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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?
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