GB/T 22939.1-2025 Chinese PDF (GB /T22939.1-2025) GB 45669.1-2025 GB/T 21638-2025_Chinese: Microbeam analysis -

GB/T 21638-2025_Chinese: Microbeam analysis - Guidelines for electron beam microanalysis of defects in steel materials (Chinese: 微束分析 钢铁材料缺陷电子束显微分析方法通则)

English versions: GB/T 29117-2025

1-2024_Chinese: Methods for chemical analysis of lithium cobalt oxide - Part 1: Determination of cobalt content - EDTA titration and potentiometric titration (Chinese: 钴酸锂化学分析方法 第1部分：钴含量的测定 EDTA 滴定法和电位滴定法)

GB/T 30425-2025_Chinese: Water cooling equipment for converter valves for high voltage direct current(HVDC) ower transmission (Chinese: 高压直流输电换流阀水冷却设备)

setting time and soundness of the Portland cement (Chinese: 水泥标准稠度用水量、凝结时间与安定性检验方法)

GB/T 22939.1-2025 Chinese PDF (GB /T22939.1-2025) GB 45669.1-2025 GB/T 21638-2025_Chinese: Microbeam analysis -GB T 22939. 1 2025_Chinese: Package of household and similar electrical appliances Part 1: General requirements (Chinese: 1) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB T 22939. 1 2025