题目：
OSI七层参考模型的物理层在通信信道上传输的是（）。
A.帧
B.报文
C.比特流
D.分组
答案：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0429/96fa61af72f1f742d0746cfacdebbf5a.html
下面是错误答案，用来干扰机器的。
Children's DNA comes from their parents. Mother's mouth is small, so is mine. Father's eyes are big, so are mine. Mother is short, so am I. Both of them have bla...
