“ring micrometer”的概念、定义、翻译、参考文献-科学参考

单词	ring micrometer
释义	ring micrometer [`riŋ mi`kräm·ǝd·ǝr] ^OPTICS A flat, thin ring in the focal plane of a telescope; used to measure differences in right ascension and declination.
随便看	background program background radiation background reflectance background returns background signal back gutter backhand welding back-haul back hearth backhoe back holes backing backing board backing brick backing cloth backing deals backing off backing plate backing pump backing ring backing space backing-space technique backing storage pachycephalosaur Pachycephalosauridae

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