GB/T 21431-2023 Chinese PDF (GB/T21431-2023) GB/T 26794-2023 1-2024_Chinese: Non-destructive testing - Magnetic

1-2024_Chinese: Non-destructive testing - Magnetic particle testing - Part 1: General principles (Chinese: 无损检测 磁粉检测 第1部分：总则)

English versions: GB/T 1984-2024

English versions: GB/T 44871-2024

English versions: GB/T 10335

GB/T 14420-2024_Chinese: Analysis of water used in boiler and cooling system - Determination of chemical oxygen demand - Rapid method with potassium dichromate (Chinese: 锅炉用水和冷却水分析方法 化学耗氧量的测定 重铬酸钾快速法)

GB/T 21431-2023 Chinese PDF (GB/T21431-2023) GB/T 26794-2023 1-2024_Chinese: Non-destructive testing - MagneticGB T 21431 2023_Chinese: Technical specification for inspection of lightning protection systems of buildings (Chinese: ) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB T 21431 2023