[单选题]设集合A={a，b，c，d}，B={1,2,3,4}，则从A到B的函数f={< a ,2 >,< b, 1 >,< c, 3 >,< d, 2 >}是（ ）。
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2023-11-01 15:11:15|
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[单选题]设集合A={a，b，c，d}，B={1,2,3,4}，则从A到B的函数f={< a ,2 >,< b, 1 >,< c, 3 >,< d, 2 >}是（ ）。
A.f既不是满射又不是入射函数
B.f是满射函数
C.f是双射
D.f是入射函数
A.f既不是满射又不是入射函数
B.f是满射函数
C.f是双射
D.f是入射函数
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