（）alloys, in which, iron is the principal constituent, include steels and cast irons.
正确答案：Ferrous
（）alloys, in which, iron is the principal constituent, include steels and cast irons.
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The（）steels are highly resistant to corrosion（rusting）in a variety of environments, especially the ambient atmosphere.
（）metals, by definition, have melting points are above 2000℃, some of them reaching as high as 3426℃.
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