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下列函数中,以为最小正周期的偶函数,且在上为减函数的是 ( ) A. B. C....

下列函数中,以6ec8aac122bd4f6e为最小正周期的偶函数,且在6ec8aac122bd4f6e上为减函数的是                (    )

       A.6ec8aac122bd4f6e                          B.6ec8aac122bd4f6e

       C.6ec8aac122bd4f6e                                        D.6ec8aac122bd4f6e

 

B 【解析】
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