题目

如图所示，a、b两个闭合正方形线圈用同样的导线制成，匝数均为10匝，边长la＝3lb，图示区域内有垂直纸面向里的匀强磁场，且磁感应强度随时间均匀增大，不考虑线圈之间的相互影响，则( )A. 两线圈内产生顺时针方向的感应电流B. a、b线圈中感应电动势之比为9∶1C. a、b线圈中感应电流之比为3∶4D. a、b线圈中电功率之比为3∶1If I __________the chance, I ________ the journey. but I was busy at that time.A. would have had , had enjoyed B. had had , would have enjoyedC. had , enjoyed D. had, would have