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【单选题】
设f(k)和y(k)分别表示离散时间系统的输入和输出序列,则 所表示的系统是( )系统。A.
非线性时变因果
B.
线性时不变非因果
C.
线性时不变因果
D.
非线性时不变因果
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【单选题】Tokyo is one of those places where you can love and hate at the same time. In Tokyo there are always too many people in the places where I want to be. Of course there are too many cars. The Japanese d...
A.
it has a smaller population
B.
it is an international city
C.
it is more difficult to go somewhere on foot in Tokyo
D.
its people are more friendly and more polite
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