GB/T 39011.2-2020 技术制图活动铅笔第2部分:黑铅芯 分类和尺寸
GB/T 39011.2-2020.Mechanical pencils for technical drawings-Part 2: Black leads-...
国家标准2023.08.02
GB/T 39011.2-2020.Mechanical pencils for technical drawings-Part 2: Black leads-...
国家标准2023.08.02
GB/T 39011.1-2020.Mechanical pencils for technical drawings-Part 1:Classificatio...
国家标准2023.08.02
GB/T 6931.3-2020.Belt drives-Vocabulary-Part 3 :Synchronous belt drives.1范围GB/T...
国家标准2023.08.02
GB/T 12688.10-2020.Test method of styrene for industrial use-Part 10 : Determina...
国家标准2023.08.02
GB/T 229-2020.Metallic materials-Charpy pendulum impact test method.1范围GB/T 229规...
国家标准2023.08.02
GB/T 39516-2020.Micro nano standard samples( geometric).1范围GB/T 39516规定了微纳米标准样板(...
国家标准2023.08.02
GB/T 21967-2020.YBZE and YBZSE series flameproof electromagnetic braking three-p...
国家标准2023.08.02
GB/T 39495-2020.Metallic and other inorganic coatings- Chromate- free chemical c...
国家标准2023.08.02
GB/T 3221-2020.Code for mooring and sea trials of internal combustion engine-dri...
国家标准2023.08.02
GB/T 39361-2020.Discharge requirements for cooling seawater.1范围GB/T 39361规定了海水冷却...
国家标准2023.08.02