The sliding phenomenon between coal seam and its roof or floor is very common.
煤层及其顶底板中滑动现象极为普遍。
Roof control is key management of opening up coal seam with potential outburst in crosscut.
顶板管理是石门揭露突出煤层过程中的管理重点。
Roof control is key management of opening up coal seam with potential outburst in crosscut.
顶板管理是石门揭露突出煤层过程中的管理重点。
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