9.OSI参考模型按功能将网络划分为7层，其中最上层（第7层）是-湖北继续教育网网校

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[单选题]9.OSI参考模型按功能将网络划分为7层，其中最上层（第7层）是

A应用层

B会话层

C网络层

D传输层

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