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English versions: GB/T 31239-2023
English versions: GB/T 45218-2025
GB/T 2516-2023_Chinese: General purpose metric screw threads - Limit deviations (Chinese: 普通螺纹 极限偏差)
English versions: GB 44016-2024
opinion and social research
GB/T 23561.12-2024 Chinese PDF (GB/T23561.12-2024) GB/T 28511.2-2023 English versions: GB/T 31239-2023GB T 23561. 12 2024_Chinese: Methods for determining the physical and mechanical properties of coal and rock Part 12: Method for the determination coal hardiness coefficients (Chinese: 12 : ) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB T 23561. 12 2024
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