【单选题】【消耗次数：1】
控制器是冯·诺依曼计算机五大组成部分之一。它在计算机中的作用是______。
①
只控制主机内部的相应操作
②
只控制主机外部的相应操作
③
控制计算机各部分自动、连续并协调动作
④
数据从内存输出到外存
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