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【单选题】
在数据库管理技术发展过程中，经历了人工管理阶段、文件系统管理阶段和数据库系统管理阶段。在这几个阶段中，数据独立性最高的是哪个阶段A.
数据库系统
B.
文件系统
C.
人工管理
D.
数据项管理
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