Study on marketing adjustments and innovation of small and medium-sized enterprises in China Study on marketing ajustments and innovation of small and medium-sized enterprises in China Development & innovation of small and medium-sized enterprises in China 并列题名：Development & innovation of small and medium-sized enterprises in China Study on financing constra ints of small and medium enterprise in China 并列题名：Study on financing constra ints of small and medium enterprise in China Pension insurance participation of small and medium-sized enterprises Research on financing difficulties of small and micro-sized enterprises in China Marketing management of small and medium-sized enterprises 并列题名：Marketing management of small and medium-sized enterprises