• 2022-06-26
    设[img=37x25]1802fbbb07cef17.png[/img]是模拟基带信号,其功率为[img=67x29]1802fbbb10109bc.png[/img]。AM已调信号[img=176x25]1802fbbb1b2ca8e.png[/img]的调制效率是_____
    A: 1/9
    B: 1/18
    C: 1/6
    D: 1/3