矿井必须建立测风制度，每______天进行一次全面测风。 -题库考试答案搜索网

矿井必须建立测风制度，每______天进行一次全面测风。

单选题

2021-09-02 13:15

A、5
B、10
C、15
D、30

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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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相关题目: You should _______________ to one or more weekly magazines such as Time or Newsweek.; You can _____ some bottles of wine, or some chocolates, or a bunch of flowers.; — ___________________

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