Because of its inherent sociality , reciprocity and modulability , the social security forms a stable mechanism of modern society 社会保障由于其内在的社会性、互济性、调节性，构成了现代社会的稳定机制。
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The paper introduced a phase range system based on fpga embedded technology . three functional module in the range system : modulability signal generation source , information control unit and information management unit , can be designed in one pld chip , so a majority of shortcomings of traditional phase laser range were conquered by this excellent innovation in circuits 本文介绍了一种基于fpga嵌入式技术的相位激光测距系统,该系统采用先进的fpga技术,实现了调制信号产生、信息控制与处理各模块的整合,解决了传统相位激光测距所难以克服的弱点。
