The protocol stack of wireless sensor networks is composed of physical level, logical link control level, 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。
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。
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.
采购是工程项目成本优化的关键环节，成功的采购不仅来自于采购方的采购行为，更依赖于高水平的采购管理。
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