答案及解析：[单选题]After acceptance and formal transfer of information systems to customers,it has entered the stage of - 软件水平题库- 答案窝(daanwo.com)-大学生作业答案及考资分享平台

问题：

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[单选题] After acceptance and formal transfer of information systems to customers,it has entered the stage of（）.

A.preparation

B.operation anD.maintenance

C.development

D.Extinction

答案解析：

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