1.Bilaminar and trilaminar germ discs. 2.Describe the formation and derivatives of ectoderm, mesoderm and endoderm. 3.The components of fetal membrane and their functions. 4.Structure and function of placenta. 5.Composition of Placenta barrier
§3-1 Principles of bending 弯曲变形分析 §3-2 Springback 弯曲回弹 §3-3 Design of bending press 弯曲工艺计算 §3-4 Design of bending die 弯曲模计算 §3-5 Structure of bending die 弯曲模结构