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[单选题]
根据《煤矿安全规程》的要求,生产矿井主要通风机必须装有反风设施,并能在()内改变巷道中的风流方向。
A.5min
B.10min
C.15min
查看答案
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A.5min
B.10min
C.15min
A.10min
B.15min
C.20min
A.生产矿井主要通风机必须装有反风设施
B.10min内改变巷道中的风流方向
C.反风量不小于正常供风量的60%
D.每季度应至少检查1次反风设施
E.每年应进行1次反风演习
A.5;30%.
B.10;40%.
C.15;50%.
D.20;60%.