题目内容:
contain a large percentage of iron such as the steels and cast irons.
A.ferrous metal and alloys
B.nonferrous metal and alloys
C.rare metal and alloys
D.precious metal and alloys
参考答案:
contain a large percentage of iron such as the steels and cast irons.
A.ferrous metal and alloys
B.nonferrous metal and alloys
C.rare metal and alloys
D.precious metal and alloys