The basic data model of transportation network is represented by node-arc model.
传统的交通网络数据模型是用结点-弧段模型来表示的。
Get the vulnerability grade of water supply network through index value of the water node.
由用水节点的脆弱性指标值，得到给水管网的脆弱性等级。
Get the vulnerability grade of water supply network through index value of the water node.
由用水节点的脆弱性指标值，得到给水管网的脆弱性等级。
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