西南科技大学网络学院 程序设计语言VB试卷(2)

又因

-1-1

|A|≠0 （∵A可逆，由定义知A可逆）

*

∴|A|≠0

*

所以A是可逆的． （6分） 因为

可知

（8分）

（10分）

22. 求向量组?1,?2,?3,?4的秩。其中，?1?(1,0,?1)，?2?(?2,3,1)，?3?(2,1,?1)，

?4?(3,2,?4)。

解：把

排成

的矩阵A（2分）

这是一个\下三角形\矩阵

（12分）

（8分）

28. 当a、b为何值时，线性方程组

?x1?x2?x3?x4?x5?a?3x?2x?x?x?3x?0?12345 ?x?2x?2x?6x?b2345???5x1?4x2?3x3?3x4?x5?2有解，当其有解时，求出其全部解。 解：

（3分）

时

方程组有解（无穷多解）。（7分）

得一般解： 补齐

（10分）

用解向量形式表出为：

?2?20???35. 试求一个正交的相似变换矩阵, 将对称阵??21?2?化为对角阵。

?0?20???解:将所给矩阵记为A? 由

2??A??E??20 对于?1??2? 解方程(A?2E)x?0? 即

?21???20?2?(1??)(??4)(??2)? ??得矩阵A的特征值为?1??2? ?2?1? ?3?4? （3分）

?4?20??x1??0????????23?2???x2???0?? ?0?22??x??0????3???得特征向量(1? 2? 2)? 单位化得p1?(, 对于?2?1, 解方程(A?E)x?0? 即

T

1322T, )? （6分） 330??x1??0??1?2???????20?2???x2???0?? ?0?2?1??x??0????3???

得特征向量(2? 1? ?2)? 单位化得p2?(, , ? 对于?3?4, 解方程(A?4E)x?0? 即

T

23132T)? （9分） 3??2?20??x1??0????????2?3?2???x2???0?? ?0?2?4??x??0????3???得特征向量(2? ?2? 1)? 单位化得p3?(, ?1

T

2321T, )? （12分） 33 于是有正交阵P?(p1? p2? p3)? 使P?AP?diag(?2? 1? 4)? （15分）

英语B1

单选题

2. The reason we’re so late is C

4. The two elements _______ water is made are oxygen and hydrogen. C 7. ________ he works hard, I don’t mind when he finishes the experiment. D

16. _____ the old man’s sons wanted to know was _____ the gold had been hidden. B 17. Is this museum _______ you visited a few days ago? D 23. How beautifully she sings! I have never heard ________. D

29. The sales manager asked his men to inform him ____ everything concerning the sales in B 32. All examination paper ________, the teacher let the students leave. D

34. ________ fashion varies from country to country may reflect the cultural differences A 37. Copper as well as most metals ________. A

40. It makes no difference to me ________ he will come or not. D

45. We didn’t know his telephone number, otherwise we ________ him A 52. We don’t doubt ________ he can make a good job of it. B 54. ----- Who is John Smith? C

69. The rest of the magazines ________ on sale today. C

80. Vitamins are a group of substances found in food. The body needs them for life and health. 80. 1-5 BCDDA 6-10 BABDB 11-15 CBCCB 16-20 CCBDB

81. Holidays in the United States usually occur at least once a month. Most months have a 81. 1-5 CDDAD

85. The whole body is covered with skin. The surface of the skin is dead (like the hair 85. 1-5 CACBD

24. Directions: For this part, you are required to write a composition on the topic: Equal Education. You should write at least 120 words following the outline given below: 1. Children in the cities have better education.

2. Children in the countryside have no such chances. 3. My suggestions

since the reform and the opening up ,great changes have taken place in china ,so is the education ,unfortunately ,the development is uneven ,especially between rural and urban areas.as we know ,education affect the future of a country ,it is so important that none of us can afford to ignore it,generally speaking ,as a result of the economic situations,the city is more advanced in everyway compared with the

country side,far more fund and resources are poured into city ,while the rural erea was laged far behind.it is common to see that children in the city sit in the comfortable classroom with brandnew desk and chairs listening to the best teacher in almost every field ,while the students in the country side even did not have enough money to buy a pencil,and there is only three or four teachers in a so called school.i remember that premier Wen said develpment must be for the people ,by the people ,and the achievement must be shared by all the people ,i don't think it's right to see the gap in education expanding again and again ,there must something can be done to make sure the students in the countryside can enjoy equal ,high quality ,and affordable aducation as there counterparts in the city.

毛泽东思想概论

单选题

2. 毛泽东思想初步形成于（C）

A、中国共产党创建时期 B、国民革命时期 C、土地革命战争前中期 D、抗日战争时期

6. 旧民主主义革命向新民主主义革命转变的标志是（C）

A、辛亥革命 B、新文化运动 C、五四运动

D、中共“一大”

8. 新旧民主主义革命的根本区别是（B）

A、革命的对象不同 B、革命的领导阶级不同 C、革命的前途不同

D、革命的动力不同

9. 打响武装反抗国民党反动派第一枪的起义是（A）

A、南昌起义 B、秋收起义 C、广州起义 D、百色起义

16. 抗战初期，中共党内出现的错误倾向是（B）

A、王明“左”倾冒险主义 B、王明新投降主义 C、陈独秀右倾机会主义 D、张国焘右倾分裂主义

20. 共产党领导的多党合作与政治协商制度的基本组织形式是（B）

A、人民代表大会 B、中国人民政治协商会议

C、最高国务院会议 D、共产党与民主党派联席会议

22. 1950年6月，中央人民政府颁布的土地法是（B）

A、《中国土地法大纲》 B、《中华人民共和国土地法》

C、《中国土地改革法》

D、《中华人民共和国土地改革法》

24. 过渡时期总路线的主体是（A）

A、实现社会主义工业化 B、实现对农业的社会主义改造

C、实现对手工业的社会主义改造 D、实现对资本主义工商业的社会主义改造29. 1942年延安整风运动的方针是（B）

A、坦白从宽，抗拒从严 B、惩前毖后，治病救人 C、批评与自我批评 D、挽救失足者

34. 完整准确地理解毛泽东思想的科学体系，就是要把握毛泽东思想的（D …… 此处隐藏：4017字，全部文档内容请下载后查看。喜欢就下载吧 ……