单项选择题

软件测试是软件开发的重要环节，而进行软件测试的目的是

A．证明软件错误不存在
B．证明软件错误的存在
C．改正程序所有的错误
D．发现程序所有的错误
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单项选择题
Chang, Tian and An are three users of the system. Chang and An are in the same group. Tian is a Super User. Which of the following rights is inconsistent with the given policies
Chang, Tian and An are three users of the system. Chang and An are in the same group. Tian is a Super User. Which of the following rights is inconsistent with the given policies
单项选择题
设f：Z×Z→Z，f(＜n，k＞)=n2k，其中Z为整数集合，下面命题为真的是 Ⅰ．f是满射的 Ⅱ．f是单射的 Ⅲ．F-1(N)=ZXN(N 为自然数集合) Ⅳ．f(z{1})=N
A．Ⅰ和Ⅱ
B．Ⅰ和Ⅳ
C．Ⅰ和Ⅲ
D．全为真
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