According to the composition, metal alloys are grouped into two classes:（）, and（）metals
A.White
B.Ferrous
C.Nonferrous
D.Noble
正确答案：Ferrous；Nonferrous
According to the composition, metal alloys are grouped into two classes:（）, and（）metals
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Stainless steels are divided into three classes on the basis of the predominant phase constituent of the microstructure:（）,（）, o
（）is believed “the most glamorous metal in the world”
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