The architect refines the system-level classes to design the business-layer interface.

架构师对系统层类进行改进以设计业务层接口。

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OPC Standard is selected as upper layer interface in contrast with EPA Specification as bottom layer interface in EPA Data Server based on OPC.

基于OPC标准的EPA数据服务器选择OPC标准作为上层接口，选择EPA规范作为底层接口。

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The model divided GUI into four-layers: Windows framework layer, interface element layer, functional structure layer and running record layer.

模型将GUI分为窗口框架层、界面元素层、功能结构层和运行记录层四层。

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The model divided GUI into four-layers: Windows framework layer, interface element layer, functional structure layer and running record layer.

模型将GUI分为窗口框架层、界面元素层、功能结构层和运行记录层四层。

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