问题 问答题 简答题

为什么对一些钢结构件焊后要进行消应力处理?

答案

参考答案:

有些钢结构件焊后,由于其钢性较好而无明显的焊接变形,但焊接应力是相当大的,在钢结构使用的一段时间后,可能由于某种原因释放出来而引起变形,以致于破坏。

因此,对某些重要用途的钢结构,如高压容器,危险介质的容器,锅炉等,焊后采用各种方法进行消应力处理,目的就是防止钢结构件中的内应力对构件产生危害。

完形填空

完形填空  (共10小题;每小题1.5分,满分15分)  

阅读下面短文,从短文后所给各题的A、B、C、D四个选项中选出能填入相应空白处的最佳选项。

The study of the effects of music on the mind and brain has been a subject of interest for many. The   16  has concluded that music does have positive effects on the mind and brain.

Music is found to affect the   17   of learning and thinking. If work is   18   by quiet and comforting music, it helps the listener think, analyze and work faster in a more   19  manner. Music   20   a positive attitude in the listeners and provides them with motivation(动力;动机). Surveys have shown that music brings about remarkable improvements in the   21  skills of students. Listening to pleasant music, while doing a difficult task, can make   22  seem easier.

Music has a   23   effect on the interpersonal skills of an individual.  24  that we face in life are often the result of lack of confidence and lack of desire to learn. Students’ poor academic results are often a(n)   25  of their lack of motivation and their disinterest. Music lessons during school can help the students   26  their mental block. Music proves helpful in encouraging young children to venture new fields.

Music   27   plays a vital role in strengthening   28  . Certain tunes are known to activate all the parts of the listener’s body, thus   29  him/her in the performance of other creative tasks. Music is found to give students the capacity to trust   30  . Music stimulates the brain centers that deal with thinking, analyzing and planning, thus strengthening one’s organizational skills.

16. A. newspaper   B. book   C. research     D. time

17. A. joy         B. process       C. beginning   D. task

18. A. accompanied        B. created       C. done   D. composed

19. A. inefficient(低效的)         B. efficient      C. interesting          D. boring

20. A. reduces         B. combines    C. takes   D. develops

21. A. academic      B. physical       C. original        D. historic

22. A. music    B. learning      C. lessons        D. it

23. A. positive         B. negative     C. passive        D. harmful

24. A. Diseases       B. Successes   C. Failures       D. Difficulties

25. A. income          B. outcome     C. improvement      D. progress

26. A. live        B. love     C. hate    D. fight

27. A. never    B. still      C. ever    D. also

28. A. responsibility          B. creativity    C. duty    D. intelligence

29. A. benefiting     B. constructing       C. damaging   D. worrying

30. A. others B. teachers     C. themselves         D. texts

多项选择题