(16)用于批处理系统中，它是指在内存中同时存放若干个作业，并使这些作业交替运行，以提高系统资源的利用率。(17)是由多个分散的计算机经互联网络而组成的一个系统，这些计算机之间可以通过通信来交换信息，互相无主次之分，它们共享系统资源，相互协作共同完成任务。

Viruses usually have two phases to their execution, the infection phase and the(75)phase. The later phase is optional, since stone viruses simply reproduce.

(74)isn't a type of transmission medium used for LANs.

A(73)is used to communicate with another computer over telephone lines.

Multimedia is the combination of computer and(72)technology.

In the RGB color spaces, each pixel on the screen has a corresponding RGB value which consists of()components.

In C language,(70)is a collection of one or more variables, possibly of different types, grouped together under a single name for convenient handling.

A stack protocol can be used for(69).

A(68)program is usually described as a program written in high-level language.

(70)

(69)