Code of China Chinese Standard Classification Professional Classification ICS Classification Latest
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GB/T 24233-2009 Manganese and chromium ores—Experimental methods for evaluation of quality variation and methods for checking the precision of sampling 230.0 via email in 1~3 business day valid
GB/T 24232-2009 Manganese and chromium ores—Experimental methods for checking the bias of sampling and sample preparation 170.0 via email in 1~3 business day valid
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