尼龙，铝合金，铜合金和钢铁，哪个最硬 铝合金和钢哪个更硬
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\u4e00\u822c\u6765\u8bb2\u94a2\u94c1\u786c\u5ea6\u66f4\u5927\u3002
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毫无疑义是钢铁最硬。
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