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下列函数是偶函数的是(   )

发布时间:2021-07-28

A.http://picflow.koolearn.com/upload/2014-12/16/8205eecd-e52c-4047-b8e8-0685d14db807/paper.files/image018.png

B.http://picflow.koolearn.com/upload/2014-12/16/8205eecd-e52c-4047-b8e8-0685d14db807/paper.files/image019.png

C.http://picflow.koolearn.com/upload/2014-12/16/8205eecd-e52c-4047-b8e8-0685d14db807/paper.files/image020.png

D.http://picflow.koolearn.com/upload/2014-12/16/8205eecd-e52c-4047-b8e8-0685d14db807/paper.files/image021.png

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