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【简答题】
John Smith was a writer, who wrote detective stories for magazines, though he never dealt with criminals(罪犯). One evening he could not finish an end for a story. He sat in his study(书房), but he had no ideas. So he decided to go to the cinema. When he came back, he found that he had had a visitor. Someone had broken into his house. The visitor had had a drink, smoked several of his cigarettes and had read his story. The visitor left him a note. “I have read your story and I don’t think it is very good. Please read my suggestions and you can finish it. By the way, I am a thief. I’m not going to steal anything tonight. But if you become a successful writer, I will return.” John read the thief’s suggestions. Then he sat down and wrote the rest of the story. He is still not a successful writer, and he is waiting for his “visitor” to return. Before he goes out in the evening, he always leaves a half-finished story in his study. 56. Detective stories are stories about      . A. science        B. children      C. the future      D. the police 57. John went to the cinema because                    . A. he was too tired B. he wanted to look for a thief C. he could not finish his story and hoped to get some ideas D. he wanted to enjoy himself in the cinema 58. The visitor came to John’s house in order to              . A. steal something  B. read the story  C. have a drink  D. visit the writer 59 The visitor                   . A. stayed in John’s house for a night    B. took some of John’s things away C. left John some advice D. was a good friend of John’s 60. John would like to                    . A. have a talk with his visitor B. get more ideas from the visitor C. make friends with the visitor D. catch the visitor and take him to the police DCAC
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【简答题】在关系模式R(A,B,C,D)中,存在函数依赖关系{A→B,A→C,A→D,(B,C)→A},则候选码为( )。 A)A B)(B,C) C)A和(B,C) D)A或(B,C)
【单选题】在关系模式R(A, B, C, D) 中,存在函数依赖关系{A→B, A→C, A→D,(B,C) →A},则候选码为( )。
A.
A
B.
(B,C)
C.
A和(B,C)
D.
A或(B,C)
【单选题】*关系模式R(A,B,C,D)中,存在函数依赖关系{A→B,A→C,A→D,(B,C)→A},则关系模式R最高达到( )。
A.
1NF
B.
2NF
C.
3NF
D.
BCNF
【单选题】塑料的密度大约为( )。
A.
0.8~2.0g/Cm3
B.
8~20g/Cm3
C.
比水大
D.
比水小
【单选题】塑料的密度大约为( )。
A.
0.8 ~ 2.0g/ cm3
B.
8 ~ 20 g/cm3
C.
比水大
D.
比水小
【单选题】关系模式R(A,B,C,D)中,存在函数依赖关系{A→B,A→C,A→D,(B,C)→A},则关系模式R最高达到( )。
A.
1NF
B.
2NF
C.
3VF
D.
BCNF
【单选题】下列关于visual studio 2008的叙述中,哪个是不正确的?
A.
可以支持高校团队协作
B.
能够轻松构建以客户为中心的web应用程序
C.
能够在同一开发环境内创建面向多个.NETframewofk版本的应用程序
D.
拼写检查器中的拼写规则用XML语言定义,用户无法修改
【简答题】在关系模式R(A,B,C,D)中,存在函数依赖关系{A→B,A→C,A→D,(B,C)→A},则候选码是____,关系模式R(A,B,C,D)属于____。
【判断题】通常,可以使用物质资源的次序为(1)先使用系统内部资源后是系统外部资源;(2)先使用直接资源后是派生资源;(3)先使用静态资源后动态资源。
A.
正确
B.
错误
【单选题】塑料的密度大约为( )。
A.
、0.8〜2.0g/cm3
B.
8〜20g/cm3 C、比水大
C.
比水小
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