[单选题]设Z、N、E、分别为整数集，自然数集，偶数集，则下列函数是双射的为（）。
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2023-11-01 15:11:13|
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[单选题]设Z、N、E、分别为整数集，自然数集，偶数集，则下列函数是双射的为（）。
A.f：Z→Z，f（x）=8
B.f：Z→E，f（x）=8x
C.f：N→NⅩN，f（n）=<n，n+1>
D.f：Z→E，f（x）=2x
A.f：Z→Z，f（x）=8
B.f：Z→E，f（x）=8x
C.f：N→NⅩN，f（n）=<n，n+1>
D.f：Z→E，f（x）=2x
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