长壁留煤柱支撑法开采的关键技术是区分两类不同性质的煤柱，即区内煤柱和区域间的隔离煤柱。
The key technology of longwall remaining coal pillars support mining is to distinguish two kinds of coal pillars of different character between regional coal pillar and isolated coal pillar.
长壁留煤柱支撑法开采的关键技术是区分两类不同性质的煤柱，即区内煤柱和区域间的隔离煤柱。
The key technology of longwall remaining coal pillars support mining is to distinguish two kinds of coal pillars of different character between regional coal pillar and isolated coal pillar.
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