如图所示电路中,电源电压u=31lsin100πt(V),A、B间接有“220V 440W”的电暖宝、“220V 220W”的抽油烟机、交流电压表及保险丝.下列说法正确的是( )
He is so determined a boy that he must have enough courage to ____ (克服)the difficulty.