Home / Standards / GB/T 8899-2013 GB/T 8899-2013 Active Determination of maceral group composition and minerals in coal 煤的显微组分组和矿物测定方法 Standard Type GBT ICS 73.040 CCS D26 Status 现行 Issue Date 2013-12-17 Implementation 2014-05-01 Responsible Dept 中国煤炭工业协会 Drafting Unit N/A