Home / Standards / GB/T 23561.12-2010 GB/T 23561.12-2010 Abolished Methods for determining the physical and mechanical properties of coal and rock - Part 12: Method for determining coal hardiness coefficient 煤和岩石物理力学性质测定方法 第12部分：煤的坚固性系数测定方法 Standard Type GBT ICS 73.010 CCS D04 Status 废止 Issue Date 2010-09-26 Implementation 2011-02-01 Responsible Dept 中国煤炭工业协会 Drafting Unit 中国煤炭工业协会