• 2022-07-29
    若正弦交流电压和电流的最大值分别是Um、Im时,则视在功率的表达式为()
    A: Umlm/2
    B: UmIm/{**{1579111756575_22_70_48.png}**}
    C: {**{1579111756575_22_70_48.png}**}UmIm
    D: {**{1561013008156_18_70_48.png}**}UmIm