stoping hole 中文意思是什麼
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Application of medium - length hole sublevel open stoping to the mining of thick part of high grade complex orebody
中深孔分段空場采礦法在高品位復雜難采厚礦段的應用 -
Study on high sublevel stoping of shallow - hole shrinkage system with sill pillar in thin - small ore body
薄小礦體有底柱淺孔留礦法高分段回採的研究
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