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【多选题】
以下关于Matlab提供的离散叶变换函数描述,正确的是:( )A.
fft(.)只能完成长度为2的整数次幂的序列的离散叶变换。
B.
ifft(.)用于实现信号的离散叶逆变换。
C.
fft(x,n)是将序列x的频谱长度扩充n倍。
D.
fftshift(.)可以将fft计算的信号频谱零频搬移到序列中心。
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反馈参考答案：
举一反三
【简答题】n. 观众,听众
【简答题】n. 观众;听众;读者
【简答题】n. 听众,观众
【单选题】______ in the United States, St. Louis has now become the 24th largest city.
A.
Being the fourth biggest city
B.
It was once the fourth biggest city
C.
Once the fourth biggest city
D.
The fourth biggest city it was
【简答题】In almost every big university（大学）in the United States, football is a favourite sport. American football is different. Players sometimes kick the ball, but they also throw the ball and run with it. Th...
【简答题】n. 听众,观众,读者
【单选题】According to the passage, the United States______.
A.
has begun to give much attention to football
B.
is fond of playing football
C.
has won the football World Cup
D.
is getting sick of football
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