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爆破后必须经过()通风排烟后,检查人员方可进入工作面,检查有无“盲炮”及可疑现象。A.5minB.10minC
爆破后必须经过()通风排烟后,检查人员方可进入工作面,检查有无“盲炮”及可疑现象。
A.5min
B.10min
C.15min
D.30min
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爆破后必须经过()通风排烟后,检查人员方可进入工作面,检查有无“盲炮”及可疑现象。
A.5min
B.10min
C.15min
D.30min
A.5,10
B.5,15
C.10,15
D.10,20
A.515
B.510
C.1520
D.1015