2007年11月程序員模擬試題（3）上午試卷

　　●Let R and S be the relation respection respectively：

　　Relation R:A B C Relation S:B C D

　　1 2 3 2 3 4

　　6 7 8 2 3 5

　　9 7 8 7 8 1

　　The number of tuples that the result of the expression R∞S(Here if natural join of relations R and S) is (69) .

　　(69) A.1

　　B.4

　　C.7

　　D.10

　　●In C program，all variables must be (70) before use，usually at the beginning of the function before any (71) statements.

　　(70) A.stated

　　B.writed

　　C.illustrated

　　D.declared

　　(71) A.operate

　　B.active

　　C.executable

　　D.processing

　　●Which of the following statements about object oriented database is not correct? (72) .

　　(72) A.Each object has a unique object identify in the system

　　B.Encapsulation and inheritance are two important features of object oriented database

　　C.A subclass can inherit the attributes and methods of all its superclasses

　　D.A supereloss includes the attributes and methods at all subclasses

　　●A disk scheduling mechanism in an operating system causes the disk arm to sweepbackand forth across the disk Surface servicing all requests in its path.This is a (73) .

　　(73) A.First Come First Serve

　　B.Shortest Seek Time First

　　C.Scan

　　D.None of the above

　　● (74) functions with two layers of protocols.It can connect networks of different speeds and can be adapted to an environment as it expands.

　　(74) A.The hub

　　B.The bridge

　　C.The router

　　D.The proxy

　　●When a string constant is written in C program，the compiler creates (75) of characters containing the characters of the string，and terminating it with"\0".

　　(75) A.a group

　　B.an array

　　C.a stack

　　D.a series

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