您还可以使用会话ejb组件来代替命令层。
You can also replace the command layer with session EJB components.
这4个层共同包含了表示完整的企业应用程序的组件。
Together these four layers contain the components that represent the complete enterprise application.
通常，我们将在所有层中选择某些模型组件（步骤4）。
Normally we will choose some model components at all layers (Step 4).
在软件中利用三层体系构架和COM组件技术。
In the software, three-layer architecture and COM technology are employed.
在软件中利用三层体系构架和COM组件技术。
In the software, three-layer architecture and COM technology are employed.
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