• 2022-05-31
    设[img=249x25]1802f91f9ada87a.png[/img]是A到B的二元关系,且[img=620x25]1802f91fa705b01.png[/img]则( )不是从A到B的函数.
    A: [img=20x22]1802f91faf7a023.png[/img]
    B: [img=20x22]1802f91fb78afef.png[/img]和[img=20x22]1802f91faf7a023.png[/img]
    C: [img=20x22]1802f91fc8a4b43.png[/img]
    D: [img=20x22]1802f91fb78afef.png[/img]和[img=20x22]1802f91fc8a4b43.png[/img]