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See Chinese contents: GB/T 19494.2-2004 GB/T 19494.2-2004: Mechanical sampling of coal -- Part 2: Method for sample preparation
This part of GB/T 19494 specifies the terms and definitions for coal sample preparation; the composition, division, reduction, mixing, air drying of samples; the preparation of various coal samples; the design of reference coal samples and sample preparation equipment.
