出汽机部分做功后的较低品质的蒸汽进入供热首站，通过汽水换热器换热，对外提供热力的管理活动适用于本标准。

定价： 43元 / 折扣价： 37 元 加购物车

定价： 590元 加购物车

本标准规定了连续缠绕焊接成型的网状钢丝骨架与聚乙烯(中密度或高密度)热塑性树脂，以挤出方式复合成型的钢骨架聚乙烯塑料复合管(以下简称复合管或SRPE)的原料、产品分类、要求、试验方法、检验规则和标志、包装、运输与贮存。
本标准适用于建筑物内外、架空与埋地的压力输水及饮用水用复合管，复合管长期使用时输送的介质温度不超过70℃，非长期使用时输送的介质温度不超过80℃。

定价： 28元 / 折扣价： 24 元 加购物车

本文件规定了家用和类似用途大通量反渗透净水机的型号命名、技术要求、试验方法、检验规则、标志、包装、使用说明、运输和贮存。本文件适用于出水流量不小于1.05 L/min（400 GAL/24 h）的家用和类似场所使用的反渗透净水机。

定价： 31元 / 折扣价： 27 元 加购物车

本标准规定了家用和类似用途饮用水处理装置用活性炭组件安全使用寿命评价的技术要求、试验方法。
本标准适用于家用和类似用途水质处理装置(不含中央净水和龙头式过滤装置)中使用的活性炭滤芯元件，本标准也适用于颗粒活性炭、碳棒以及碳纤维滤芯等活性炭类的组件。

定价： 19元 / 折扣价： 17 元 加购物车

4.1 This test method is used to determine conformance with provisions of Specification C33 pertaining to the amount of lightweight material in fine and coarse aggregates. A heavy liquid with a specific gravity of 2.0 is used to separate particles which may be classified as coal or lignite. Heavier liquids are to be used to check the percentages of other lightweight particles such as chert and shale having a specific gravity less than 2.40.4.2 The test method is useful in identifying porous aggregate particles in research activities or in petrographic analyses.1.1 This test method covers the determination of the percentage of lightweight particles in aggregate by means of sink-float separation in a heavy liquid of suitable specific gravity.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. Some values have only SI units because the inch-pound equivalents are not used in the practice.NOTE 1: Sieve size is identified by its standard designation in Specification E11. The alternative designation given in parentheses is for information only and does not represent a different standard sieve size.1.3 The text of this standard references notes and footnotes which provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the standard.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. For a specific hazard statement, see 6.1.4.1.5 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： 515元 加购物车

定价： 571元 加购物车

本文件规定了生态型尾矿库修建、测绘、检验、勘察、设计、渗流计算和防渗设施安全分析、闭库生态修复、既有库生态型评价、施工、检查与检测、竣工资料与验收的要求。
本文件适用于金属矿山生态型尾矿库的新建工程、既有尾矿库向生态型尾矿库的转变改造工程，非金属矿山尾矿库和其他类似工程可参考。

定价： 113元 / 折扣价： 97 元 加购物车

本文件规定了大型调水工程突发水污染事件应急预案的编制原则、编制程序以及编制内容等要求。本文件适用于大型调水工程突发水污染事件应急预案的编制工作。

定价： 54元 / 折扣价： 46 元 加购物车

定价： 24元 / 折扣价： 21 元 加购物车