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See Chinese contents: GB/T 2007.2-1987 GB/T 2007.2-1987: [GB 2007.2-1987] General rules for the sampling and sample preparation of minerals in bulk. Sample preparation by manual method
This General Rules applies to the preparation of samples taken according to the method specified in GB 2007.1. The prepared sample shall be representative of the quality characteristics of the original sample and suitable for analysis or test requirements.
