长壁综采放顶煤采煤方法
longwall fully mechanized overhead caving coal mining
大采高综采放顶煤技术
fully mechanized high cutting and top coal caving mining technology
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
放顶拉底
artifical caving and undercut
放顶煤
Sublevel caving
longwall face with sublevel caving
coal caving mining
caving top coal
caving coal
coal caving
Top-coal Caving
top-coal caving mining
carry out the head coal
top-coal drawing
caving
top coal caving
blasting down coal
放顶煤采煤法
Longwall Mining with Sublevel Caving
放顶煤综采
fully mechanized caving coal
简易放顶煤
Drawing Top-Coal with Hydraulic Props