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micrometer screw /ˈmaɪkɹəʊmˌiːtə ˈskɹuː/ n

中文：微调测微螺旋

中文 · 微调测微螺旋Español · tornillo micrométricoFrançais · bouton de réglage du micromètre optique
Meaning：Screw with a head graduated in minutes that is turned to set the index arm precisely.
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Theodolite Sextant

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