• 2022-06-07
    已知连续实信号[img=31x25]180370ca48bd282.png[/img]的频谱为[img=48x25]180370ca51a3fab.png[/img],则信号[img=85x25]180370ca5a59137.png[/img]的频谱为
    A: [img=155x27]180370ca683d6c8.png[/img]
    B: [img=141x27]180370ca76659dc.png[/img]
    C: [img=131x27]180370ca8455cf1.png[/img]
    D: [img=139x27]180370ca8c95f48.png[/img]
  • 举一反三