题目内容
(请给出正确答案)
[单选题]
Then _____ of that time when he was cowboy
A. Comes the memory
B. came the memory
C. the memory comes
D. the memory came
查看答案
如果结果不匹配,请 联系老师 获取答案
A. Comes the memory
B. came the memory
C. the memory comes
D. the memory came
已知f1(t)=tε(t),f2(t)=ε(t)一ε(t一2),求y(t)=f1(t)*f2(t一1)*δ’(t一2)。
若f1(t)=e-atu(t),f2(t)=sintu(t),求f1(t)*f2(t).
A.don't include
B.can't include
C.aren't included
D.haven't included
已知f(t)=e2tε(﹣t),h(t)=ε(t一3),计算卷积y(t)=f(t)*h(t),并绘出y(t)的波形。
AR(2)模型t t t t e Y Y Y +-=-- 215.04.0,其中64.0)(=t e Var ,则=)(t t e Y E ()。
A 0
B64.0
C16.0
D2.0