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单词
foot-candle
释义
WordReference Random House Unabridged Dictionary of American English © 2024
foot-can•dle
(fŏŏt
′
kan
′
dl),
USA pronunciation
n.
[
Optics.
]
Optics
a unit of illuminance or illumination, equivalent to the illumination produced by a source of one candle at a distance of one foot and equal to one lumen incident per square foot.
Abbr.:
FC
Also,
foot
′
can
′
dle.
1905–10
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更新时间:2025/2/23 10:31:15