当采用爆破作业时,必须采用安全炸药和瞬发雷管,当采用毫秒雷管时,其总延 期的时间必须少于()。A. 50ms B. 90ms C. 110ms ...

作者: rantiku 人气: - 评论: 0
问题 当采用爆破作业时,必须采用安全炸药和瞬发雷管,当采用毫秒雷管时,其总延 期的时间必须少于()。
选项 A. 50ms B. 90ms C. 110ms D. 130ms
答案 D
解析

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