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For the 17 years my life was very happy. Then the first sad thing happened. My mother became very ill. Just before she died, she asked Elizabeth and me to go to her room. She said, “Victor and Elizabeth, I’m very happy because you love each other, and because one day you’ll get married. Everyone in the family loves you, Elizabeth. Will you take my place in the family, my dear? I can die happy if you look after them when I have gone.” My mother died and we were very sad, because we loved her so much. Elizabeth was brave and helped us; her sweet smile gave us some happiness in the unhappy days after my mother’s death. The time came for me to go to university(大学). I didn’t want to leave my sad family, but we all knew that I should go. It was hard to leave, too, because the parents of my good friend Henry would not let him go to university with me. So I had gone alone. On my first day at university I met Professor Waldman. He gave a wonderful talk to all the students. He ended his talk by saying, “Some of you will become the greatest scientists of tomorrow. You must study hard and discover everything that you can.” After the professor’s talk, I thought very carefully. I remembered the storm when I was 15; I remembered how the lightning had destroyed the tree. From then on, I wanted to use electricity to help people, and I wanted to discover the secrets of life. I decided to work on these two things. I started to work the next day. I worked very hard and soon Professor Waldman and I realized that I could learn to be a very good scientist. The professor and other important scientists helped me. I was interested in my work and I did not take one day’s holiday during the next two years. After two years, I had discovered many things and I built a scientific machine that was the best in the university. My machine would help me answer the most important question of all. How does life begin? Is it possible to put life into dead things? To answer these questions about life I had to learn first about death. I had to watch bodies from the moment when they died and the warm life left them. In the hospital and in the university, I watched the dying and the dead. Day after day, month after month, I followed death, so it was a dark and terrible time. I built a tall mast(桅杆)about 150 metres high, which is higher than the tallest building in the city, to catch lightning and send the electricity down to my machine in the lab. I believed I could use that electricity to give life to things that were dead. Then one day, the answer came to me. Suddenly I was sure that I knew the secret of life. 小题1:Which of the following is TRUE according to the passage? A.Elizabeth married shortly after Victor’s mother died. B.Elizabeth was a brave girl who loved Victor and gave him much help. C.Victor’s mother was very angry when she knew he loved Elizabeth. D.Victor did not want to leave his family because his mother died not long before. 小题2:Victor did all the following during his research in the university EXCEPT that ______. A.he discovered many things and built a scientific machine B.he learnt much about death both in the hospital and in the university C.he worked hard and took only one day’s holiday during the next two years D.he built a tall mast to catch lightning and send the electricity down to the lab 小题3:According to the writer, the secret of life is to _______. A.give life to things that were dead B.build the best machine to learn about death C.use electricity to help others D.become the greatest scientist of tomorrow 小题4:Which is the correct order about the life of Victor? ① Victor’s mother passed away. ② Victor got help from the professor and other scientists. ③ Victor went to university and attended the professor’s talk. ④ Victor found the answer to giving life to things that were dead. ⑤ Victor experienced a storm, seeing the lightning destroying the tree. A.①②③④⑤ B.⑤①②④③ C.①③②⑤④ D.⑤①③②④
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【单选题】《消费者权益保护法》规定经营者提供商品或者服 务有欺诈行为的,应当按照消费者的要求增加赔偿消费者购买商品的价款或者接受服务的费用的( )倍的损失。
A.
B.
C.
D.
【多选题】比较而言,下列哪个器件驱动功率最小( )。
A.
. IGBT
B.
. MOSFET
C.
. GTR
D.
. GTO
【单选题】1751年,科学家、政治家富兰克林在费城创办了第一所( ),这是美国中等教育发展进入新阶段的标志。
A.
文实中学
B.
公立中学
C.
实科中学
D.
文士中学
【多选题】以下关于电力晶体管GTR和电力场效应晶体管MOSFET正确的是
A.
GTR比MOSFET开关速度快
B.
GTR比MOSFET开关速度慢
C.
GTR比MOSFET通流能力强
D.
GTR存在二次击穿问题,MOSFET热稳定性好
【判断题】电力MOSFET的开关速度比GTR的快,但电流容量较小。()
A.
正确
B.
错误
【简答题】GTO、GTR、MOSFET、IGBT分别表示 、 、 、
【单选题】GTR、SCR、GTO、TRIAC、MOSFET、IGBT中,哪些是开关电源中变压器常用的驱动元件()。
A.
GTO和GTR;
B.
TRIAC和IGBT;
C.
MOSFET和IGBT;
D.
SCR和MOSFET;
【简答题】IGBT、GTR、GTO和电力MOSFET的驱动电路各有什么特点?
【单选题】1751年,在美国创办了第一所文实中学的教育家是( )。
A.
杰斐逊
B.
富兰克林
C.
林肯
D.
贺拉斯·曼
【简答题】IGBT,GTR,GTO和电力MOSFET的驱动电路各有什么特点?
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