Duo zhong jing ying- ke xue ji shu Duo zhong jing ying— ke xue ji shu Ke xue shi yan- ying xiang- ke xue ji shu Nong ye- ke xue ji shu Chu mu ye- ke xue ji shu Guo fang ke xue ji shu Tu ling ji suan ji ke xue cong shu Duo zhong jing ying Ma lie zhu zuo- ke xue ji shu Hua zhong ke ji da xue wen ke xue shu cong shu