煤巷放炮距离应不小于多少米?

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煤巷放炮距离应不小于多少米?煤巷放炮距离应不小于多少米?煤巷放炮距离应不小于多少米?75米

煤巷放炮距离应不小于多少米?
煤巷放炮距离应不小于多少米?

煤巷放炮距离应不小于多少米?
75米