After several years to jumbolter research,the hard rocks always present in the soft ones in the wall rock procedure using jumbolter,which results in changing the boring tool during the procedure.
经过几年对
机的跟踪研究,发现机在围
作业中
遇到软中有硬
的现象,造成施工过程经更换具的问题。
柱
机,
机(孔和安装用)After several years to jumbolter research,the hard rocks always present in the soft ones in the wall rock procedure using jumbolter,which results in changing the boring tool during the procedure.
经过几年对机的跟踪研究,发现机在围作业中遇到软中有硬的现象,造成施工过程经更换具的问题。
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