立井井筒基岩段采用爆破法掘进施工,通常采用伞形钻架打眼,伞形钻架一次钻 眼深度一般为( )。A. 2m以下 B. 2~3m C. 3~5m D. 5m以上

作者: tihaiku 人气: - 评论: 0
问题 立井井筒基岩段采用爆破法掘进施工,通常采用伞形钻架打眼,伞形钻架一次钻 眼深度一般为( )。
选项 A. 2m以下 B. 2~3m C. 3~5m D. 5m以上
答案 C
解析

相关内容:立井,井筒,基岩,段采用,爆破,施工,伞形,钻架,深度

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