【单选题】【消耗次数：1】
在有关串行通信的叙述中，正确的是
①
串行通信最少只需要一条导线
②
所谓半双工是指在一半工作时间内工作
③
异步串行通信是以字符为单位逐个发送和接收
④
同步串行通信的收、发双方可使用各自独立的本地时钟
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