通风网络平衡图在定量、直观反映通风网络的拓扑关系及各种性质方面，具有优越性。
Ventilation network equilibrium diagram has superiorities in quantitative and intuitional reflecting the topology relation and various properties of ventilation network.
通风网络中存在单向回路时，将无法绘制其所对应的平衡图。
If unidirectional circuits exist in a network, the corresponding ventilation network equilibrium graph can not be plotted.
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