单项选择题

如图(b)所示系统中,激励信号f(t)的傅里叶变换如图(a)所示,那么y(t)的频谱图正确的是_____。

A、
B、
C、
D、

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According to the passage, the writer looks upon the anti-smoking wall-builders' actions______.A.optimisticallyB.pessimisticallyC.unconcernedlyD.skeptically
A.A.optimistically
B.pessimistically
C.unconcernedly
D.skeptically
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According to the author, 'Super Slow' training______.A.has been misunderstood for decadesB.has been widely accepted recentlyC.has been the basis of weight liftingD.has become the nucleus of aerobics
A.A.has
B.has
C.has
D.has
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