moderate longhole blasting 深孔爆破
large-diameter longhole blasting 大直径深孔爆破
large diameter longhole blasting 大直径深孔爆破
Undercutting by longhole blasting 深孔拉槽
shaft formation by longhole blasting 深孔爆破成井
longhole blasting in under-ground mine 地下矿深孔爆破
medium-longhole blasting in underground mine 地下矿中深孔爆破
longhole deck blasting method 深孔分层爆破法
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