Study on the level of social assistant in China 并列题名：Study on the level of social assistant in China study on the system of concealment in ancient China Study on problems of social assistance right in contemporary China Study on problems of social assistance right in contemporary China. a study on the modernization of social relationship in China study on the transfer of rural labor in China Empirical study on the level of natural sciences research in China 并列题名：Study on problems of social assistance right in contemporary China study on early social work practice in China