A center's service area of a geographic network is broadly applied in practical life. In traditional method, it is expressed by an isochronous area or an equidistance area.
地理网络的中心服务范围在实际生活中应用广泛，传统方法一般用等时区或等距区表示。
A center's service area of a geographic network is broadly applied in practical life. In traditional method, it is expressed by an isochronous area or an equidistance area.
地理网络的中心服务范围在实际生活中应用广泛，传统方法一般用等时区或等距区表示。
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