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直孔掏槽
expl. burn cut; bum-out cut
直孔掏槽掏槽孔均垂直于掘进工作面,彼此间距较小,并有不装药空孔的掏槽方式
expl. burn-out cut
直 孔掏槽
: 3 phrases in 1 subject
Explosives and Explosive Ordnance Disposal3