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单词
shadow photometer
释义
shadow photometer
shadow photometer
[
′shad·ō fō′täm·əd·ər
]
(engineering)
A simple photometer in which a rod is placed in front of a screen and two light sources to be compared are adjusted in position until their shadows touch and are equal in intensity.
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更新时间:2025/7/24 5:59:43