1.比较铜与铝性能的相同点与不同点.2.请归纳铁与钢在促进社会进步中的作用.
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![1.比较铜与铝性能的相同点与不同点.2.请归纳铁与钢在促进社会进步中的作用.](/uploads/image/z/4366014-6-4.jpg?t=1.%E6%AF%94%E8%BE%83%E9%93%9C%E4%B8%8E%E9%93%9D%E6%80%A7%E8%83%BD%E7%9A%84%E7%9B%B8%E5%90%8C%E7%82%B9%E4%B8%8E%E4%B8%8D%E5%90%8C%E7%82%B9.2.%E8%AF%B7%E5%BD%92%E7%BA%B3%E9%93%81%E4%B8%8E%E9%92%A2%E5%9C%A8%E4%BF%83%E8%BF%9B%E7%A4%BE%E4%BC%9A%E8%BF%9B%E6%AD%A5%E4%B8%AD%E7%9A%84%E4%BD%9C%E7%94%A8.)
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