题目内容

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.

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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。

高倍数泡沫灭火剂的发泡倍数在()倍之间。

A. 0.2~20
B. 20~200
C. 200~1000
D. 1000~2000

In the mans opinion, the woman had better______.

A. take a bus to that place
B. drive his car to that place
C. ride his bike to that place
D. let him take her to that place

传输介质的特性可以从()、()、()、可允许直连的最长距离及价格等方面来衡量。
A物理结构
B连通性
C价格
D抗干扰性