本文介绍了这些层的组成和功能以及相邻层之间的关系。
This article has introduced the compositions and functions of the layers and the relationship between adjacent layers.
文章介绍了直流低压网络智能化管理系统的组成和功能。
This paper introduces the composition and function of DC. low voltage network intelligent management system.
学习了挖泥船的基本知识，理解了其模拟系统的基本组成和功能。
Dredger learning the basic knowledge, understanding its simulation system and the basic function.
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