关于串行和并行传输的正确表述是
A.两者分别用于发送和接收数据
B.两者分别用于同步和异步系统
C.两者的区别在于发送每个字符所需的位数不同
D.两者的区别在于数据是在一条还是多条信道上传输
正确答案是D
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