释义 |
ULSCOCA³¹⁵¹¹¹⁺⁴BNC¹⁷³⁹⁹⁵⁺² 基本例句 n.用户位置服务¹⁰⁰原型ul的复数 This paper mainly introduces the set covering model to analyze locations for urban ULS logistics links. 主要运用集合覆盖模型对城市地下物流系统的物流节点选址问题进行了初步的分析探讨。 dictall This paper summarizes characteristics of urban disasters, explains the definition and characteristics of ULS, and analyzes the main problems existing in Chinese ULS. 本文基于生态安全特点和城市生命线系统特征,分析了目前我国城市生命线系统存在的主要问题; cnki |