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单词 Jamin refractometer
释义 Jamin refractometer
[jǝ`mēn ´rē´frak`täm·ǝd·ǝr]
OPTICS
An instrument for measuring the index of refraction of a gas in which two light beams from a common source are each passed through an evacuated tube and recombined, and the displacement of interference fringes is noted as gas is slowly admitted into one of the tubes.
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