题目内容

What is uncertain as for the man?

A. Whether to change his major or not.
B. The importance of language skills.
C. His concrete work after graduation.
D. The payment of his tuition.

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滑动窗口协议用于()的协议。
A差错控制
B流量控制
C拥塞控制
D链路管理

OSI参考模型中,()层、()层和()层构成了低层开放的网络通信平台。
A物理层
B数据链路层
C网络层
D会话层

What can we learn about the man?

A. He is having a job interview.
B. He is studying hotel management.
C. He is serving a customer.
D. He is preparing for his graduation.

采用p坚持的载波监听策略时,如果此时监听到信道忙,则()。
A停止监听,延迟一个随机时间后再次监听;
B坚持监听直到信道空闲,并以概率P延迟一段时间下,再发;
C坚持监听直到信道空闲,并以概率p发送数据;
D以概率P继续监听,直到信道空闲再发。

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