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【单选题】
连续时间信号f(t)的最高频率 ;若对其取样,并从取样后的信号中恢复原信号f(t),则奈奎斯特间隔和所需低通滤波器的截止频率分别为( )。A.
10-4s，104Hz
B.
10-4s，5×103Hz
C.
5×10-3s，5×103Hz
D.
5×10-3s， 104Hz
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