【单选题】
在OSI参考模型中能实现路由选择、拥塞控制与互联功能的层是___。
A. 传输层
B. 应用层
C. 网络层
D. 物理层
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答案
C
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在下面对OSI参考模型的数据链路层的功能特性描述中，哪一项是不正确的？___
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【单选题】
下面属于TCP/IP协议族中网络互联层协议的是___。
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【单选题】
Having practiced so many times, I feel very ___ of my ability to deliver the presentation successfully.
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It was when I read his letter ___ I realized he had given me huge help.
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