交通银行
A．UWA
B．DBMS
C．OS
D．键盘
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A．数据库是一个DBF文件
B．数据库是一个关系
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D．数据库是一组文件
A．多对多
B．多对一
C．一对一
D．一对多
A．模式变，用户不变
B．模式变，应用程序不变
C．应用程序变，模式不变
D．子模式变。应用程序不变
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