舵机的控制时,PWM周期的初始化函数是TIM3_PWM_Init(200,7200);那么让通道二的PWM的高电平的宽度是2ms,那么占空比设置函数应该是哪个A.TIM_SetCompare1(TIM3,10);B.TIM_SetCompare1(TIM3,20);C.TIM_SetCompare2(TIM3,10);D.TIM_SetCompare2(TIM3,20);的答案是什么.用刷刷题