电液伺服阀的动态性能一般用______响应和______响应来反映。

题型:填空题

问题:

电液伺服阀的动态性能一般用______响应和______响应来反映。

考点:同等学力2009年同等学力申硕机械工程真题
题型:填空题
设S是至少含有两个元素的集合.在S上定义了一个二元运算“*”(即对任意的a,b∈S,对于有序元素对(a,b),在S中有唯一确定的元素a*b与之对应).若对于任意的a,b∈S,有a*( b*a)=b,则对任意的a,b∈S,下列等式中不能成立的是(  )
A.b*( b*b)=bB.[a*( b*a)]*( a*b)=a
C.( a*b)*a=aD.( a*b)*[b*( a*b)]=b
题型:填空题

下列何项不是温脾汤的组成()。

A.细辛

B.大黄

C.附子

D.人参

E.白术

题型:填空题

国人施行硬膜外间隙穿刺时穿破硬膜的发生率约()。

A.O.01%~0.1%

B.0.27%~0.5%

C.1%~1.5%

D.2%~3%

E.3%~10%

题型:填空题

On a hot summer day in late August, I sought shade and a cool drink at a waterfront cafe on a Greek island. Over hundred degrees in   21  air. Crowded. Tempers(脾气)of both the tourists and waiters had   22  to meet the situation, making it a rather quarrelsome environment(环境).

At the table next to mine sat an attractive,   23  couple, waiting for   24 . They held hands, whispered, kissed, and laughed. Suddenly they stood, picked up their   25  and stepped together   26  the edge of where they were sitting to place the table in the sea water. The man stepped   27  for the two chairs. He politely   28  his lady in the knee-deep water and then sat down himself. All people around laughed and cheered.

  29  appeared. He paused for just a second, walked into the water to   30  the table and take their   31 , and then walked back to the   32  cheers of the rest of his   33 . Minutes later he returned carrying a bottle of wine and two glasses. Without pausing, he went

  34  into the water to   35  the wine. The couple toasted(祝酒)each other, the waiter and the crowd. And the crowd   36  by cheering and throwing flowers to them. Three other tables   37   to have lunch in the water. The place was now filled with laughter.

One doesn’t step into water in one’s best summer clothes. Why not?

Customers are not served   38 . Why not?

Sometimes one should consider   39  the line of convention(常规)and enjoy   40  to the fullest.

21. A. fresh                  B. cool                      C. still                  D. thin 

22. A. managed            B. expected            C. attempted         D. risen 

23. A. lonely                B. curious         C. well-dressed      D. bad-tempered   

24. A. cheers                B. service                     C. attention           D. flowers

25. A. metal table         B. empty bottle  C. chairs              D. bags

26. A. on                     B. off                   C. around             D. along

27. A. outside               B. forward        C. down                      D. back  

28. A. led                    B. seated               C. watched            D. received

29. A. The manager      B. A friend          C. A waiter           D. The servant 

30. A. set                     B. wash                C. remove             D. check

31. A. menu                 B. bill                  C. food                 D. order

32. A. loud                  B. anxious             C. familiar            D. final

33. A. tourists              B. customers         C. fellows             D. assistants

34. A. at last                B. in time           C. once more               D. as well

35. A. change                      B. drink              C. sell                  D. serve 

36. A. replied             B. insisted           C. agreed            D. understood 

37. A. prepared            B. joined in           C. settled up          D. continued 

38. A. with pleasure       B. in the café               C. in the sea          D. with wine

39. A. following           B. keeping            C. limiting            D. crossing 

40. A. life                    B. wine                C. lunch                      D. time 

题型:填空题

人口老龄化虽然不可避免地带来劳动力的短缺,但劳动供给短缺将激励改进要素利用的技术创新,从而加速技术进步。在知识经济不断发展的今天,物质资本投资的折旧率高,投资回报呈不断下降的趋势,相反,人力资本投资的报酬率却能持续维持在高水平。人口老龄化将诱发由重视物质资本投资向重视人力资本投资的转变,从而潜在地促进生产率提高,并且健康老年人口的经验、技能等人力资本,也可以扩大人力资源的供给,从而使经济中的生产力提高。
这段文字意在说明( )。

A.人口老龄化并不必然损害经济增长
B.劳动供给短缺有助于加速技术进步
C.知识经济时代人力资本投资的报酬率高
D.人口老龄化将诱发重视人力资本投资

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