每季度应至少检查1次反风设施，每______应进行1次反风演习；当矿井通风系统有较大变化时，应进行1次反风演习。 -题库考试答案搜索网

每季度应至少检查1次反风设施，每______应进行1次反风演习；当矿井通风系统有较大变化时，应进行1次反风演习。

单选题

2021-09-01 22:49

A、一个月
B、半年
C、一年
D、两年

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正确答案

C

试题解析

标签：联大河南理工大学矿井通风与安全课程设计

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