怎样作一个简易的望远镜
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![怎样作一个简易的望远镜](/uploads/image/z/10483869-21-9.jpg?t=%E6%80%8E%E6%A0%B7%E4%BD%9C%E4%B8%80%E4%B8%AA%E7%AE%80%E6%98%93%E7%9A%84%E6%9C%9B%E8%BF%9C%E9%95%9C)
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