题目内容

计算机硬件系统由(4)五大部分组成，其中存储器是硬件系统中的记忆设备，(5)。

A. 运算器、控制器、存储器、输入设备、输出设备
B. 微处理器、存储器、I/O端口、定时器／计数器、中断
C. 算术/逻辑运算单元、累加器、寄存器组、时序产生器、数据总线
D. 程序计数器、指令寄存器、指令译码器、时序产生器、状态/条件寄存器

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Document(url,(68), text, type, length, modify)
Where all the(69)are character strings. In this framework, anindividual document is identified with a(70)in this relation. Of course, if some optional information is missing from the HTML document, the associate fields will de left blank, but this is not uncommon in any database.

A. schema
B. relation
C. platform
D. module

A．＜X,101,F＞＜X，I12＞B．＜X,I01,F＞＜X，I10＞C．＜X,I01＞＜X，I12＞D．＜X,I01,P＞＜X，I12，F＞

A. ＜X,101,F＞＜X，I12＞
B. ＜X,I01,F＞＜X，I10＞
C. ＜X,I01＞＜X，I12＞
D. ＜X,I01,P＞＜X，I12，F＞

【C19】

A. in
B. before
C. in font of
D. in the front of

A．fieldB．relationC．scriptD．tuple

A. field
B. relation
C. script
D. tuple