题目

如图所示，在微型电扇的插头处连接一个小灯泡，用手快速拨动电扇叶片时，小灯泡发光，此原理与___________(选填“电动机”或“发电机”)的工作原理相同． 答案：【答案】发电机【解析】电扇的内部有磁铁和线圈，当微型电扇的插头处接一只小灯泡，线圈转动时，做了切割磁感线的运动，故能产生电流；此时微型电扇利用了电磁感应原理，与发电机的工作原理相同。The boy wanted to ride his bicycle in the street, but his mother told him _____. A. not to              B. couldn’t          C. not do it      D. do not to