题目内容
A computer can become infected with viruses in all the following ways, except by _____.
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A utility program that makes a copy of all files or selected files that are in the libraries, contacts, and favorites and on the desktop.
_____ software consists of operating systems, utilities, device drivers, and language translators.
A(n) _____ converts the programming instructions into a language that the computer understands and processes.
The _____ system coordinates computer resources, provides the user interface, and runs applications.
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