煤系软弱(夹)层
Adhesion and proliferation
煤系烃源岩
coal measures source rock
煤系硬质高岭(土)岩
coal-measure hard kaolin(kaolinite
煤系有机质
organic matter in coal source rock
煤系与红层
coal measures and red beds
煤系原料
treated carbon powders from coals
煤系针状焦生焦
The semicoke of needle coke
内蒙古煤系
Inner Mongolia coal measure
内蒙古煤系高岭土
Inner Mongolia kaolin of coal measures
山西组煤系
coal-measures of the Shanxi Formation
上古生界煤系
Neopaleozoic coal-bearing series