题目内容：
在关系模型中，对一个关系的删除操作基本单位是（ ）
A．元组 B．元组分量
C．元组属性
D．属性列
参考答案：
答案解析：
单选题：在关系模型中，对一个关系的删除操作基本单位是（ ）
- 题目分类：公共基础知识
- 题目类型：单选题
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B．元组分量
C．元组属性
D．属性列
B．元组分量
C．元组属性
D．属性列
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