【判断题】
三相异步电动机的同步转速与电源频率f、磁极对数p的关系是n1=60f/p。
【判断题】
三相异步电动机铭牌上的额定功率是当带有额定负载时的轴上输出的机械功率。
【判断题】
绕线式异步电动机转子串电阻起动是为了增大起动转距。
【单选题】
My ____________ are painting, football, music and photography.
【单选题】
When you make a self-introduction, you can tell what you do for a ______________.
【单选题】
You need money and time. _____________, you need to work hard.
【单选题】
He wants to find a ______________ with a school.
【单选题】
—Its nice meeting you.—_________________.
④
Thats very kind of you.
【单选题】
Its free, so you neednt ____________ money ____________ me.
【单选题】
He___________ score 100 on this coming test.