问题 计算题

电动自行车的技术参数如下:

(1)若行驶时人车共重1400N,每个车轮接触地面 面积0.5dm2,整车对地面的压强是多大?

(2)电动车在平直公路上行驶受平均阻力60N,在额定功率下,电动车匀速行驶的速度是多少km/h?

(3)为保证交通安全,很多城市规定电动车的最高时速为20km/h,以这个速度行驶从学校到火车站要用30min。电动机对车做了多少功?

答案

解:

(1)

(2)

(3)

完形填空

第二部分:完形填空(共两节,满分30分,每小题1.5分)

The most   21   thing during my long summer holiday last year, of course is my trip __22__England. This was my first time to go abroad, so it really made me   23 .

At first,I went to Shakespeare's   24  . It was the house   25  Shakespeare was born and   26  his early years.   27  sitting room, hallway, bedrooms, and kitchen were furnished (布置) in sixteenth-century    28  . I also went to see the Shakespeare Exhibition. It showed Shakespeare's life and career in both Stratford and London.

I really enjoyed this nice trip to England,   29    I learnt a lot. I'm very happy that I could visit such an interesting   30   . I want to go there again in the future.

21. A. unforgettable     B. unexpected       C. fashionable       D. famous

22. A. at                  B. for              C. on                D. to

23. A. excited             B. disappointed    C. exciting             D. disappointing

24. A. school            B. birthplace       C. room               D. home

25. A. who               B. that              C. when             D. where

26.A. paid                 B. spent             C. cost              D. took

27.A. It's                  B. Its                C. It had                      D. It was

28. A. style               B. site               C. shape                     D. shade

29. A. for which           B. which              C. from which        D. in which

30. A. place              B. town              C. country            D. summer

单项选择题