In an actual system, the architect would design the classes for each software layer (presentation, business, and data access).
在实际的系统中，架构师会为每个软件层(表示层、业务层和数据访问层)设计类。
OSI/RM classify the structure of the network into application layer, presentation layer, session layer, transport layer, network layer, data link layer and physical layer.
OSI/RM将计算机网络将网体系结构划分为应用层、表示层、会话层、传输层、网络层、数据链路层和 物理层七个层次。
OSI/RM classify the structure of the network into application layer, presentation layer, session layer, transport layer, network layer, data link layer and physical layer.
OSI/RM将计算机网络将网体系结构划分为应用层、表示层、会话层、传输层、网络层、数据链路层和 物理层七个层次。
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