交通运输既是衔接生产和消费的一个重要环节,又是保证国家在政治、经济、文化、军事和人民生活等方面保持联系的手段之一。现代化交通运输业包括铁路、公路、水运、航空和管道五种基本的运输方式。鉴于铁路、水运、公路在五种运输方式中比例较大(如:1999年铁路、水运、公路占全国运输总量的98.7％),且运输货物的类别有相似之处,故重点研究铁路、公路、水运和航空运输量的相互关系(划分率)。 Transport is not only an important link between production and consumption, but also one of the means to ensure that the state maintains contacts in political, economic, cultural, military and people’s lives. The modern transportation industry includes five basic modes of transportation: railways, highways, waterways, airlines and pipelines. In view of the large proportion of railway, waterway and highway among the five modes of transportation (eg, railway, waterway and highway account for 98.7% of the national total in 1999) and the categories of goods transported are similar, the railway, Interrelationship between road, water and air transport (delimitation).