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【单选题】
第一过渡系的元素是( )A.第四周期IIIB~VIII~IIB B.第五周期IIIB~VIII~IIB C.镧系元素 D.锕系元素
A.
第四周期ⅢB~Ⅷ~ⅡB
B.
第五周期ⅢB~Ⅷ~ⅡB
C.
镧系元素
D.
锕系元素
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