经过整流后最接近直流的整流电路是（）。A.单相全波电路； B.单_爱下问搜题

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问题单项选择题

经过整流后最接近直流的整流电路是（）。

A.单相全波电路；

B.单相桥式电路；

C.三相半波电路；

D.三相桥式电路。

答案

参考答案：D

完形填空

完形填空
When Wang Hai went to Yucai Middle School two years ago, he worked hard and did very well in his lessons. He was also 1 in sports. He ran to school every day to build up his 2 . His parents were very 3 him and bought him a computer as a birthday present. However, something began to change. He stopped 4 early and never ran to school any more. He 5 his interest in studying. One day in the middle of the night, Wang Hai's mother discovered the cause of the 6 . He played computer games till midnight. It had a 7 effect(影响) on him and must be stopped. The next day Mother had a serious talk with Wang Hai. 8 taking the computer away, she told him he was 9 enough to control himself. Wang Hai was happy he had a wonderful mother and 10 not to do that again.
( )1. A. worried ( )2. A. body ( )3. A. surprised at ( )4. A. getting up ( )5. A. forgot ( )6. A. choice ( )7. A. good ( )8. A. Instead of ( )9. A. strong ( )10.A. printed	B. unusual B. legs B. strict with B. putting up B. lost B. change B. bad B. Instead B. weak B. protected	C. active C. arms C. angry with C. getting on C. found C. chant C. useful C. Because of C. old C. provided	D. nervous D. head D. satisfied with D. putting on D. took D. chance D. useless D. Because D. young D. promised

选择题

— What's the matter with the man hanging his head there?

— Well, if you _____ know, he was caught stealing my bike.

A．must

B．may

C．can

D．shall