计算机中指令由(15)解释。设某条指令中的操作数部分为x，地址x的主存单元内容为 Y，地址Y的主存单元内容为z。如果用直接寻址方式，参与操作的数据为(16)；如果用间接寻址方式，参与操作的数据为(17)。

(74)

The main feature of(72)is that they follow a first-come/first-served rule. For instance, the line of(73)waiting to be run on a computer system.

Whenever new information is entered, it must be stored somewhere in the computer's(70). RAM only(71)the data temporarily. That is, all information stored in the RAM will disappear if you switch the computer off.

(72)

(70)

A(68)is used to show you what the computer is doing. It is called(69)equipment as well as the keyboard, the mouse and the printer.

(68)

One solution to major security problems is(75), which are frequently installed to fix known security holes.

(66)is defined as the buying and selling of products and services over the Internet. It had included the handling of purchase(67)and funds transfers over computer networks from its inception.

(74)is a clickable string or graphic that points to another Web page or document.