Class structure and social networks in urban China 并列题名：Class structure and social networks in urban China Stratum structure and social networks in urban China 并列题名：Stratum structure and social networks in urban China Urbanization and social network in China social structure and social stratification in contemporary china 并列题名：Urbanization and social network in China Relationship between social and trust in urban China social construction and social development in contemporary china material culture and social status in early moden China