某非正弦周期电流电路的电压为u=(来学网)sinωt+30sin(3ωt+30°)]V,电流i=[13.9+10sin(ωt+30°)+1.73sin(3ωt-30°)]A,则其三次谐波的功率P为( )W。
  • A.
    (来学网)25.95
  • B.
    (来学网)45
  • C.
    (来学网)51.9
  • D.
    (来学网)不确定