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单选

输入输出系统主要有三种方式与主机交换数据,对于这三种方式的描述正确的是(28)。

  • A.程序控制方式最节省CPU时间
  • B.中断方式最耗费CPU时间
  • C.DMA方式在传输过程中需要CPU的查询
  • D.中断方式无需CPU主动查询和等待外设
试题出自试卷《软件水平考试(初级)程序员上午(基础知识)模拟试卷1》
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