题目内容
URLs are（ ）used by Web browsers to locate Internet resources.
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Today most networks use a physical ( ) topology.
( ) shares the feature that they are limited in range: typically they cover one building.
( ) is a program that is often used to help find problems in other programs.
High-level languages must first be translated into a machine language before they can be understood and processed by a computer. This job is often done by ( ).
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