【简答题】异步电机的定子铁心和转子铁心都用硅钢片叠成,为什么同步电机的定子铁心用硅钢片叠成,而转子铁心却用整块钢材料做成?
【简答题】It is up to you to decide what you are going to read this week. You can read: 1)two or three chapters of an English book; 2) English stories; 3) two or three articles from English newspapers or maga...
【简答题】异步电机的定子铁心和转子铁心都用硅钢片叠成,为什么同步电机的定子铁心用硅钢片叠成,而转子铁心却用整块钢材料做成?
【判断题】质量为 m 的质点以速度 v 沿一直线运动,则它对空间任一点的角动量都为零.
【简答题】It is up to you to decide what you are going to read this week. You can read: 1) two or three chapters of an English book; 2) English stories; 3) two or three articles from English newspapers or mag...
【判断题】Rhetorical questions are questions for which the answer is obvious or already known. It is used to make the readers think.
【单选题】质量为m的质点以速度 v 沿一直线运动,则它对直线外垂直距离为d的一点的角动量大小是
【简答题】三相异步电机定子和转子之间须有_____。