large-diameter hole drill 大口径钻孔
large-diameter-hole mining 大直径深孔采矿法
large-diameter hole-excavating pile 大直径挖孔桩
large-diameter hole presplitting blasting 大孔径预裂爆破
large hole diameter perforation 大直径炮眼
Large diameter long-hole drilling 大直径深孔凿岩
large diameter pile hole 大直径钻孔灌注桩
large diameter deep hole 大直径深孔
What we have done in this paper is of great significance in designing the heavy rock drill to drill deep and large diameter hole.
为大孔径深孔凿岩的重型液压凿岩机的研究与研发打下理论和实践基础。
The entering-rock problem of pouring pile through large-diameter hole drilling is always the biggest difficult problem in the fundamental construction of Guangxi.
大口径钻孔灌注桩的入岩问题，历来是广西基础施工中的一大难题。
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