Study on the focuS Strategy of e-commerce enterpriSe under the background of "internet+":a caSe Study of kunming ch999 A Comparative Study of Land Economy under Different Ownerships in China Study on pricing decision of new energy vehicle supply chain under Baa S model Implementation of Abstract MAC Layer Under Jamming Development of green urbanization under the guidance of deep ecology Construction of pastoral complex in Guizhou under the background of rural revitalization A New Method of Portfolio Optimization Under Cumulative Prospect Theory A study on fiscal and taxation policies for ecological compensation Pricing strategy in the product and service market E-book研究