social selection
4.From the angle of maximization of social benefit,a model for the manufacturer′s position selection considering the environmental pollution control cost is presented by examining the pollution made by the manufacturer on environment,turning the pollution control cost into the inside investment cost of the manufacturer and introducing the absorption of pollution by the environment into the model of the maximization of the manufacturer′s income to make the manufacturer′s investment position deviate from the traditional position.
10.The following five parts must he realized in strengthening standardized management of graduation thesis: intensifying guidance to better topic selection of graduation thesis; strengthening inspection and building quality check system of graduation thesis; standardizing oral defense procedure; perfecting graduation thesis evaluation system; enhancing university-enterprise cooperation to seek social support.

