直流电机有几种调速方法？_爱下问搜题

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问题问答题简答题

直流电机有几种调速方法？

答案

参考答案：

共有三种方法：

（1）在电枢电路中串接调速电阻使转速从基本转向下调；

（2）在励磁电路中串接电阻使转速从基本转向上调；

（3）调解电枢两端的电压使转速从基本转向下调。

补全对话，情景问答

问答配对。

                        A
( )1. What’s next to the school?
( )2. Why do you like dogs?
( )3. What do you like to eat?
( )4. Is there a supermarket near here?
( )5. What does your aunt do?
( )6. Where is the supermarket?
( )7. Where does your brother work?
( )8. What is the weather like there?
( )9. What’s your sister’s favorite music?
( )10. What do you want to be?

             B
A. It’s sunny.
B. Sorry. I don’t know.
C. A bookstore.
D. Hamburgers.
E. A musician or a reporter.
F. Because they’re friendly to me.
G. It’s on the Fifth Avenue.
H. Rock music, I think.
I. In a bank.
J. She’s a clerk.

判断题

净行中的“白面”在造型上既丑陋又有一定的美感。