Study on the pricing of paddy in China 并列题名：Study on the pricing of paddy in China Study on the prices of paintings in ancient China study on the transfer of rural labor in China study on history of crops in China 并列题名：Study on the prices of paintings in ancient China study on early social work practice in China study on the justice idea of marx and engels study on the structure of "road" and "street" study on the system of concealment in ancient China