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combination system of drilling
dril.
旋转钻和顿钻
混合钻井法
oil
混合钻井法
combination-system of drilling
expl.
冲击-回转钻进
钻头在孔底回转的同时,还通过一定的装置向其施加冲击力，以破碎岩石的钻进
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