The thesis chooses the four-layers structure as the rudiment of our protocol stack system, which includes physical layer, data link layer, network layer and application layer.
本文选择了四层结构作为协议栈体系结构的雏形，即：物理层、数据链路层、网络层、应用层。
The paper analyzes the faults of four-link sealing device and introduces the structure and characteristics of all-metal flexible magnetic sealing.
分析了烧结机头尾密封四连杆密封装置存在的缺陷，介绍了全金属柔磁密封的结构和特点。
With double oil cylinders, four-column guide and automatically balancing link rod structure to ensure the completely same cutting depth of each cutting position.
采用双油缸、四柱导向，自动平衡连杆机构，保证每一个裁断位置的裁断深度完全相同。
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