Home / Standards / GB/T 2011-1987 GB/T 2011-1987 Active Method of sampling and sample preparation of manganeseores in bulk 散装锰矿石取样、制样方法 Standard Type GBT ICS 73.020 CCS D32 Status 现行 Issue Date 1987-12-19 Implementation 1988-10-01 Responsible Dept 市场监管总局 Drafting Unit N/A