Study on China's differentiated investment strategies in central and eastern european countries 并列题名：Study on China's differentiated investment strategies in central and eastern european countries Study on the transformation of welfare systems in Central and Eastern European countries Reports on the cultural development of central and eastern european countries Review of the cooperation between China and Central and Eastern European countries Transportation report in central and Eastern European countries Annual report on the development of central and eastern European countries Development report of overseas Chinese in central and Eastern Europe countries Research on economic and trade topicsin Central and Eastern European countries Study on technological innovation investment and adoption strategies of enterprises in later-development countries