負焦距 的英文怎麼說
中文拼音 [fùjiāojù]
負焦距
英文
retrofocus-
Abstract : it is proved that a small circular aperture has the positive and minus focal distances, and the research experiments for small aperture glasses are introduced concisely
文摘:提出了證明小圓孔具有正、負焦距的一種方法,簡要地介紹了關于小孔眼鏡的實驗研究
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