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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
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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