Large section starting cut in top-coal caving face  综放大断面开切眼

fully mechanized longwall top coal caving face  综放工作面

Fully Mechanized Top Coal Caving Face  综采放顶煤工作面

Fully Mechanized Top-Coal Caving Face  综放工作面; 综放; 综放面

FULLY-MECHANIZED TOP-COAL CAVING FACE  综放工作面; 综放面

light supported top-coal caving face  轻放面

LONGWALL TOP-COAL CAVING FACE  综放面

Steeply inclined Longwell top-coal caving face  急倾斜长壁综放工作面

super long fully mechanized top coal caving face  超长综放工作面

Super-Length Fully-Mechanized Top-Coal Caving Face  超长综放面

top coal caving in horizontal sectional seam  水平分段放顶煤

TOP-COAL CAVING FACE  综放工作面; 放顶煤工作面

fully-mechanized face in coal seam  煤层综采面

capability of top coal caving  顶煤可放性

Caving Top Coal  放顶煤

full-mechanized top-coal caving  综放

fully machanized top coal caving  综放

fully mechanized high cutting and top coal caving mining technology  大采高综采放顶煤技术

Fully mechanized longwall top coal caving mining  综放开采