本标准规定了开槽长圆柱端紧定螺钉的型式尺寸、技术条件和标记。
本标准适用于螺纹规格为M1.6～M12、产品等级为A级的开槽长圆柱端紧定螺钉。

定价： 24元 / 折扣价： 21 元 加购物车

本规程适用于(0～1 084.62)℃一等、二等标准铂铑10-铂热电偶的首次检定和后续检定。

定价： 38元 / 折扣价： 33 元 加购物车

本标准规定了基于遥感的建筑物震害评估内容、方法及成果表达。
本标准适用于利用遥感开展建筑物破坏评估。

定价： 24元 / 折扣价： 21 元 加购物车

定价： 350元 / 折扣价： 312 元 加购物车

定价： 666元 / 折扣价： 593 元 加购物车

定价： 260元 / 折扣价： 221 元 加购物车

定价： 2331元 / 折扣价： 2075 元 加购物车

本文件规定了测定地表水中化学需氧量的连续流动分析分光光度法。本文件适用于地表水中化学需氧量的测定。本文件的检出限为1.3 mg/L，测定下限为5.2 mg/L。当样品浓度超过200 mg/L或氯离子浓度大于200 mg/L时，宜经稀释后测定。

定价： 26元 / 折扣价： 23 元 加购物车

本文件规定了网络安全检测人员的能力要求，确立了网络安全检测人员能力等级分类，还规定了不同等级网络安全检测人员应具备相应等级的基本技能及专业技能的要求。
本文件适用于网络安全检测人员的使用、培养、评价和管理等。

定价： 31元 / 折扣价： 27 元 加购物车

本文件给出了微动探测的基本规定，确立了探测方案、仪器设备、数据采集、资料处理与解释、成果报告、成果验收的体系。
本文件适用于工程建设过程中的规划、勘察、设计、施工管理与运营，以及防灾减灾、环境保护和地质调查、资源勘探等领域的微动探测。

定价： 33元 / 折扣价： 29 元 加购物车

本规程适用于新制造和使用中的1等、2等标准铂铑10-铂热电偶的检定。

定价： 32元 / 折扣价： 28 元 加购物车

定价： 590元 加购物车

This specification establishes the requirements for seamless round, rectangular, and square copper tube (UNS Nos. C10100, C10200, C10300, C10800, C12000, and C12200) suitable for general engineering applications. The material of manufacture shall be billets, cast bars, or tube. The tube shall be manufactured by hot- and cold-working processes, shall be cold drawn to the finished size and wall thickness, and shall be supplied in cold-drawn or annealed temper condition. The material shall conform to the chemical composition requirements prescribed for copper, phosphorus, and arsenic, as determined by chemical analysis, and to the mechanical property requirements including tensile strength, yield strength, Rockwell hardness, and straightening. Requirements for grain size, electrical mass resistivity, and dimensions are specified. The following test methods are detailed: grain size, electrical resistivity, tensile and yield strength, and hardness tests, expansion test for round table, microscopical examination, test for hydrogen embrittlement, and nondestructive tests such as electromagnetic (eddy-current), hydrostatic, and pneumatic pressure tests.1.1 This specification2 establishes the requirements for seamless round, rectangular, and square copper tube suitable for general engineering applications.1.1.1 Tubes made from any of the following Copper UNS No. designations shall be supplied unless otherwise specified in the contract or purchase order:Copper UNS No. Type of Copper   C10100 Oxygen-free electronicC10200 Oxygen-free without residual deoxidantsC10300 Oxygen-free, extra low phosphorusC10800 Oxygen-free, low phosphorusC12000 Phosphorus deoxidized, low residual phosphorusC12200 Phosphorus deoxidized, high residual phosphorus1.2 Units—The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, SI units are shown in brackets. 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.1.3 The following safety hazard caveat pertains only to the test methods described in this specification: 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 加购物车

4.1 Sampling is equally as important as the testing, and the sampler shall use every precaution to obtain samples that will show the nature and condition of the materials which they represent.4.2 Samples for preliminary investigation tests are obtained by the party responsible for development of the potential source (Note 3). Samples of materials for control of the production at the source or control of the work at the site of use are obtained by the manufacturer, contractor, or other parties responsible for accomplishing the work. Samples for tests to be used in acceptance or rejection decisions by the purchaser are obtained by the purchaser or his authorized representative.NOTE 3: The preliminary investigation and sampling of potential aggregate sources and types occupies a very important place in determining the availability and suitability of the largest single constituent entering into the construction. It influences the type of construction from the standpoint of economics and governs the necessary material control to ensure durability of the resulting structure, from the aggregate standpoint. This investigation should be done only by a responsible, trained, and experienced person. For more comprehensive guidance, see the appendixes.1.1 This practice covers sampling of coarse and fine aggregates for the following purposes:1.1.1 Preliminary investigation of the potential source of supply,1.1.2 Control of the product at the source of supply,1.1.3 Control of the operations at the site of use, and1.1.4 Acceptance or rejection of the materials.NOTE 1: Sampling plans and acceptance and control tests vary with the type of construction in which the material is used.1.2 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.1.3 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.NOTE 2: The quality of the results produced by this standard are dependent on the competence of the personnel performing the procedure and the capability, calibration, and maintenance of the equipment used. Agencies that meet the criteria of Specification D3666 are generally considered capable of competent and objective testing, sampling, inspection, etc. Users of this standard are cautioned that compliance with Specification D3666 alone does not completely ensure reliable results. Reliable results depend on many factors; following the suggestions of Specification D3666 or some similar acceptable guideline provides a means of evaluating and controlling some of those factors.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 加购物车

本文件规定了高强石膏空心隔墙板的分类、规格、标记、技术要求，确立了相应的检验规则，描述了试验方法，规定了标志、运输及贮存等方面的内容。
本文件适用于建筑物中非承重内隔墙用高强石膏空心隔墙板的生产和检验。

定价： 31元 / 折扣价： 27 元 加购物车