题目内容

下列四项中，不属于数据库系统特点的是_______。

A. 数据共享性好
B. 数据的整体结构化
C. 数据冗余度大
D. 数据独立性高

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数据管理技术的发展经历了三个阶段：人工管理阶段，文件系统阶段和________阶段。

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A. came up to
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