• 2022-05-28
    3.已知信号 x(t) 的波形如题3图所示,可以表示为 ( )[img=547x283]180361a696eaaf8.png[/img]
    A: (A) [img=118x25]180361a69f51404.png[/img]
    B: (B)[img=87x25]180361a6a7b5d4a.png[/img]
    C: (C)[img=159x25]180361a6afaaaf6.png[/img]
    D: [img=128x25]180361a6b8852fe.png[/img]