共 11 条
- [1] ANSYS 12.0宝典[M]. 电子工业出版社 , 刘伟, 2010
- [4] 材料力学[M]. 高等教育出版社 , 孙训方,胡增强修订, 2002
- [5] Conservation tillage,local organicresources and nitrogen fertilizer combinations affect maize productivity, soil structure and nutrientbalances in semi-arid Kenya. J.Kihara,A.Bationo,D.N.Mugendi,C.Martius,P.L.G.Vlek. Nutrient Cycling in Agroecosystems . 2011