亚洲网紅露点

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apertometer

[ ap-er-tom-i-ter ]

noun

Optics.
  1. an instrument for measuring the angular and numerical aperture of the objective lens of a microscope.
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亚洲网紅露点 History and Origins

Origin of apertometer1

First recorded in 1875鈥80; apert(ure) + -o- + -meter

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