... rotary percussion drilling 旋转冲唤钻进 ; 旋转冲击钻井 percussion drilling machine 冲唤钻机 ; 冲击式钻机 percussion drilling system 冲魂井方法 ...
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percussion drilling machine detail 冲唤钻机
percussion n drilling machine 冲唤钻机
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When large dismeter water well is constructed in cobble and boulder strata drilling by percussion machine is not proper to be used as limited by condition.
卵砾石地层钻进是钻探的难题之一，不仅钻进速度低，钻头的使用寿命短，而且钻探成本高。
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