Theoretical and empirical research on innovation policy mix under digital economy 并列题名:Theoretical and empirical research on innovation policy mix under digital economy Theoretical and empirical research on regional innovation model selection Theoretical and empirical research on the formation of tea price in China Theoretical and empirical research on intergroup relation Theoretical and empirical research on rural revitalization Theoretical and empirical research on market diffusion of movies Theoretical and empirical research on teacher learning Theoretical and empirical research on the ecological and economic symbiotic Theoretical and empirical research on the financing problem of CB