GB/T 20991-2024 Chinese PDF (GB /T20991-2024) GB/T 21666-2025 GB/T 17670-2025_Chinese: Unified coding for

GB/T 17670-2025_Chinese: Unified coding for natural stone (Chinese: 天然石材统一编号)

1）第1部分：基本记法规范)

English versions: GB/T 25820-2025

3-2025_Chinese: Criteria for nuclear reactor instrumentation - Part 3: High temperature gas-cooled reactor (Chinese: 核反应堆仪表准则 第3部分：高温气冷反应堆)

GB 15605-2024_Chinese: Specifications for pressure venting of dust explosion (Chinese: 粉尘爆炸泄压规范)

GB/T 20991-2024 Chinese PDF (GB /T20991-2024) GB/T 21666-2025 GB/T 17670-2025_Chinese: Unified coding forGB T 20991 2024_Chinese: Foot protection Test methods for footwear (Chinese: ) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB T 20991 2024