题目

已知an+1=an+3，则数列{an}是 A.递增数列                                                     B.递减数列C.常数列                                                        D.摆动数列 答案：解析:由an+1=an+3，即an+1－an=3＞0知，数列{an}为递增数列.答案:A

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