The computer is a useful machine.It is the most im

发布时间：2021-02-24 09:38:13

The puter is a useful machine.It is the most important invention in many years.The oldest kind of puter is the abacus(算盘),used in China centuries ago,but the first large,modern puter was buil

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1A.2D.3C 4D 5A
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