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单词 foot-candle
释义
foot-can·dle (ftkăndl)
n. Abbr. fc or ft-c
A unit of measure of the intensity of light falling on a surface, equal to one lumen per square foot and originally defined with reference to a standardized candle burning at one foot from a given surface.
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更新时间:2025/1/8 15:05:49