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【单选题】
关于 OSI参考模型各层功能的描述中,错误的是 。A.
物理层基于传输介质提供物理连接服务
B.
网络层通过路由算法为分组选择提供路径
C.
数据链路层为用户提供可靠的端到端服务
D.
应用层为用户提供各种高层网络应用服务
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【单选题】听力原文： Publicity is any promotional communication about an organization or its products that is presented by the media but is not paid for by the organization. Publicity usually takes the form. of a ne...
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