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（）metals, by definition, have melting points are above 2000℃, some of them reaching as high as 3426℃.
（）metals, by definition, have melting points are above 2000℃, some of them reaching as high as 3426℃.
正确答案：Refractory
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材料概论
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Metal processing techniques are normally preceded by refining, alloying and often heat-treating process.
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（）alloys, in which, iron is the principal constituent, include steels and cast irons.