【单选题】【消耗次数：1】
DMA访问主存时，让CPU处于等待状态，等DMA的一批数据访问结束后，CPU再恢复工作，这种情况称作_____。
①
停止CPU访问主存
②
周期挪用
③
DMA与CPU交替访问
④
DMA
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