世界上最坚硬的金属是什么?(要用于飞机之类的)
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![世界上最坚硬的金属是什么?(要用于飞机之类的)](/uploads/image/z/1483472-56-2.jpg?t=%E4%B8%96%E7%95%8C%E4%B8%8A%E6%9C%80%E5%9D%9A%E7%A1%AC%E7%9A%84%E9%87%91%E5%B1%9E%E6%98%AF%E4%BB%80%E4%B9%88%3F%EF%BC%88%E8%A6%81%E7%94%A8%E4%BA%8E%E9%A3%9E%E6%9C%BA%E4%B9%8B%E7%B1%BB%E7%9A%84%EF%BC%89)
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