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
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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
单项选择题
RISC的关键技术是寄存器窗口重叠技术,这项技术很好地支持过程调用和返回操作。这里所谓的重叠是指
A.全局寄存器与高位寄存器重叠
B.全局寄存器与局部寄存器重叠
C.高位寄存器与低位寄存器重叠
D.高位寄存器与局部寄存器重叠
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