题目内容

Created in the fall of 2007, the group is a _______ political experiment.

A. breakthrough
B. breathtaking
C. pathbreaking
D. pathfinding

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The company has been in _______ with its previous auditors for a full year.

A. accordance
B. line
C. alliance
D. litigation

数据通信系统的工作方式有几种？各有何特点？

关系模式中2NF是指()

A. 满足1NF且不存在非主属性对码的传递依赖现象
B. 满足INF且不存在非主属性对码的部分依赖现象
C. 满足1NF且不存在非主属性
D. 满足1NF且不存在组合属性

关系模式中3NF是指()。

A. 满足2NF且不存在非主属性对码的传递依赖现象
B. 满足2NF且不存在非主属性对码部分依赖现象
C. 满足2NF且不存在非主属性
D. 满足2NF且不存在组合属性