为什么饮料瓶一般都是圆形的,牛奶盒都是方形的?
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![为什么饮料瓶一般都是圆形的,牛奶盒都是方形的?](/uploads/image/z/4510553-41-3.jpg?t=%E4%B8%BA%E4%BB%80%E4%B9%88%E9%A5%AE%E6%96%99%E7%93%B6%E4%B8%80%E8%88%AC%E9%83%BD%E6%98%AF%E5%9C%86%E5%BD%A2%E7%9A%84%2C%E7%89%9B%E5%A5%B6%E7%9B%92%E9%83%BD%E6%98%AF%E6%96%B9%E5%BD%A2%E7%9A%84%3F)
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