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单词
drill string
释义
WordReference Random House Unabridged Dictionary of American English © 2024
drill
′
string′,
Mining, Mechanical Engineering
(on a drill rig) the assemblage of drill pipes that link the drill bit to the mechanism that imparts rotary or reciprocating motion.
1695–1705
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更新时间:2024/9/20 14:52:58