【摘要】 衡量某一种运输方式的发展水平一般用其自身的纵向景气度指标 .建立了横向动态景气度指标 ,使评价某一种运输方式的发展水平更加全面和合理 .给出了横向动态景气度指标的定义及计算公式 .由实例说明这一衡量指标是可操作的、实用的 .更多还原

【Abstract】 Usually,the longitudinal PIis used to evaluate the developmentlevel of one kind of transporta- tion mode.But the transverse PI presented here advances the former PI and is proved more general and reasonable.The definition and formulas were introduced in the thesis.The new PI is testified to be opera- ble and applied through one example.更多还原