What is the task of the one worker on the Victoria Line train?
A.To drive the train after it is started automatically.
B.To start the train and to drive it when necessary.
C.To take care of the passengers on the train.
D.To send commanding signals to the command spot.
第8题
IEEE802.3标准,定义了CSMA/CD总线介质访问控制子层与 ______。
A.服务器软件
B.路由器协议
C.物理层规范
D.通信软件结构
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