阐述了交通运输需求与供给行为的理论，并研究了交通运输结构系统和数学模型。
The supply and demand of traffic volume are discussed, some problems of transportation system and their mathematic models are studied.
交通运输规划模型的开发过程，就是运输需求与运输供给的平衡过程。
To develop transport plan model is a balancing transport demand and transport supply.
在建立货币供给模型与货币需求模型之前，首先要回答什么是适度货币量的问题。
It is the first question to answer what is the appropriate amount of money before building the model of money supply and money demand.
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