分析了确定综采放顶煤开采工艺易发火地区及发火原因。

The easy ignition area in compound mining caving coal process and reason are analyzed and determined.

youdao

分析了确定综采放顶煤开采工艺易发火地区及发火原因。

The easy ignition area in compound mining caving coal process and reason are analyzed and determined.

youdao