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to phrases
vertical crater retreat
earth.sc.
垂直漏斗后退式开采
expl.
垂直漏斗后退式开采
1975年首次在加拿大列瓦克镍矿成功地用于矿柱,目前在美国和中国等矿山不仅用于矿柱回采,也用于矿房回采。在矿体中钻出垂直或倾斜的平行炮孔,并用集中药包相继起爆,在矿体中形成倒向漏斗,从矿房中运出漏斗中的破碎岩石
;
VCR 米矿法
vertical crater retreat
:
4 phrases
in 1 subject
Explosives and Explosive Ordnance Disposal
4
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