单项选择题
A.物理层 B.链路层 C.网络层 D.应用层
A.10BsesT B.100BsesT2 C.100BsesT4 D.100BsesTX
A.10BASE2 B.10BASET C.100BASEFL D.1000BASESX
A.2个字节 B.4个字节 C.6个字节 D.8个字节
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