大倾角综采放顶煤
the steep-grade angle and top coal mining
短长壁综采放顶煤
shorter long-wall full-mechanized caving mining
放顶煤
top coal caving
caving top coal
top-coal drawing
Top-coal Caving
top-coal caving mining
blasting down coal
caving
Sublevel caving
carry out the head coal
coal caving
caving coal
coal caving mining
longwall face with sublevel caving
含夹矸顶煤
top coal seam with parting band
简易放顶煤
Drawing Top-Coal with Hydraulic Props
炮采放顶煤
blasting coal caving face by blasting
artillery mining coal
caving-working-face
顶煤移动规律
rules of roof coal movement
轻型综采放顶煤
light supported fully mechanized caving
Top-coal caving with light support
水平分段放顶煤
horizontal section top-coal caving
horizontal section top coal caving
horizontal section caving
horizontal sectional top coal caving
top coal caving in horizontal sectional seam
网下放顶煤
Caving Mining under Metal Mesh
巷柱式放顶煤
Gateway and pillar top coal caving
roadway caving mining
轻型支架放顶煤
light supports caving mining
顶煤下沉量
subsidence of roadway roof coal