题目内容
The windows troubleshooting utility that identifies and eliminates nonessential files is called _____.
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When a file is broken up into small parts that are stored wherever space is available, the hard disk is said to become _____.
Before sending a large file over the Internet, you might want to use one of these programs.
A computer can become infected with viruses in all the following ways, except by _____.
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.
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