英语词汇“downhole drill”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典-现代词典

单词	downhole drill
释义	downhole drill downhole drill [′dau̇n‚hōl ′dril] (mining engineering) A hammer or percussive drill in which a reciprocating pneumatic piston is located immediately behind the drill bit and can follow and enter the bit down the hole, for minimizing energy losses.
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