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已知函数 http://picflow.koolearn.com/upload/papers/20140824/20140824042552879779.png.下列命题:(  ) ①函数 http://picflow.koolearn.com/upload/papers/20140824/20140824042552895447.png的图象关于原点对称; ②函数 http://picflow.koolearn.com/upload/papers/20140824/20140824042552895447.png是周期函数; ③当 http://picflow.koolearn.com/upload/papers/20140824/20140824042552926499.png时,函数 http://picflow.koolearn.com/upload/papers/20140824/20140824042552895447.png取最大值;④函数 http://picflow.koolearn.com/upload/papers/20140824/20140824042552895447.png的图象与函数 http://picflow.koolearn.com/upload/papers/20140824/20140824042552973462.png的图象没有公共点,其中正确命题的序号是

发布时间:2021-07-16

A.①③

B.②③

C.①④

D.②④

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