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 theseDice, Sunshine, Sausages, Quail, Calliope, Explosion, Vacuum, Arcade, Peony, Desert, 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