外围设备即计算机系统中除主机外的其他设备。包括输入和输出设备、外存储器、模数转换器、数模转换器、外围处理机等。是计算机与外界进行通信的工具。例如打印机、磁盘驱动器或键盘。在计算机和其他机器之间，以及计算机与用户之间提供联系。将外界的信息输入计算机；取出计算机要输出的信息；存储需要保存的信息和编辑整理外界信息以便输入计算机。
陈！！！ 18.06.05.03.85.3
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