单项选择题

There are two obvious characteristics in the Constitution. One is "checks and balances". Another is that the Constitution specifies the respective powers of the federal government and of the state government.
A、正确
B、错误

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问答题

解二项方程z^4+a^4=0(a>0)。

答案: 正确答案:k=0|k=1|k=2|k=3
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