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)

GB 28263-2024_Chinese: Regulations of safety management for the civil explosive products’ production and sales enterprise (Chinese: 民用爆炸物品生产、销售企业安全管理规程)

3-2025_Chinese: Petroleum and natural gas industries - Materials for use in H2S-containing environments in oil and gas production - Part 3: Cracking-resistant CRAs(corrosion-resistant alloys) and other alloys (Chinese: 石油天然气工业 油气开采中用于含硫化氢环境的材料 第3部分：抗开裂耐蚀合金和其他合金)

requirements and guidelines (Chinese: 环境管理 产品系统生态效率评估 原则、要求与指南)

GB/T 24055

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