It is an important problem to find out the variation area factors of the postal service cost of various province (city) in the postal management and economy.
如何描述各省市区局各类邮政业务成本随地区因素变化的规律，是邮政经济和管理中一个十分重要的基础性问题。
It is an important problem to find out the variation area factors of the postal service cost of various province (city) in the postal management and economy.
如何描述各省市区局各类邮政业务成本随地区因素变化的规律，是邮政经济和管理中一个十分重要的基础性问题。
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