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炮孔切断下一段炮孔的口部,被相邻的上一段炮孔爆破炸飞的现象。在煤矿中，被切断的炮孔爆炸火焰易外泄，是点燃瓦斯和煤尘并引起爆炸的危险因素
expl. out-off of hole
炮 孔切断
: 7 phrases in 1 subject
Explosives and Explosive Ordnance Disposal7

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