【单选题】Dear Mr. Ridge, It was good of you (147) such kind of Joint Operation and I deeply appreciate it. However, I feel that I must check a few things out for mutual benefits. The communications technical s...
【简答题】三相异步电动机的额定功率是额定状态时电动机转子轴上 功率,额定电流是满载时定子绕组的 电流,其转子的转速 旋转磁场的速度。
【简答题】Describe a piece of work you did fairly quickly. You should say: what work it was why you did it quickly how easy or difficult it was and explain what the result was. [You will have to talk about the ...
【简答题】三相异步电动机的额定功率是额定状态时电动机转子轴上输出的机械功率,额定电流 是满载时定子绕组的 电流,其转子的转速 旋转磁场的速度。
【单选题】It was very of you to let us know you were going to be late
【单选题】早在公元前4世纪末,我国的《墨经》中就有关于力和运动的一些见解,如“绳下直,权重相若则正矣。收,上者愈丧,下者愈得”,这句话所描述的与下述物理现象相似。如图,一根跨过定滑轮的轻绳两端各悬挂一重物,当两重物质量均为m时,系统处于平衡状态。若减小其中一个重物的质量,系统就无法保持平衡,上升的重物减小的质量Δm越多,另一个重物下降的加速度a就越大。已知重力加速度为g,则a与Δm的关系图象可能是
【单选题】It was careless of you to the story that his rich relative would pay you the debt. [ ]
【简答题】三相异步电动机的额定功率是额定状态时电动机转子轴上 功率,额定电流是满载时定子绕组的 电流,其转子的转速小于旋转磁场的速度。