求一篇初中物理科普短文.200字以内!(字尽量少些)
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![求一篇初中物理科普短文.200字以内!(字尽量少些)](/uploads/image/z/6012009-9-9.jpg?t=%E6%B1%82%E4%B8%80%E7%AF%87%E5%88%9D%E4%B8%AD%E7%89%A9%E7%90%86%E7%A7%91%E6%99%AE%E7%9F%AD%E6%96%87.200%E5%AD%97%E4%BB%A5%E5%86%85%21%EF%BC%88%E5%AD%97%E5%B0%BD%E9%87%8F%E5%B0%91%E4%BA%9B%EF%BC%89)
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