GB 2007.7-1987 General rules for sampling and sample preparation of bulk mineral products Particle size determination method - manual sieving method (English Version)
General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
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GB 2007.7-1987
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1980GB 2007.7-1987 General rules for sampling and sample preparation of bulk mineral products Particle size determination method - manual sieving method