问题
单项选择题
For how many integers n is 2n=n2 ？（）
A.None
B.One
C.Two
D.Three
E.More than three
答案
参考答案：C
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For how many integers n is 2n=n2 ？（）
A.None
B.One
C.Two
D.Three
E.More than three
参考答案：C