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超前巷道
expl. fast; fast place
tech. advance gallery; advance workings; pilot drift; pilot workings
超前巷道参见 pilot heading
expl. advance heading
超前掘进巷道
gen. fore-drift
超前巷道扩展成全断面平巷或平硐之前的小断面巷道，参见 advance heading
expl. pilot heading
超前 巷道: 1 phrase in 1 subject
Mining1

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