GB/T 38769-2020.Metallic materials-Measurement of fracture toughness at impact loading rates using precracked Charpy-type test pieces. 1范围 GB/T 38769规

GB/T 38769-2020.Metallic materials-Measurement of fracture toughness at impact loading rates using precracked Charpy-type test pieces. 1范围 GB/T 38769规

GB/T 38769-2020.Metallic materials-Measurement of fracture toughness at impact loading rates using precracked Charpy-type test pieces. 1范围 GB/T 38769规

GB/T 51417-2020.Technical standard for joint construction and sharing of telecommunication steel tower. 1总则 1.0.1 为进一步推进和规范电信钢塔架的共建共享工作,制定本标准。 1.0.2 G

GB/T 2889.2-2020.Plain bearings-Terms, definitions , classification and symbols-Part 2:Friction and wear. 1范围 GB/T 2889的本部分界定了与滑动轴承摩擦和磨损相关的最常用的术语、定义和分

GB/T 5226.34-2020.Electrical safety of machinery-Electrical equipment of machines一Part 34: Requirements for machine tools. 1范围 GB/T 5226的本部分规定了机床电气设备及

GB/T 2481.2-2020.Bonded abrasives-Determination and designation of grain size distribution-Part 2 :Microgrits. 1范围 GB/T 2481的本部分规定了刚玉、碳化硅微粉F230~ F2000

GB/T 38621-2020.Transient thermal test method for light emitting diode modules. 1范围 GB/T 38621规定了由单个、多个发光二极管(LED)芯片或器件组成的LED模块热特性瞬态测试方法原理、一般要求、测试步骤、结果

GB/T 38762.3-2020.Geometrical product specifications (GPS)一Dimensional tolerancing-Part 3: Angular sizes. 1范围 GB/T 38762.3建立了角度尺寸的缺省规范操作集,并为下列角度尺寸要素定义

GB/T 38762.2-2020.Geometrical product specifications(GPS) 一Dimensional tolerancing一Part 2:Dimensions other than linear or angular sizes. 1范围 GB/T 3876