–Could you please tell me ______? –Of course. About ten minutes’ ride. A. how far is it from the school B. how far it is from the school C. how often you go to the school
【单选题】如图所示 , 带负电荷的摆球在一匀强磁场中摆动 , 匀强磁场的方向垂直纸面向里.摆球在 A 、 B 间摆动过程中 , 由 A 摆到最低点 C 时 , 摆线拉力大小为 F 1 , 摆球加速度大小为 a 1 ;由 B 摆到最低点 C 时 , 摆线拉力大小为 F 2 ,摆球加速度大小为 a 2 , 则 ( )