GB/T 20972.2-2025 Chinese PDF (GB /T20972.2-2025) GB/T 20854-2025 2-2024_Chinese: Cardiovascular implants - Cardiac

2-2024_Chinese: Cardiovascular implants - Cardiac valve prostheses - Part 2: Surgically implanted heart valve substitutes (Chinese: 心血管植入器械 人工心脏瓣膜 第2部分：外科植入式人工心脏瓣膜)

English versions: GB/T 17215

English versions: GB/T 19088-2024

GB 19081-2025_Chinese: Safety specification for dust explosion prevention in feed processing system (Chinese: 饲料加工系统粉尘防爆安全规范)

GB/T 20972.2-2025 Chinese PDF (GB /T20972.2-2025) GB/T 20854-2025 2-2024_Chinese: Cardiovascular implants - CardiacGB 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