一、概述新建或改善一个运输网会产生经济、社会、文化、政治等多方面的影响,它将使物质、服务和思想交流的范围扩大,从而对一个国家的发展作出贡献。另一方面,新建或改善运输网又需要有适当的预算资金、国家或国际的贷款和信贷。由于预算、贷款和信贷都不是没有限制的,这就 I. Outline The new or improved transport network will have many economic, social, cultural and political impacts. It will expand the scope of exchange of material, services and ideas so as to contribute to the development of a country. On the other hand, new or improved transport networks, in turn, need appropriate budgetary resources, national or international loans and credits. As the budget, loans and credit are not without restrictions, this is