问题 问答题 简答题

二极管按用途分有哪些类型?

答案

参考答案:二极管按用途分有:1)普通二极管;2)整流二极管;3)开关二极管;4)稳压二极管;5)变容二极管;6)隧道二极管;7)发光二极管

单项选择题
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     When I met him, I had a lot of anger inside of me. I've lived my whole life in Spanish Harlem, but in my

neighborhood, there are shoot-ups all the time. I know kids who have been shot or beaten up. I have friends

who ended up in prison. I could have ended up that way, too, but Mr. Clark wouldn't let that happen.

     Mr. Clark worked long hours, making sure I did my work. My grades rose. In fact, the scores of our

whole class rose. One day, he took our class to see The Phantom of the Opera, and it was the first time some

kids had ever been out of Harlem. Before the show, he treated us to dinner at a restaurant and taught us not to

talk with our mouths full. We did not want to let him down.

     Mr. Clark was selected as Disney's 2000 Teacher of the Year. He said he would draw three names out of

a hat; those students would go with him to Los Angeles to get the award. But when the time came to draw

names, Mr. Clark said, "You're all going."

     On graduation day, there were a lot of tears. We didn't want his class to end. In 2001, he moved to Atlanta,

but he always kept in touch. He started giving lectures about education, and wrote a bestselling book based on

his classroom rules, The Essential 55. In 2003, Mr. Clark took some of us on a trip to South Africa to deliver

school supplies and visit orphanages (孤儿院). It was the most amazing experience of my life. It's now my

dream to one day start a group of women's clubs, helping people from all backgrounds.

1. Without Mr. Clark, the writer _____. [ ]

A. might not have won the prize

B. might have been put into prison

C. might have joined a women's club

D. might not have moved to Atlanta

2. The Essential 55 is _____. [ ]

A. a show

B. a speech

C. a book

D. a classroom rule

3. How many students' names were finally drawn out of a hat by Mr. Clark?[ ]

A. None.

B. Three.

C. Fifty-five.

D. All.

4. In the passage, the writer intends to tell us that _____. [ ]

A. a good teacher has a good influence on his or her students

B. Mr. Clark helped to set up a group of women's clubs

C. a good teacher can help raise his or her students' scores

D. Mr. Clark went to South Africa because he liked travelling