GB/T 21267-2024 Chinese PDF (GB/T21267-2024) GB/T 44971-2024 English versions: GB/T 45327-2025

English versions: GB/T 45327-2025

English versions: GB/T 45318-2025

Note/Careful: Text of PDF is in Chinese (not English)

GB 29449-2024_Chinese: Norm of energy consumption per unit production of tyre and carbon black (Chinese: 轮胎和炭黑单位产品能源消耗限额)

GB/T 45344-2025_Chinese: General technical requirements for fabricated and prefabricated gas piping used in buildings (Chinese: 建筑用装配式预制燃气管道通用技术条件)

GB/T 21267-2024 Chinese PDF (GB/T21267-2024) GB/T 44971-2024 English versions: GB/T 45327-2025GB T 21267 2024_Chinese: Petroleum and natural gas industries Procedures for testing casing and tubing connections (Chinese: ) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB T 21267 2024