题目：
主要通风机停机后，如不开备用通风机则要（），井口防爆门和有关风门。
A、打开
B、关闭
答案：
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参考答案：C
主要通风机停机后，如不开备用通风机则要（），井口防爆门和有关风门。A、打开 B、关闭
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