【单选题】【消耗次数：1】
保持微型计算机正常运行必不可少的输入输出设备是______。
①
键盘和鼠标
②
显示器和打印机
③
键盘和显示器
④
鼠标和扫描仪
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①
打印机的价格远较显示器为高
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打印机的打印分辨率大大高于显示器
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