1、石炭
... pit casting 坑铸 pit coal 石炭 pit crane 均热炉起重机 ...
2、矿煤
... piston-ring 活塞环 pit coal 矿煤 pit corrosion 麻点腐蚀 ...
3、垃圾煤
... coal open-pit mining 露天采煤 pit coal 石炭 ; 矿煤 ; 煤 ; 垃圾煤 Open Pit Coal Mine 露天煤矿 ...
4、沥青煤
... 辉矿类 glance 无烟煤；沥青煤 glance coal; pit coal 珠光硅铝石 glance-spar ...
Pit ch coal烟煤
open pit coal field露天煤田
Open Pit Coal Mine露天煤矿
open pit coal mines露天煤矿
Pit Coal mine煤矿
Heidaigou open-pit coal mine黑岱沟露天煤矿
deep open-pit coal mine深大型露天煤矿
Modernized open-pit coal mine现代化露天煤矿