Zhong guo nong di zheng yong wen ti yan jiu : Zhong guo nong di zheng yong wen ti yan jiu/ Zhong guo du sheng zi nv wen ti yan jiu = Zhong guo du sheng zi nv wen ti yan jiu/ Zhong guo nong min gong de zhu fang wen ti yan jiu = Zhong guo nong min gong de zhu fang wen ti yan jiu/ Zhong guo da guo nong ye jing zheng li wen ti yan jiu / Zhong guo nong min gong zhi ye fa zhan wen ti yan jiu = Zhong gong dang shi zhong da zheng yi wen ti yan jiu / Zhong guo jing ji nei wai jun heng wen ti yan jiu =