备用的主要通风机，必须在______min中内开动 -题库考试答案搜索网

备用的主要通风机，必须在______min中内开动

单选题

2021-09-02 13:15

A、5
B、10
C、15
D、20

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正确答案

B

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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