The protocol stack of wireless sensor networks is composed of physical level, logical linkcontrollevel, network level, transport level and application levels.
无线传感器网络协议栈由物理、数据链路、网络、传输和应用五层组成。
2
Measurement and control of Liquid Level is an important link on controlling of pharmaceutical tank.
液位的测量与控制是制药厂储液塔罐控制的重要组成环节。
3
Procurement is the crucial link of project cost optimization. The successful purchasing behavior that not only comes from in buying side more relies on the procurement control of high level.