Based on product differentiation,this paper researches the innovation of agricultural biotechnology. In the duopoly structure,the company’s investment in innov
On the basis of market demand survey of chestnut,this article carries out cost-benefit analysis of the chestnut production in Xingtai County,to understand the p
Based on grading of consolidation potential of rural construction land,coal mining subsidence areas,old towns and " villages within the city" in Bagongshan Dist