题目内容

一次传送一个字符，每个字符用一个起始码引导，一个停止码结束。如果没有数据发送，发送方可以连续发送停止码。这种通信方式是（）。

A.异步传输；
B.块传输；
C.同步传输；
D.并行传输。

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