GB/T 451.2-2023 Chinese PDF (GB/T451.2-2023) GB/T 27534.2-2025 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 12979-2024

GB/T 18024

GB/T 45146-2024_Chinese: Road vehicles - Air and air/hydraulic braking systems of motor vehicles test procedures (Chinese: 道路车辆 气压及气顶液制动系统试验方法)

English versions: GB/T 45496-2025

GB/T 451.2-2023 Chinese PDF (GB/T451.2-2023) GB/T 27534.2-2025 GB/T 14420-2024_Chinese: Analysis of waterGB T 451. 2 2023_Chinese: Paper and board Part 2: Determination of grammage (Chinese: 2) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB T 451. 2 2023