矿井火灾分内因火灾和外因火灾两类。_爱下问搜题

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问题判断题

矿井火灾分内因火灾和外因火灾两类。

答案

参考答案：对

选择题

Scientists have many theories about how the universe _____ into being.

A. came
B. was coming
C. had come
D. would come

填空题

矿井水文地质类型划分为（）、（）、（）、（）等4种。