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已知集合 http://picflow.koolearn.com/upload/2010-10/18/55f751af-bca5-4a33-aa65-d54fe1361dc7/paper.files/image008.gif下列关系中,不能看作从A到B的映射的是(    )

发布时间:2021-08-04

A.http://picflow.koolearn.com/upload/2010-10/18/55f751af-bca5-4a33-aa65-d54fe1361dc7/paper.files/image009.gif

B.http://picflow.koolearn.com/upload/2010-10/18/55f751af-bca5-4a33-aa65-d54fe1361dc7/paper.files/image010.gif

C.http://picflow.koolearn.com/upload/2010-10/18/55f751af-bca5-4a33-aa65-d54fe1361dc7/paper.files/image011.gif

D.http://picflow.koolearn.com/upload/2010-10/18/55f751af-bca5-4a33-aa65-d54fe1361dc7/paper.files/image012.gif

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