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GB/T 23561.12-2024 Chinese PDF (GB/T23561.12-2024)
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GB/T 23561.12-2024 Chinese PDF (GB/T23561.12-2024)
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GB/T 23561.12-2024 Chinese PDF (GB/T23561.12-2024)GB 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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