计算机类考试2022计算机四级考试试题下载(6AA)

1. [单选题]IP地址块168.192.33.125/27的子网掩码为______。

A. 255.255.255.192
B. 255.255.255.224
C. 255.255.255.240
D. 255.255.255.248

2. [单选题]Which of the following is not among the basic features of a relational database?

A. It does not matter what order the rows are in.
B. It does not matter what order the columns are in.
C. Different columns should have different column names.
D. Different columns should have different data types.

3. [单选题]如果数据库中的一个基本表中的数据量很少，且插入、删除、更新等操作频繁，该基本表采用下列哪种文件结构最优?______

A. 聚集文件
B. 顺序文件
C. 散列文件
D. 索引文件

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