[单选题]设A={a, b}，B={1, 2}，R1，R2，R3是A到B的二元关系，且R1={<a，2>, <b，2>}，R2={<a，1>, <a，2>, <b，1>}，R3={<a，1>, <b，2>}，则（ ）不是从A到B的函数。
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2023-11-01 15:11:11|
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[单选题]设A={a, b}，B={1, 2}，R1，R2，R3是A到B的二元关系，且R1={<a，2>, <b，2>}，R2={<a，1>, <a，2>, <b，1>}，R3={<a，1>, <b，2>}，则（ ）不是从A到B的函数。
A.R1和R3
B.R3
C.R1和R2
D.R2
A.R1和R3
B.R3
C.R1和R2
D.R2
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