在Windows操作系统中，要查看已知文件类型的扩展名，需要在磁盘目录下执行命令(4)设置；用键盘上的Delete删除U盘中的文件时，该文件(5)；在硬盘上要直接删除文件而不让文件进入回收站，可以用键盘(6)操作。

(74) systems perform. basic tasks, such as recognizing input from the keyboard, sending output to the display screen, keeping track of files and(75)on the disk, and controlling peripheral devices such as disk drives and printers.

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The Assembly Language is often used to distinguish(73)machine-readable information from textual human-readable information.

The major technical areas of computer security are usually represented by the initials CIA(71)，integrity，and authentication or availability．

Like personal computers，most workstations are(72) computers．

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Windows XP是一种(56)操作系统，为了支持网络通信的功能；在它的网络体系中包含了网络API、传输驱动程序接口(TDI)客户、TDI传送器、NDIS小端口驱动程序和(57)，同时NDIS库也为(58)的使用提供了函数接口。

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