英语词汇“index arm”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	index arm
释义	index arm index arm [′in‚deks ‚ärm] (navigation) On a marine sextant, a slender bar carrying the index; the bar pivots at the center of curvature of the arc of the sextant and carries the index and the vernier or micrometer.
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