What was the most important document produced between China and the United States when
查看答案
下列属于OSI参考模型中运输层协议或标准的是 【 】
A. HDLC协议 B.TCP协议 C.X.25协议 D.RS--232标准
不转发广播的网络互连设备是 【 】
A. 二层交换机 B.路由器 C.集线器D.中继器
6 OSI参考模型中位于会话层之上,应用层之下的层是 【 】
A. 物理层 B.运输层 C.表示层 D.数据链路层
What were the two countries Elizabeth I successfully played off against each other for