第1个回答 2019-04-13
the keyboard is the most often used as well as the most important PC output appliance .by using the keyboard ,you can type letters,numbers,marks(不仅仅是标点符号,而应该是所有的符号吧?所以我用的是符号的总称),etc.into a computer in order to send instructions,input datas or do other operations.
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