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双V形掏槽
平硐掘进的掏槽法,炮孔以一定的角度相向钻进,呈 V 字形,但彼此的高度不一样。“双”是指两个相邻的V 一前一后地排列
expl.
double V cut
双V形掏 槽
:
4 phrases
in 2 subjects
Explosives and Explosive Ordnance Disposal
3
Technology
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