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

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

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