... 顶板木锚杆：wood roof pin 顶板锚杆钻孔：roof bolt hole 顶板锚杆支护：back bolting ...
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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。
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