本文根据系统理论和区域规划的原理，提出了适合于区域性煤炭运输系统的建模方法—内外双层模型法。

This paper puts forward a new building model method-the inter-outer layer method according to the theory of system and the basic principle of regional programming.

youdao

本文根据系统理论和区域规划的原理，提出了适合于区域性煤炭运输系统的建模方法—内外双层模型法。

This paper puts forward a new building model method-the inter-outer layer method according to the theory of system and the basic principle of regional programming.

youdao