计算机中使用的图像压缩编码方法有多种：JPEG是一种适用范围广、能满足多种应用需求的国际标准。在允许有失真但又不易被察觉的要求下，JPEG一般能将图像数据压缩多少倍?(60)。

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Programmers test a program by running it to ensure that the(74)are correct and that the program produces the desired outcome. If errors do occur, the programmer must make the appropriate change and recheck the program until it produces the correct results. This(75)is called testing and debugging.

Computer hardware engineers research, design, develop, and test computer hardware and supervise its manufacture and(72). Hardware refers to computer(73), circuit boards, computer systems, and related equipment such as keyboards, modems, and printers.

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The major goal of USB was to define an external expansion bus which makes adding(70)to a PC as easy as hooking up a telephone to a wall-jack. USB 2.0 is an evolution of the USB 1.1(71), providing a higher performance interface.

Like　personal　computers,　most　workstations　are(72)computers

The　term　data　is　often　used　to　distinguish()machine-readable　information　from　textual　human-readable　information.

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The　major　technical　areas　of　computer　security　are　usually　represented　by　the　initials　CIA:(66),　integrity,　and　authentication　or　availability.