题目内容
( ) is the basic software that controls a computer.
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The most widely used OS in the world is ( ) which provides users with a graphical user interface.
A (An) ( ) is a low-level language in binary code that the computer can understand and execute directly.
A ( ) is a set of rules that controls the interaction of different devices in a network or internetwork.
Unix is a ( ) operating system with a command-line interface.
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