The amount of light emitted by one candle that falls on one square foot of surface one foot away is called a lumen (lm).
英
美
- 光的量是由一支蜡蠋由一英呎的距离照在一平方英呎的地方做为计量单位:流明。
- 今日热词
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- 深远海浮式风电平台 - deep-sea floating wind power platform
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- 京雄高速公路 - Beijing-Xiongan expressway
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- 农业及相关产业增加值 - the added value of agriculture and related industries