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【单选题】
下面哪种说法不正确？A.
信号可以分为随机信号和确定信号两大类
B.
线性系统可以是时不变的，也可以是的
C.
零输入响应是仅由初始状态所引起的响应
D.
线性时不变连续系统的数学模型是常系数线性差分方程
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