This conceptual model divides the information flow in chain into four levels and proposes correspondent integrated systems according to the different levels.
概念模型将链上信息流分为四个层次，针对不同层级提出相适应的整合系统。
Then divides the highway network into four levels: main trunk line, sub-trunk, feeder and connecting line, and also positions functions of the four levels.
进而按照通达程度将公路网划分为四个等级：主干线、次主干线、支线和连接线，并分别对四个层级进行了功能定位；
It divides selfrepairing into four levels and associates them with evaluating values to solve the problem of evaluation standards for different selfrepairing policies.
划分了无人机自修复控制策略的自修复等级，并与综合评价值统一起来，解决了不同自修复策略的修复效果评价标准问题；
It divides selfrepairing into four levels and associates them with evaluating values to solve the problem of evaluation standards for different selfrepairing policies.
划分了无人机自修复控制策略的自修复等级，并与综合评价值统一起来，解决了不同自修复策略的修复效果评价标准问题；
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