From an evolutionary point of view, loops seem inefficient because of the redundancy inherent in a looped network.
从进化的观点来看，环状网络固有的冗余似乎使它毫无效率。
Based on optimal principle, a new mathematical model for flow distribution of looped network was put forward.
根据优化原则，建立了环状给水管网流量优化分配的数学模型。
And then, according to the features of the looped power supply network, the paper educes the applied calculating methods of two-node power system and more-than-three-node power system respectively.
之后，结合环形供电网络的特点，给出了二节点和三节点以上环形电力系统短路电流的实用计算方法。
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