Theoretical-empirical research on investors' legal protection 并列题名：Theoretical-empirical research on investors' legal protection Theoretical and empirical research on intergroup relation Theoretical and empirical research on rural revitalization Theoretical and empirical research on teacher learning Theoretical and empirical research on regional innovation model selection Theoretical and empirical research on tht city residential customer satisfaction a theoretical and empirical research on individual security 并列题名：Theoretical and empirical research on intergroup relation theoretical and practical research on original exhibitions