Which layer of the OSI model provides network services to processes in electronic mail and file transfer programs?

在OSI模型的那一层提供网路服务去处理电子邮件何档案传输程式?。

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The practice makes sure voice electronic mail system model based on 4-tiered architecture is viable and effective.

实践证实了该模型的可行性和有效性。

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The practice makes sure voice electronic mail system model based on 4-tiered architecture is viable and effective.

实践证实了该模型的可行性和有效性。

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