Combined with layer planning model, it also discusses the planning of backbone layer, distribution layer and leading-in layer of optical fiber access network in city.

结合光纤接入网分层规划模型模型，对城市光纤接入网的主干层、分配层和引入层的规划设计进行了探讨。

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Then, a service-oriented workflow performance evaluation model was put forward, which combined the performances of strategic layer, business layer, service layer and IT layer.

在此基础上，提出了面向服务的工作流性能评价模型，并将战略层、业务层、服务层与IT层的性能很好地加以结合。

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The utility model provides a combined tile which has a multi-layer step structure, wherein each layer comprises at least two tile pieces;

一种组合瓦，为多层阶梯形结构，每一层包括至少两块瓦片；

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