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English versions: GB/T 45138-2024
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: 煤和岩石物理力学性质测定方法 第 12 部分: 煤的坚固性系数测定方法)
English versions: GB/T 23307-2023
English versions: GBZ27001-2025
English versions: GB 45246-2025
GB/T 2423.65-2024 Chinese PDF (GB/T2423.65-2024) GB/T 5856-2024 English versions: GB/T 45138-2024GB T 2423. 65 2024_Chinese: Environmental testing Part 2: Test methods Test: Combined salt mist temperature humidity solar radiation (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 2423. 65 2024
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