开关电源的频率越高，其开关管的损耗就（），开关电源的体积就（）。 发布时间：2020-01-17 13:57 │ 来源：www.tikuol.com 题型：填空题 问题： 开关电源的频率越高，其开关管的损耗就（），开关电源的体积就（）。
题型：填空题 完形填空。 Ted Thomason was considered one of the students who showed the least interest in school. Whenever Miss Daisy talked with him, he would answer with a 1 "yes" or "no". He was always in dirty clothes. Hishair was 2 combed (梳). No one liked him. Miss Daisy had to admit that she felt sort of improper 3 when she graded his paper with an "F" (Fail). It was Christmas. Presents from the boys and girls were piled up on her desk. Miss Daisy was 4 to find one of them was from Ted. It was an ugly 5 with half of the stones missing. The students raised a great noise at Ted's present, but Miss Daisy realized she must put it on and 6 the class. She even asked whether it looked pretty 7 her. Class was over, and 8 all went home, Ted went up to the desk and, ina(n) 9 voice, he said, "Miss Daisy, Miss Daisy … I am so glad you 10 my present. You smile like my mother and her necklace is really beautiful on you." After Ted 11 , Miss Daisy fell on her knees, begging God to forgive her: Ted's mother 12 just a year ago and she was treating him in a way she shouldn't be! The next day, the children found a completely new teacher. Miss Daisy 13 into a different person. She did all she could to help each child in her class, 14 those with poor lessons and among them was Ted. At the end of the year, Ted made great 15 . He caught up with most of the class, and 16 got ahead of someof them. Several years later, Ted graduated with honors from high school; another four years, Ted left his 17 as a best graduate. Again four years later, Miss Daisy received a letter, 18 her to Dr. Ted Thomason's wedding. Of course, she 19 the party. And she was set in the seat intended for Ted's 20 -her love and whatshe did were unforgettable for Ted all his life. ( )1. A. cold ( )2. A. often ( )3. A. dislike ( )4. A. surprised ( )5. A. chain ( )6. A. frighten ( )7. A. around ( )8. A. since ( )9. A. friendly ( )10. A. receive ( )11. A. cried ( )12. A. visited ( )13. A. changed ( )14. A. exactly ( )15. A. interest ( )16. A. ever ( )17. A. college ( )18. A. reminding ( )19. A. answered ( )20. A. teacher B. happy B. sometimes B. pride B. happy B. necklace B. comfort B. on B. until B. eager B. praise B. talked B. died B. grew B. completely B. presents B. even B. school B. requiring B. attended B. friend C. silent C. never C. disappointment C. interested C. watch C. calm C. over C. before C. excited C. recognize C. left C. disappeared C. got C. namely C. progress C. still C. class C. telling C. accepted C. mother D. direct D. always D. pleasure D. puzzled D. dress D. punish D. with D. after D. worried D. like D. finished D. suffered D. went D. especially D. necklaces D. yet D. course D. inviting D. organized D. lover 查看答案
题型：填空题 红宝石激光器发射的激光是不连续的一道一道的闪光，每一道闪光称为一个光脉冲，现有一红宝石激光器，发射功率为P，所发射的每个光脉冲持续的时间为Δt，波长为λ，则每个光脉冲中含有的光子数是（ ）A．B．C．D． 查看答案
