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次成巷
掘进、永久支护和水沟掘砌作业,在一定距离内,相互配合、前后衔接、最大限度地同时施工,一次完成的巷道施工方法
expl.
simultaneous drifting
次成 巷
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4 phrases
in 1 subject
Explosives and Explosive Ordnance Disposal
4
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