问题
问答题 简答题
光发送机对驱动电路的要求有哪些？
答案
参考答案：
（1）驱动电路应该是一个能够提供相当大驱动电流的恒流源；
（2）驱动电路要有相当高的驱动速度；
（3）驱动电路应该使光源器件具有稳定的输出特性。
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光发送机对驱动电路的要求有哪些？
参考答案：
（1）驱动电路应该是一个能够提供相当大驱动电流的恒流源；
（2）驱动电路要有相当高的驱动速度；
（3）驱动电路应该使光源器件具有稳定的输出特性。
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| I live in a big city. It’s noisy and dirty and I always feel very 1 . At the weekends I like to leave the city and get some 2 air and have a good rest. A few weeks ago I decided to go see my 3 . I was really looking forward to it. My parents live a long way away. I went to see them with James, a friend of _4 . And we drove there on Friday night. In the middle of the trip it began to rain. The roads became very wet and it was difficult to 5 . We 6 home just after midnight, feeling very tired. The next morning it was still raining. James took his car to a garage(汽车修理站)which was very good. In the afternoon the 7 got better. We wanted to go for a drive. My parents_8 us their car. But their car wasn’t very goo  d. It didn’t 9 on the way. How 10 we were! We had to ring up the garage. “Oh”, they said, “your car won’t 11 until tomorrow. ”So it wasn’t 12 for us to go for a drive. We had to stay at my parents’ home all day. On Sunday my mother 13 a heavy box on her foot and we had to hire(雇佣)a taxi 14 her to hospital. When James and I drove back home on Sunday afternoon, we got stuck(堵车)in a car accident. Oh, my God! Next time if 1 want a rest, I’11 stay 15 . | |||
| ( )1. A. energetic ( )2. A. cold ( )3. A. classmates ( )4. A. I ( )5. A. ride ( )6. A. arrived at ( )7. A. sky ( )8. A. 1ent ( )9. A. move ( )10. A. 1uckily ( )11. A. be repaired ( )12. A. easy ( )13. A. put ( )14. A. to bring ( )15. A. in the country | B. surprised B. cool B. friend B. me B. drive B. arrived in B. earth B. borrowed B. begin B. 1ucky B. be repair B. possible B. threw B. to take B. in the city | C. happy C. dry C. parents C. mine C. walk C. arrived C. weather C. 1end C. start C. unlucky C. repaired C. necessary C. drop C. bring C. in the mountain | D. tired D. fresh D. neighbours D. my D. drove D. got to D. work D. borrow D. work D. unluckily D. been repaired D. right D. dropped D. take D. in the village |