A chorionic villus is a minute vascular projection on the fetal chorion.绒膜绒毛是胎儿绒毛膜上的一种微小的血管凸出物.Resembling the chorion; membranous.类似绒毛膜的; 膜的.The abstracted tissue contained normal endometriu m , remaining decidua and a s...
The authors show that the hyperboloid of one sheet and the hyperbolic paraboloid are ruled surfaces.作者证实:单叶双曲面和双曲抛物面是直线曲面.The mathematical model of the hyperboloid twist drill was introduced.介绍了以旋转单叶双曲面作麻花钻钻尖后刀面的数学模型.The...