题目内容

端口汇聚的主要功能有（）。

A. 提升交换机间的带宽
B. 提供链路冗余
C. 隔绝冲突域
D. 生成一条树路径

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共享式以太网的缺点主要有

A. 网络规模有限
B. 网络距离有限
C. 带宽与接入主机数成反比
D. 无法实现结构化布线

Part I Directions:Fill the blanks according to what you hear.（每空10分）Self-Driving Car Kills PedestrianA self-driving Uber car that was part of a1 project hit and killed a pedestrian in Arizona this week. Neither the car nor the human safety driver2 for the woman who was pushing her bike on the3 . This is the first known fatality4 by a self-driving car in the US. Experts believe the sensors did not5 that the6 was a person, since the woman was 7 a bike that was carrying bags. Uber and a few other companies have8 their driverless fleet as investigators 9 who or what is at 10.

请列举出我国京剧四大名旦

控制系统的基本要求是_、_、_，主要是针对系统_（动/稳）态提出的。