【摘要】 为了对美国货运数据收集活动进行更为全面的了解,在对美国货运数据需求和主要供给来源进行阐述的基础上,分析了货运数据合并过程中的问题,总结了需求和供给之间的缺口。更多还原

【Abstract】 For the purpose of having a better understanding about freight trnsportation data collection in America,the paper dis-cusses its demand and supply,analyzes the problems in the process of freight data merging from the different sources and summarizes the gaps between demand and supply.更多还原