英语词汇“hollow-rod drilling”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	hollow-rod drilling
释义	hollow-rod drilling hollow-rod drilling [′häl·ō ‚räd ′dril·iŋ] (engineering) A modification of wash boring in which a check valve is introduced at the bit so that the churning action may be also used to pump the cuttings up the drill rods.
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