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See Chinese contents: GB/T 19494.2-2023 GB/T 19494.2-2023: Mechanical sampling of coal - Part 2: Method for sample preparation
This document specifies the precision of coal sample preparation, specimen composition, division, reduction, mixing and air-drying, as well as the preparation of various coal samples, coal sample for back-check and the design requirements for sample preparation equipment. This document is applicable to lignite, bituminous coal and anthracite coal.
