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【单选题】
下列关于金属材料描述正确的是
A.
通常把金属材料分为有色金属、黑色金属和稀有金属材料三大类
B.
相对于黑色金属，有色金属的种类、产量和规模都比较大
C.
轻金属的性质较为活泼，一般用熔盐电解或真空冶金的方法来进行冶炼
D.
稀有金属是指金、银、钛、镭、稀土等在地壳中含量稀少的金属元素
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