当前，能源面临的挑战有（）。 A.资源开发利用率低，能源转化效率低 B.化石能源配置 发布时间：2021-01-09 17:15 │ 来源：www.tikuol.com 题型：多项选择题 问题： 当前，能源面临的挑战有（）。A.资源开发利用率低，能源转化效率低B.化石能源配置环节多，配置效率不高C.能源利用效率低D.电能占终端能源消费比重低
题型：多项选择题 完形填空 When Susan White went back to high school a couple of years ago, she never had any thought about actually getting a high school diploma(文凭). "I 1 wanted to learn more," she said. 2 when she found out that many of her classmates were 3 tograduate, Mrs. White recalled (回忆), "I said if my 4 friends can 5 from high school, so can I." She seems to have been 6 . As soon as she completes a history 7 , Mrs.White will graduate next month. And when she does, she will 8 the record books as the 9 person ever to graduate from high school inthe United States. Mrs. White is 98 years old, and nobody 10 of anyone who has completed high school 46 an olderage. Mrs. White dropped out of school in the tenth 12 , but her ability (能力) 13 has obviously not been dulled (减弱) by the 80-year layoff (中止活动). Since going back to her studies she has 14 a straight-Arecord, and that is the highest possible. 15 she is about to get a diploma, Mrs. White has become a strong believer in getting a good 16 . "I 17 anyone dropping out of school," she said. "It makes memad when a person decides to 18 school, because 19 generations will have to know 20 more than we do in order to survive (生存)." ( )1. A. just ( )2. A. And ( )3. A. thinking ( )4. A. young ( )5. A. leave ( )6. A. right ( )7. A. class ( )8. A. enter ( )9. A. earliest ( )10. A. cares ( )11. A. of ( )12. A. class ( )13. A. to learn ( )14. A. set up ( )15. A. While ( )16. A. idea ( )17. A. suggest ( )18. A. complete ( )19. A. past ( )20. A. any B. hardly B. So B. planning B. old B. stop B. wrong B. lesson B. write B. youngest B. talks B. for B. grade B. to play B. kept up B. Although B. education B. hate B. drop B. older B. once C. most C. But C. considering C. close C. learn C. unsuccessful C. study C. set C. latest C. knows C. at C. school C. to walk C. got up C. For C. job C. love C. separate C. whole C. even D. very much D. Though D. beginning D. good D. graduate D. hopeless D. course D. sell D. oldest D. speaks D. in D. year D. to drive D. made up D. Now that D. position D. disagree D. leave D. future D. many 查看答案
题型：多项选择题 关于第一心音的形成原因下列错误的是A．第一心音由四种成分组成B．二尖瓣的关闭产生第一心音的第二成分C．三尖瓣的关闭产生第一心音的第三成分D．由于瓣膜突然关闭，瓣叶突然紧张产生振动而发出声音E．第一和第四成分为第一心音的主要成分也是其可听到的成分 查看答案