1. No such limitation is placed on an alternating-current machine; here the only requirement is relative motion, and since a stationary armature and a rotating field system have numerous advantages, this arrangement is standard practical for all synchronous machines rated above a few kilovolt-amperes.
交流电机不受这种控制，唯一的要求是相对运动，由于固定电枢和旋转磁场具有许多优点，这种安排对于额定容量超过几千伏安的同步电机来说是标准的实用。
出纳的工作内容2. For large motors, therefore, a pha-wound rotor is ud, with the winding connected at one end to each other and at the other end to slip-rings, thus enabling the resistance of the rotor to be varied at will, providing a greater starting torque and some speed control.
因此，对于大型的电动机来说，一般采用相绕组转子，绕组一端互相连接，另一端接于滑环上，这样可随意改变转子的电阻，提供一个较大的启动转矩，并且可以适当地控制速度。
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3. The resistance of any length of a conducting wire is easily measured by finding the potential difference in volts between its ends when a known current is flowing.
已知导线中的电流，只要求出导线两端电位差的伏特数，这样不难测出任意长度导线的电阻。
叶诗文兴奋剂铁证4. A diode placed in a circuit acts like a valve, allowing current to flow in only one direction.
装在线路中的二极管就像一个允许电流向一个方向流动的阀门。
5．A few years later he was able to take out his first two patents for high-frequency AC generators and transformers.
大学英语六级词汇几年后，他获得了发明高频交流发电机和变压器的专利，这是他获得的最初两项专利。
6. The are the field winding, which produces the flux density, and the armature winding, in which the “working” emf is induced.
环保材料 英文这些是励磁绕组和电枢绕组，励磁绕组建立磁场，电枢绕组产生感应电动势。7.Pure science has been subdivided into the physical science, which deals with the facts and relations of the physical world, and the biological sciences, which investigate the history and working of life on this planet.
个人陈述范文理论科学可以细分为物理科学和生物科学，物理科学处理客观世界的事实和关系，生物科学研究星球上生命的历史和生活方式
8. The reason that a neutral body is attracted by a charged body is that, although the neutral body is neutral within itlf, it is not neutral with respect to the charged body, and the two bodies act as if oppositely charged when brought near each other.turtle
caching中性体能够被带电体吸引的原因是，尽管中性体本身是中性的，但当它接触带电体时就不是中性的了，它们就会像电荷相反的导体互相靠近时一样互相吸引。fournier
