... percussion rotary boring 冲积钻钻探 rotary percussion boring 旋转冲击钻探 ; 旋转冲击式钻孔 ; 旋式孔 Machine，percussion boring 撞击式钻探机 ...
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percussive rotary drilling
... percylite 氯铜铅矿 percussive rotary drilling 冲积钻钻探 percussion rotary boring 冲积钻钻探 ...
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