简要介绍了城域网的基本概念、网络结构、规划原则，并针对中国铁通城域网建设论述了解决方案。
The essential concepts, network structure and programming principle of metropolitan area network (MAN) are introduced briefly. And the solution for MAN construction of China Railcom is discussed.
在城市中压配电网的规划与改造中，网架结构十分重要，接线模式则是网架结构的基本反映。
Connection modes are the basic reflection of distribution network structure which is the focus of the urban distribution network planning and rebuilding.
首先介绍了无人机任务规划系统的基本功能及组成结构。
Firstly, the basic functions and structure of the UAV mission planning system is introduced.
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