• 2022-06-12
    ‎已知信号x(t)如图所示,则x(2t)的波形为( )。‍‎[img=337x179]18031af61b4baac.png[/img]‍
    A: [img=337x179]18031af6257c161.png[/img]
    B: [img=337x179]18031af62fde9c5.png[/img]
    C: [img=337x179]18031af63a0c825.png[/img]
    D: [img=337x179]18031af645050ef.png[/img]