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开拓爆破井巷、隧道等掘进工程中的爆破作业
expl. development blasting; heading blast
开拓爆破为开拓工程而进行的爆破作业
expl. development blast
开拓爆破
: 4 phrases in 1 subject
Explosives and Explosive Ordnance Disposal4

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