Home / Standards / GB/T 20966-2007 GB/T 20966-2007 Active Determination of particle size distribution for colliery powders 煤矿粉尘粒度分布测定方法 Standard Type GBT ICS 13.100 CCS D09 Status 现行 Issue Date 2007-07-02 Implementation 2008-01-01 Responsible Dept 中国煤炭工业协会 Drafting Unit N/A