分析了放顶煤开采顶煤冒放性的影响因素。

Analyses factors that affect cover caving ability of roof coal in sublevel caving mining method.

youdao

分析了放顶煤开采顶煤冒放性的影响因素。

Analyses factors that affect cover caving ability of roof coal in sublevel caving mining method.

youdao