单选题 将R=8W与wL=2W串联后，接到uS=[40+30sin(3wt-30°)]V的电压源，则电路的电流i为 A、3sin(3wt-66.9°)A B、[5+3sin(3wt-66.9°)]A C、[5+3.66sin(3wt-44°)]A D、[5+3sin(3wt-83.1°)]A