GB/T 20972.2-2025 Chinese PDF (GB /T20972.2-2025) GB 5009.300-2025 English versions: GB/T 17554

English versions: GB/T 17554

English versions: GB/T 15972

1-2025_Chinese: Information technology - Abstract Syntax Notation One(ASN

English versions: GB/T 11918

GB/T 19701

GB/T 20972.2-2025 Chinese PDF (GB /T20972.2-2025) GB 5009.300-2025 English versions: GB/T 17554GB T 20972. 2 2025_Chinese: Petroleum and natural gas industries Materials for use in H2S containing environments in oil and gas production Part 2: Cracking resistant carbon and low alloy steels, and the use of cast irons (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 20972. 2 2025