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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 Disposal
4
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