英语词汇“percussion bit”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	percussion bit
释义	percussion bit percussion bit [pər′kəsh·ən ‚bit] (mechanical engineering) A rock-drilling tool with chisellike cutting edges, which when driven by impacts against a rock surface drills a hole by a chipping action.
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