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单词 ring micrometer
释义

Ring micrometer


(Astron.) See Circular micrometer, under Micrometer.

See also: Ring


ring micrometer


ring micrometer

[′riŋ mi′kräm·əd·ər] (optics) A flat, thin ring in the focal plane of a telescope; used to measure differences in right ascension and declination.
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