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平行炮孔掏槽掏槽的一种方式。与工作面成一定角度的钻孔为倾斜孔掏槽,20世纪40年代后期出现了垂直工作面的直孔掏槽，也称平行掏槽、平行空孔直线掏槽
expl. parallel cut
平行炮孔掏槽
tech. parallel hole cut
平行炮孔掏 槽
: 3 phrases in 2 subjects
Explosives and Explosive Ordnance Disposal2
Technology1

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