抛物线的光学性质:所有从焦点�出的光经过反射会平行射�远方。怎么用平面几何证明? 知乎 Template




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tomski抛物线的光学性质:所有从焦点�出的光经过反射会平行射�远方。怎么用平面几何证明? 知乎 coloring