Home / Standards / GB/T 2291-2016 GB/T 2291-2016 Active Method for preparation of coal tar pitch specimens 煤沥青实验室试样的制备方法 Standard Type GBT ICS 71.080 CCS G18 Status 现行 Issue Date 2016-12-13 Implementation 2017-07-01 Responsible Dept 国家标准委 Drafting Unit N/A