As a main method of distributing society resources and welfare, pricing problem is usually the core of economics research, supply chain research and marketing research.
The isoline chart is the main form of expressing space distributing characteristic of geographical factor, and it has the common characteristic of being direct, accurate, scientific, readable.
等值线图是表示某一地理要素空间分布特征的主要形式，具有直观、准确、科学、可读性强等共同特征。
3
The oil content and the type and content of main component in oil showed distinct geography distributing.