GB/T 19212.5-2025 Chinese PDF (GB /T19212.5-2025) GB/T 20405.4-2025 GB/T 25187-2024_Chinese: Surface chemical analysis

GB/T 25187-2024_Chinese: Surface chemical analysis - Auger electron spectroscopy - Description of selected instrumental performance parameters (Chinese: 表面化学分析 俄歇电子能谱 选择仪器性能参数的表述)

GB/T 20032-2024_Chinese: Managing risk in projects - Application guidelines (Chinese: 项目风险管理 应用指南)

English versions: GB 45248-2025

GB/T 18822

GB/T 19212.5-2025 Chinese PDF (GB /T19212.5-2025) GB/T 20405.4-2025 GB/T 25187-2024_Chinese: Surface chemical analysisGB T 19212. 5 2025_Chinese: Safety of transformers, reactors, power supply units and combinations thereof Part 5: Particular requirements and tests for isolating transformers and power supply units incorporating isolating transformers for general applications (Chinese: 5) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB T 19212. 5 2025