GB/T 21431-2023 Chinese PDF (GB/T21431-2023) GB/T 26794-2023 GB/T 14420-2024_Chinese: Analysis of water

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)

English versions: GB/T 28168-2025

4-2023_Chinese: Agricultural irrigation equipment - Sprinklers - Part 4: Test methods for durability (Chinese: 农业灌溉设备 喷头 第4部分：耐久性试验方法)

English versions: GB/T 29772-2024

GB/T 21431-2023 Chinese PDF (GB/T21431-2023) GB/T 26794-2023 GB/T 14420-2024_Chinese: Analysis of waterGB 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