题目内容：
将E—R图转换为关系模式时，实体和联系都可以表示为（ ）。
A．属性 B．键
C．关系
D．域
参考答案：【答案仅供学习，请勿对照自行用药等】
答案解析：
单选题：将E—R图转换为关系模式时，实体和联系都可以表示为（ ）。
- 题目分类：C++
- 题目类型：单选题
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B．键
C．关系
D．域
B．键
C．关系
D．域
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