fully mechanized coal mining face in steep inclined seam  急倾斜综采

fully-mechanized face in coal seam  煤层综采面

protected coal seam mining  保护层开采

abnormal coal mining face  不规则工作面

Coal Mining Face  工作面; 回采工作面; 回采面

COAL SEAM MINING  煤层开采

drilling and blasting coal mining face  炮采工作面

Drivage in coal seam prone to outburst  突出煤层掘进

dust falling in coal mining  煤矿降尘

First Coal Mining Face  首采工作面

fracture in coal-seam  煤层裂隙

full-mechanized mining face in thick coal seam  厚煤层综采工作面

fully mechanizad coal mining face  综采工作面

Fully Mechanized Coal Mining Face  综采工作面; 综放工作面

Fully- mechanized Coal Mining Face  综采工作面

Fully Mechanized Longwall Coal Mining Face  综采工作面

fully mechanized top coal caving mining face in island seam  孤岛综放面

Gas in Coal Seam  煤层瓦斯

green technique in coal mining  绿色开采