单项选择题
《金属非金属矿山安全规程》规定;地下矿山硐室型采场最低风速应不小于(),巷道型采场和掘进巷道应不小于()。
A、0.25m/s,0.15m/s
B、0.15m/s,0.25m/s
C、0.25m/s,0.25m/s
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单项选择题
A、0.25m/s,0.15m/s
B、0.15m/s,0.25m/s
C、0.25m/s,0.25m/s
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