6. （ ） is a subclass of software. It consists of a collection of programs that control the operations of a computer and its devices. It servers as the interface between the user and the computer hardware. A. System software B. Applicat...

19. The common input devices are the （ ）and the keyboard. A. printer B. speaker C. monitor D. mouse ...

12. （ ）(Reduced Instruction Set Computer) refers to processors that support fewer instructions than CISC chips. The reduced number of instructions enables them to execute instructions faster. A. CISC B. RISC C. RAM D. ROM ...

6. The first computers used （ ） for circuitry and magnetic drums for memory, and were often enormous, taking up entire rooms. A. vacuum tubes B. transistors C. integrated circuits D. microprocessors ...

1. A （ ）is a communication device that enables computers to communicate via telephone lines or cable. A. modem B. hardware C. software D. processor ...

6. 要删除视图myviewview，可以使用（ ）语句。 A. DROP database myviewview B. DROP TABLE myviewview C. DROP INDEX myviewview D. DROP VIEW myviewview ...

1. SQL Server 2008 采用的身份验证模式是（ ）。 A. 仅Windows身份验证模式 B. 仅SQL Server身份验证模式 C. 仅混合模式 D. Windows身份验证模式和混合模式 ...

6. 在SELECT语句中，用于显示部分查询结果的TOP短语与（ ）同时使用，可以显示出查询的排序效果。 A. ORDER BY B. CREATE C. DROP D. USEFOR ...

6. 聚合函数中COUNT函数主要统计不包含NULL的字段的平均值。（ ） A. 错误 B. 正确 ...

1. 聚合函数中AVG函数功能是求最小值。（ ） A. 错误 B. 正确 ...