就组织学习发生的方式来看，包括单环学习、双环学习和三环学习等三种模式；
The method of organization learning includes single-loop learning, double-loop learning and triple-loop learning.
其次，电力网络的典型网络结构有环网、放射型、单端供电型、双端供电型等形式。
Secondly the power network's the typical feature are loop structure , radial type, supply fed at one end and supply fed at two ends.
通过严格的理论推导，论证了自适应电流速断保护不仅适用于单回线运行方式，同样适用于双回线或环网运行方式。
Strict theoretical deduction shows that adaptive current fast - tripping protection can be used not only on single - circuit line, but also on double - circuit line.
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