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冲击回转钻进
eng.geol. percussion rotation drilling; percussive-rotary drilling
tech. combination drilling; percussion-rotation drilling; pounding-rotary drilling
冲击-回转钻进
el. percussive-rotary drilling
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
expl. percussion-rotary drilling; percussive-rotary drilling; combination drilling; combination-system of drilling
冲击回转钻进: 8 phrases in 2 subjects
Engineering geology5
Technology3

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