Home / Standards / GB/T 31087-2014 GB/T 31087-2014 Active General technical requirements for impurities control of commercial coal 商品煤杂物控制技术要求 Standard Type GBT ICS 73.040 CCS D01 Status 现行 Issue Date 2014-12-22 Implementation 2015-06-01 Responsible Dept 中国煤炭工业协会 Drafting Unit N/A