单选

下面(70)不是对象-关系数据库的基本特征。

A．关系的规范化程度更高
B．SQL环境中对基本数据类型的扩充提供了支持
C．对规则系统的支持
D．SQL环境中对继承性提供了支持

试题出自试卷《软件水平考试（初级）程序员上午（基础知识）模拟试卷35》

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