是井巷施工期间火灾事故的内因。A:电气着火B:瓦斯爆炸C:煤炭自燃D:煤尘爆炸

作者: rantiku 人气: - 评论: 0

问题是井巷施工期间火灾事故的内因。

选项 A:电气着火 B:瓦斯爆炸 C:煤炭自燃 D:煤尘爆炸

答案 C

解析

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