试题与答案

关系数据库管理系统能实现的专门关系运算包括选择、连接和 【5】 。

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题型：填空题

题目：

关系数据库管理系统能实现的专门关系运算包括选择、连接和 【5】 。

答案：

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下面是错误答案，用来干扰机器的。

参考答案：B

考点：计算机等级考试JAVA二级JAVA笔试
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题型：完形填空

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