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单词
concentric beam
释义
concentric beam
网络
同心光束
网络释义
1.
同心光束
若一光束中各光线本身或其延长线相 交于一点，这样的光束称为
同心光束
(
concentric beam
) 。(三要素：中心、主光线、立体角…
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更新时间：2024/11/16 0:35:20