问题 问答题 简答题

光伏发电系统中常用的最大功率跟踪技术有哪些?

答案

参考答案:

1)功率匹配方法;

2)曲线拟合技术;

3)扰动和观察法;

4)导纳增量法。

选择题
阅读理解

阅读理解。

  I'm Mary. I have a piece of good news to tell you. My parents bought a new

flat in the centre of the city. The rooms are not big, but they are all comfortable.

There are more rooms than our old flat. I am excited because I have my own

bedroom. In the old flat, I share the bedroom with my brother.

  My favourite room in the new flat is my bedroom. I can be alone in it. It is

my own small world. I can listen to music, read comics and chat with my friends

on the phone. I can also look for things on the Internet and send e-mails to my

e-friends.

  Kitchen is my favourite room, too. I like helping my mother with the

cooking. She is not only a good teacher but also a good cook. She often teaches

me how to make some different kinds of dishes. She lived in Sichuan when she

was young. So she likes hot food and she can cook very delicious hot food.

1. What's Mary's new flat like?

A. Big and comfortable.

B. Small and not comfortable

C. Big but not comfortable

D. Small but comfortable

2. Mary can do the following things in the bedroom except _____.

A. play the piano                

B. chat with friends

C. send e-mails                

D. listen to music

3. Which room does Mary like best?

A. The kitchen                  

B. Her bedroom

C. The sitting room              

D. Both A and B

4. What does Mary's mother do?

A. a teacher                  

B. a cook

C. a housewife(家庭主妇)      

D. a worker

5. Where did Mary's mother live when she was a child?

A. The old flat                

B. The centre of the city

C. Sichuan                  

D. The new flat