将一叠纸一侧垂直下压,另一侧自然悬垂,则纸页边缘形成的包络线是什么? 知乎 Template




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tomski将一叠纸一侧垂直下压,另一侧自然悬垂,则纸页边缘形成的包络线是什么? 知乎 coloring