cover caving 中文意思是什麼
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Application of mining method with - beam cover caving in shannan colliery
型梁放頂煤採煤法在山南井的應用 -
On the cover caving in the sublevel caving of slightly dipped thick orebody
緩傾斜厚礦體無底柱分段崩落法放頂方式探討 -
Destructive study of the cover rock relating to the fully mechanized mining with caving method under ravelly ground and nappe
鬆散層及推覆體下綜放開采覆巖破壞研究
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