大煤 meaning in English

great coal

High - resolution coal - bearing sequence analysis of jurassic section in dameigou , chaidamu basin
柴达木盆地大煤沟侏罗系剖面高分辨率含煤层序分析
Analyzing to the phenomenon of underground pressure and the stress of surrounding rock in roadway protecting pillar
大煤柱护巷矿压显现规律及围岩应力实测分析
Numerical simulation on roadway protected by wide coal pillar in super - wide and isolated island fully mechanized top - coal caving face
综放面大煤柱护巷的数值模拟