(61)What is the contrapositive of the relation represented in the exhibit shown

below? ( )。

4

2

1

35

A) R={<1,2>,<1,3>,<1,4>,<1,5>}

B) R={<1,1>,<2,2>,<3,3>,<4,4>,<5,5>}

C) R={<2,1>,<4,1>,<2,2>,<1,3>,<3,2>,<1,4>,<4,4>,<5,4>}

D) R={<1,2>;,<3,1}>,<1,4>,<2,2>,<2,3>,<4,1>,<4,4>,<4,5>}

(62)Which function is NOT served by building a prototype? ( )。

A) It takes the place of the final system.

B) It assists in gathering software requirements.

C) It assists in estimating the cost of the project.

D) It is used as the foundation of the larger projects.

(63)Which of the following statements about testing software with data is (are)

true? ( )。

I. The primary purpose of such testing is to find errors.

II.Such testing can demonstrate the existence of errors but cannot

demonstrate the absence of errors.

A) Neither B) Ⅰ only C) Ⅱ only D) Ⅰ and Ⅱ

(64)Inthefollowing statements about functional dependency, whichone isincorrect?

( )。

A) If X'X, then X→X'.

B) If X→Y and Y'Y, then X→Y'.

C) If X→Y and X'X, then X'→Y.

D) If X→Y and Y→Z, then X→Z.

(65)Which function is used to lock a file in FoxPro DBMS? ( )。

A) FLOCK( ) B) RLOCK( ) C) LOCK( ) D)LOCK

(66)Which is NOT a characteristic of an RISC processor? ( )。

A) a high clock speed

B) a highly optimized pipeline

C) a few general-purpose registers

D) a limited amount of small instructions

(67) Local bus can reduce the occupation time of CPU. For the EISA local bus,

commonly the time can be reduced to( )。

A) 42% B) 22% C) 12% D) 2%

(68)In the modulation style of PSK ,if a kind of Modem's modulation rate is

3200baud and it's phase is 8 , what is the data transfer rate of this kind

of Modem ? ( )。

A) 14.4kbps B) 28.8kbps C) 9600bps D) 3200bps

(69)Which routing select algorithm is described below ? ( )。

According to a kind of fix regulation , the select algorithm of route works

and has nothing to do with the network information newly.( )。

A) Static Routing Algorithm B) Dynamic Routing Algorithm

C) Centralized Routing Algorithm D) Distributed Routing Algorithm

(70)About the following IP addresses ,Which is incorrect ? ( )。

A) 201.199.255.11 B) 201.198.132.1

C) 201.199.128.6 D) 201.198.134.257