题型:名词解释 如图所示,由六根相同的金属棒组成了一个“6”字形的框架,每根金属棒长为L,电阻为R,匀强磁场的宽度也为L.设框架在通过磁场过程中以速度v做匀速直线运动,从ab进入磁场开始计时,f、c两点的电势差Ufc随距离变化的图象正确的是( )A.B.C.D. 查看答案
题型:名词解释 He sold newspapers in spare time so that he can earn more money for his family.______ he sold newspapers in spare lime. 查看答案