汽车由静止开始做匀加速直线运动,经过4s速度达到8m/s,接着做匀速直线运动,再经过10s后改做匀减速直线运动,再经过8s恰好停止.
(1)画出汽车运动的速度-时间图象;
(2)汽车在加速和减速阶段的加速度分别是多大?
(3)汽车一共前进的距离是多少?
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APP具体操作流程为:
下列各项中,影响债券定价的内部因素是()。
A.基础利率
B.银行利率
C.税收待遇
D.市场利率
第三节.完形填空(共20小题;每小题1.5分,满分30分)
阅读下面的短文,掌握其大意,然后从21--40各题所给的四个选项(A、B、C和D)中选出最佳选项。
Greg Mortenson is a mountaineer. In 1993, he 21 but failed to reach K2, one of the most forbidding of the Himalyayan 22 . He staggered(蹒跚) into a tiny village of Korphe in Pakistan, barely alive. The 23 villagers cared for him and fed him back to health. The __24 they showed to a stranger moved Mortenson, and filled him with a' desire to 25 it.
Looking around, he saw that the poor villagers had actually nothing. 26 , he could see the desire of the villagers to 27 their community. For example, they dreamed of 28 for their children. The children received schooling two days a week from a teacher they 29 with another village, because they couldn't 30 to hire one alone. Naturally, the village had no schoolhouse. Moretenson thought it was by building a school 31 he could best express his 32 for their kindness to him. He left, 33 he would return with necessary materials.
However, things didn't go 34 as he had expected. He was a nurse by profession, and wasn't well 35 It was a struggle for him to raise the $10,000 or so needed to buy the building materials. 36 problems, including his then Cultural 37 of the area led to a series of frustrations. But with his efforts and cooperation of the villagers, he eventually overcame the __ 38 . He fulfilled his promise.
After that he wanted to return to America,build a career and start a family. However, it ba-came clear that a school for Korphe was just the start. There were so many other villagers in Pa-kistan that had the similar needs. The more 39 he became, the more he came to understand the area and the more he realized how important education was. The 40 was that, in the pe-riod of over a decade, 55 schools were built.
21. A. approached B. paused C. hesitated D. attempted
22. A. peaks B. levels C. hills D. slopes
23. A. cold B. mean C. kind D. tiny
24. A. bravery B. ability C.poverty D.generosity
25. A. receive B. repay C. respect D. recycle
26. A. Besides B. However C. Therefore D. Moreover
27. A. develop B. visit C. design D. increase
28. A. career B. development C. education D. health
29. A. traded B. worked C. communicated D. shared
30. A. help B. manage C. decide D. afford
31. A. that B. which C. what D. if
32. A. sympathy B. gratitude C. attitude D. anger
33. A. adding B. promising C. demanding D. warning
34. A. smoothly B. badly C. closely D. properly
35. A. dressed B. received C. respected D. paid
36. A. Some B. Others C. Other D. Another
37. A. interaction B. ignorance C. background D. difference
38. A. difficulities B. fears C. temptations(诱惑)D, shortcomings
39. A. interested B. rooted C. involved D. lost
40. A. result B. idea C. cause D. report
在窗体上画一个命令按钮,然后编写如下程序: Private Sub Comrnand3_Click( ) Cop 2 Cop 3 Cop 4 End Sub Sub Cop (a As Integer) Static x As Integer x=x + a Print x; End Sub 程序运行后,单击命令按钮,输出结果为()。
A.内联函数
B.重载函数
C.递归函数
D.嵌套函数
宪法最主要的特征可以归纳为()。
A.在规定的内容上,宪法规定国家制度和社会制度的最基本的原则,公民的基本权利和义务,国家机构的组织及其运作的原则等
B.在法律地位或法律效力上,宪法具有最高法律地位或法律效力
C.宪法是一切国家机关、社会组织和公民个人活动的最高法律依据和行为准则
D.在制定和修改的程序上,宪法的制定和修改都要经过区别与普通法律的特别的程序
对于相关激素间的作用的正确叙述是()
A.协同作用有利于生命活动的调节,拮抗作用不利于生命活动的调节
B.协同作用和拮抗作用都利于生命活动的调节
C.协同作用不利于生命活动的调节,拮抗作用利于生命活动的调节
D.二者都不利于生命活动的调节