问题描述:
[单选]
什么情况下不需要进入避难所Under what situation do not need to enter into refugee chamber?
A.a.井下发生火灾、爆炸Fire & explosion
B.b.有毒有害气体涌入井下Gas spilling
C.c.井下空气遭到污染Air polluted
D.d.人员站在井口附近Persons standing near the ground
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答案解析:无
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