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炮孔爆破率单位炮孔长度所爆破的岩〈煤〉量
expl. hole blasting factor
炮孔爆破率单位炮孔长度所爆破的矿岩量
expl. efficiency of hole blasting
炮 孔爆破率
: 2 phrases in 1 subject
Explosives and Explosive Ordnance Disposal2

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