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实现led矩形均匀照明的透镜设计lens design for uniform illumination of rectangle area with led李竞摘要随着大功
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t lighting for developing countries (free download) 183:2008: definition of the cut-off of vehicl
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己的认识。 一应急照明的名称和分类 从五十年代始，我国一直沿用“事故照明”这个名词。为了和cie和英美等国通用的“emergency lighting”这个词接口，并考虑到更为确
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