题目内容

要改变异步电动机的转向,方法是改变三相定子电流的____。

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频敏变阻器的功能是改善____异步电动机的起动性能。

一台 6 极三相异步电动机接50Hz 的三相对称电源,其 s=4%,则此时转子转速为r/min,定子旋转磁通势相对于转子的转速为r/min。

电动机三相定子绕组在空间位置上彼此相差________ 。

Section ADirections: This section is to test your ability to understand short dialogues. There are 5 recorded dialogues in it. After each dialogue, there is a recorded question. Both the dialogues and questions will be spoken only once. When you hear a question, you should decide on the correct answer from the 4 choices marked A), B), C)and D)given in your test paper. Then you should mark the corresponding letter on the Answer Sheet with a single line through the center.[音频]Example: You will hear:You will read: A)New York City. B)An evening party.C)An air trip.D)The man’s job.What does the man advise the woman to do?

A. Buy a less expensive car.
B. Make a price comparison.
C. Borrow money from the bank.
D. Wait until the price goes down.