“hollow-rod drilling”的概念、定义、翻译、参考文献-科学参考

单词	hollow-rod drilling
释义	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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