单个应急服务设施点的选址问题，并将其推广到多个应急服务设施点选址的模型．先假定应急服务设施点都选在网络图的顶点处，然后根据应急属性建立具有约束条件的数学模型-Emergency service location problem of single point and extend it to multiple emergency services facility location model. Presuppose emergency service points are selected a