GB/T 21974-2024 Chinese PDF (GB/T21974-2024) GB/T 1149.11-2023 20-2025_Chinese: Methods for chemical analysis

20-2025_Chinese: Methods for chemical analysis of tungsten concentrates - Part 20: Determination of mercury content - Solid sampling and direct mercury analysis method (Chinese: 钨精矿化学分析方法 第20部分：汞含量的测定 固体进样直接测定法)

GB/T 20604-2025_Chinese: Natural gas - Vocabulary (Chinese: 天然气 词汇)

39-2025_Chinese: Requirements of the greenhouse gas emissions accounting and reporting - Part 39: Calcined gypsum enterprises (Chinese: 温室气体排放核算与报告要求 第39部分：建筑石膏生产企业)

English versions: GB 31604

supplied electronic control gear for fluorescent lamps (Chinese: 光源控制装置 第2-3部分：荧光灯用交流和/或直流电子控制装置的特殊要求)

GB/T 21974-2024 Chinese PDF (GB/T21974-2024) GB/T 1149.11-2023 20-2025_Chinese: Methods for chemical analysisGB T 21974 2024_Chinese: YZRW series eddy current braking wound rotor three phase induction motors for crane and metallurgical applications Technical specification (frame size 112315) (Chinese: YZRW 112315) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB T 21974 2024