单项选择题

计算N=2M (M为整数)点的按时间抽取基-2FFT每一级有()个蝶形运算。

A．M
B．M/2
C．N
D．N/2

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信息共享是解决供应链中牛鞭效应的最有效方法。
正确
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答案：正确

This view assumes that rich societies will invest in environmental care. But is this right? Do things get better or worse as we get richer? Here the Stockholm declaration is ambiguous. (CET6-2015.12)
A、description
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D、opinion

答案： statement