【单选题】【消耗次数：1】
在中断方式下，CPU和外设是处于（??）工作。
①
串行
②
并行
③
部分重叠
④
交替
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相关题目
【单选题】
接口是指不同设备之间为实现互连和通信商具有的对接部分。微型计算机有三类接口，即总线接口、串行口和并行口。串行口是指()。
①
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④
主机和接口之间、接口和外设之间均采用串行传送
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