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下列有关数据库的描述,正确的是(  )。

A、数据库设计是指设计数据库管理系统

B、数据库技术的根本目标是要解决数据共享的问题

C、数据库是一个独立的系统,不需要操作系统的支持

D、数据库系统中,数据的物理结构必须与逻辑结构一致

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