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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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更新时间:2025/6/3 16:07:58