GB/T 20657-2022 Chinese PDF (GB/T20657-2022) GB/T 10067.101-2023 English versions: GB/T 26940-2023

English versions: GB/T 26940-2023

GB/T 45635-2025_Chinese: Specifications for the control of biosafety risks in the operation and use of entry-exit special products (Chinese: 进出境特殊物品经营和使用生物安全风险控制规范)

English versions: GB/T 27651-2023

GB/T 45631-2025_Chinese: Requirements for flying management information of surveying and mapping with unmanned aircraft system(UAS) (Chinese: 无人机遥感测绘飞行管理信息要求)

English versions: GB/T 28906-2025

GB/T 20657-2022 Chinese PDF (GB/T20657-2022) GB/T 10067.101-2023 English versions: GB/T 26940-2023GB T 20657 2022_Chinese: Petroleum and natural gas industries Formulae and calculations for the properties of casing, tubing, drill pipe and line pipe used as casing or tubing (Chinese: ) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB T 20657 2022