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单词 apertometer
释义 apertometer|æpəˈtɒmɪtə(r)|
[f. L. apert-us open + -o-meter.]
An appliance attached to a microscope for determining the angular aperture of object-glasses.
1880Nature XXI. 433 Some remarks on the apertometer.1881Athenæum 26 Nov. 707/3 An Abbe apertometer of dense glass for measuring apertures up to 1·50 N.A.
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