题目内容
A (An) ( ) is a low-level language in binary code that the computer can understand and execute directly.
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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.
After I finished the last paragraph, I moved the ( ) back to the third paragraph and deleted a sentence.
Whereas the decimal system is based on 10, the ( ) system is based on 2. There are only two digits in the latter system, 0 and 1.
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