井巷工程施工爆破时,井工矿井如遇有瓦斯,起爆总延时不应大于()。A. 100ms B. 130ms C. 150ms D. 180ms

作者: rantiku 人气: - 评论: 0
问题 井巷工程施工爆破时,井工矿井如遇有瓦斯,起爆总延时不应大于()。
选项 A. 100ms B. 130ms C. 150ms D. 180ms
答案 B
解析

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