南车株研所笔试题目及答案

1、2012春季招聘南车株洲所机械类笔试题目1. 装配方法：完全互换法装配；分组装配；修配法；调整法。2. 硬度测试法：塑料洛氏硬度测试，邵氏硬度测试，金属洛氏硬度，金属布式硬度，金属 维氏硬度，显微维氏硬度。3. 构件承载能力的衡量指标：强度，刚度，稳定性4. 滚动轴承内外的配合：外圈过盈配合，基轴制；内圈是过盈配合，基孔制。5. 带轮的张紧方法：定期张紧，自动张紧，采用张紧轮。6. 锻造时最高温度叫始锻温度停止锻造温度分别叫什么叫终锻温度7. 轴采用何种热处理方法：调质处理（淬火加高温回火，既有较高的强度极限和屈服极限， 又有较高的韧性，具有较好的综合性能）8. 几何形状误差的种类：形状误差分

2、为，直线度，圆度，平面度，圆柱度，线轮廓度，面 轮廓度；几何误差：平行度，垂直度，位置度9. 丰田式生产管理的核心：精益生产：核心思想是把传统的推动生产转为拉动生产，从而建立起具有高度灵活性、高效率的生产系统。10. 塞规测量的原理如果通规能够通过，则孔的尺寸大于最小极限尺寸，若止规不能通过，则孔的尺寸小于最大极限尺寸。卡规的测量的原理：若通规能够通过，则轴径小于最大 极限尺寸，若止规不能通过，则轴径大于最小极限尺寸。11. 回火的概念 回火是将工件重新加热到AC1以下某一温度，保温一段时间，然后取出以一定方式冷却下来目的：消除内应力获得较好的力学性能。按照基准统一原则选用精基准的优点？能用于

3、多个表面的加工及多个工序的加工，可以减少因基准变换带来的误差，提高加工精度。此外，还可以减少夹具的类型，减少设计夹具的工作量。制9图中如何选用设计基准？首选大的基准面，重要的尺寸为设计基准常见的铸造缺陷：气孔，粘砂，夹砂，冷隔和浇不足。12. Homework has never been terribly popular with students and even many parents, but in recent years it has been particularly scorned. School districts across the country, most rece

4、ntly Los Angeles Unified, are revising their thinking on his educational ritual. Unfortun ately, L.A. Uni fied has produced an in flexible policy which man dates that with the exceptio n of some adva need courses, homework may no Ion ger count for more tha n 10% ofa student s academic grade.13. This

5、 rule is meant to address the difficulty that students from impoverished or chaotic homes might have in completing their homework. But the policy is unclear and contradictory. Certainly, no homework should be assigned that students cannot do without expensive equipment. But if the district is essent

6、ially giving a pass to students who do not do their homework because of complicated family lives, it is going riskily close to the implication that sta ndards n eed to be lowered for poor childre n.14. District administrators say that homework will still be a pat of schooling: teachers are allowed t

7、o assig n as much of it as they want. But with homework counting for no more tha n 10% of their grades, students can easily skip half their homework and see vey little differenee on their report cards. Some students might do well on state tests without completi ng their homework, but what about the

8、stude nts who performed well on the tests and did their homework? It is quite possible that the homework helped. Yet rather than empowering teachers to find what works best for their students, the policy imposes a flat, across-the-board rule.15. At the same time, the policy addresses none of the tru

9、ly thorny questions about homework.If the district finds homework to be unimportant to its students academic achievement, itshould move to reduce or eliminate the assignments, not make them count for almost nothing. Conversely, if homework does nothing to ensure that the homework students are not as

10、signing more than they are willing to review and correct.16. The homework rules should be put on hold while the school board, which is responsible for setting educational policy, looks into the matter and conducts public hearings. It is not too late for L.A. Unified to do homework right.17. 21.It is

11、 implied in paragraph 1 that nowadays homework.18. A is receiving more criticism19. B,is no longer an educational ritual20. Cis not required for advanced courses21. Dis gaining more preferences22. 22.L.A.Unified has made the rule about homework mainly because poor students.23. Atend to have moderate

12、 expectations for their education24. B,have asked for a different educational standard25. Cmay have problems finishing their homework26. Dhave voiced their complaints about homework27.28. 23.According to Paragraph 3,one problem with the policy is that it may.29.30. Adiscourage students from doing ho

13、mework31.32. B,result in students indifference to their report cards33.34. Cundermine the authority of state tests35.36. Drestrict teachers power in education37.homework is38. 24. As mentioned in Paragraph 4, a key question unanswered about whether. A it should be eliminated39.40. B,it counts much i

14、n schooling41.42. Cit places extra burdens on teachers43.44. Dit is important for grades45.46. 25.A suitable title for this text could be.47.48. AWrong Interpretation of an Educational Policy49.50. B,A Welcomed Policy for Poor Students51.52. CThorny Questions about Homework53.54. DA Faulty Approach to