Controlling roof accidents and preventing the occurrence of bursting underground pressure are the priorities and difficulties to mine deeper isolated pillar face.
控制顶板事故，防范冲击矿压的发生是开采埋深较大的孤岛煤柱工作面的重点和难点。
Controlling roof accidents and preventing the occurrence of bursting underground pressure are the priorities and difficulties to mine deeper isolated pillar face.
控制顶板事故，防范冲击矿压的发生是开采埋深较大的孤岛煤柱工作面的重点和难点。
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