某立井井筒净直径为5. 5m,深度650m,基岩段施工采用高度3. 5m的金属伸缩 式模板砌壁,工作面常用伞钻打眼的合理炮眼深度应为()。A. 2. 0m...

作者: rantiku 人气: - 评论: 0
问题 某立井井筒净直径为5. 5m,深度650m,基岩段施工采用高度3. 5m的金属伸缩 式模板砌壁,工作面常用伞钻打眼的合理炮眼深度应为()。
选项 A. 2. 0m B. 3. 0m C. 4. 0m D. 5. 0m
答案 C
解析

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