There are many kinds of strata in roof bolt hole. Proper using and choosing are available for increasing comprehensive benefit.
锚杆钻孔所遇岩层种类较多，合理地选择锚杆钻头类型有利于提高综合效益。
There are many kinds of strata in roof bolt hole. Proper using and choosing are available for increasing comprehensive benefit.
锚杆钻孔所遇岩层种类较多，合理地选择锚杆钻头类型有利于提高综合效益。
应用推荐