GB/T 37183-2023 Chinese PDF (GB/T37183-2023) GB/T 21536-2024 English versions: GB/T 45458-2025

English versions: GB/T 45458-2025

English versions: GB/T 15035-2023

English versions: GB 45549-2025

1-2023_Chinese: Buried polyethylene(PE) piping systems for the supply of gaseous fuels - Part 1: General (Chinese: 燃气用埋地聚乙烯（PE）管道系统 第1部分：总则)

1-2025_Chinese: Specifications for the social security card one-card-pass of the People's Republic of China - Part 1: Basic specifications (Chinese: 中华人民共和国社会保障卡一卡通规范 第1部分：基础规范)

GB/T 37183-2023 Chinese PDF (GB/T37183-2023) GB/T 21536-2024 English versions: GB/T 45458-2025GB T 37183 2023_Chinese: Corrosion control engineering life cycle Risk assessment (Chinese: ) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB T 37183 2023