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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
: 4 phrases in 1 subject
Explosives and Explosive Ordnance Disposal4

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