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.
经过几年对锚杆钻机的跟踪研究,发现锚杆钻机在围岩作业中
遇到软岩中有硬岩夹层的现象,造成施工过程经更换钻具的问题。
、词性分类均由互联网资源自动生成，部分未经过人工审核，其表达内容亦不代表本软件的观点；若发现问题，欢迎向我们指正。
