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GB/T 23561.1-2024_Chinese: Methods for determining the physical and mechanical properties of coal and rock - Part 1: General requirements for sampling (Chinese: 煤和岩石物理力学性质测定方法 第1部分：采样一般规定) Note/Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working-hours typically, ASAP English versions: GB/T 23561.1-2024
