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单词
grease spot photometer
释义
grease spot photometer
grease spot photometer
[
′grēs ‚spät fə′täm·ədər
]
(optics)
A photometer in which the light sources whose intensities are to be compared illuminate a thin sheet of opaque paper with a translucent spot at the center.
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更新时间:2025/11/21 16:53:45