（）is not a linear structure

单项选择题（） is permanently stored in the computer and provides a link between the hardware and other programs that run on the PC.

A．Interface　
B．Operating system
C．Internet
D．Application software

单项选择题A （）copies a photograph, drawing or page of text into the computer.

A．scanner
B．printer　
C．display
D．keyboard

单项选择题The（）controls the cursor or pointer on the screen and allows the user to access commands by pointing and clicking.

A．graphics
B．printer
C．program
D．mouse

单项选择题A （）computer is a personal computer whose hardware is capable of using any or all of the following media in a program: audio, text, graphics, video and animation.

A．database
B．multimedia
C．network　
D．mainframes

单项选择题在局域网模型中，数据链路层分为（）。

A．逻辑链路控制子层和网络子层
B．逻辑链路控制子层和媒体访问控制子层
C．网络接口访问控制子层和媒体访问控制子层
D．逻辑链路控制子层网络接口访问控制子层