为什么说凸透镜对任何一束光都有会聚作用 知乎 Template




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Try and sketch some of theseBustle, Zephyr, Romper, Bubbles, Water buffalo, Loafers, Thermometer, X-ray, Cuttlefish, Gravy, view more ideas


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tomski为什么说凸透镜对任何一束光都有会聚作用 知乎 coloring