如何用纯几何法证明共焦点椭圆、双曲线的这一光学性质? 知乎 Template




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Try and sketch some of theseWanderer, Bark, Yeast, Owl, Whale, Jazz band, Cowgirl, Spatula, Shuffleboard, Slack rope, view more ideas


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sketch #3260 sorry to over comment on your blog .haha. I 'm just flnpiipg through your posts after finding you through the KCWC. Recently I had this huge urge to learn to sketch with black ink pens. This cloud drawing is exactly the thing that I feel the need to put on paper. : )


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tomski如何用纯几何法证明共焦点椭圆、双曲线的这一光学性质? 知乎 coloring