“percussive rotary drilling rig”的概念、定义、翻译、参考文献-科学参考

单词	percussive rotary drilling rig
释义	percussive rotary drilling rig Encyclopedia 工学探矿机械释 percussive rotary drilling rig冲击回转钻机用冲击和回转两种方式同时破碎岩石的钻机。
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