线性时不变系统输出中的自由响应的形式由( )决定。
A. 激励信号
B. 齐次微分方程的特征根
C. 系统起始状态
D. 以上均不对
查看答案
δ(t)*sin(t) *δ(t)的结果为( )
A. δ(t)
B. δ(2t)
C. sin(t)
D. cos(t)
x(t+6)*h(t-2)等于( )
A. x(t)*h(t)
B. x(t)*h(t-4)
C. x(t)*h(t+4)
D. x(t-6)*h(t+2)
线性常系数微分方程表示的系统,方程的齐次解称之____,特解称之____。
[单选]Which of the following statements is correct?
A. Both a competitive firm and a monopolist are price takers.
Both a competitive firm and a monopolist are price makers.
C. A competitive firm is a price taker, whereas a monopolist is a price maker.
D. A competitive firm is a price maker, whereas a monopolist is a price taker.
微信支付 
支付宝支付