spinning

By adopting the basic dynamic theory of exercise biomechanics,the paper analyzes the hitting of the balls and the moving and the spinning of the main ball from the point of biomechanics and draws some conclusions which are of reference to the practice of Cuqiu.

运用碰撞、刚体平面平行运动等基本的力学原理对蹴球的蹴击和主球的滑动与旋动进行了具体的生物力学分析,得到了若干对蹴球实践有指导作用的结论。

Trophoblast cells invaing the placenta bed and change of spiral arteries and microvessels in pre-eclampsia;

子痫前期胎盘床滋养细胞浸润程度及其螺旋动脉和微血管的变化

Application of color Doppler ultrasonography in detection of spiral artery;

彩色多谱勒超声检测螺旋动脉的应用

Imaging , blood flow spectrum of peritrophoblastic blood flow and uterine artery and helicine artery were analyzed,and Vs,V d and RI were measured.

方法 :应用阴道 CDFI超声对 15 2例临床疑诊异位妊娠患者附件区包块的二维声像图、滋养血流及子宫动脉、螺旋动脉的频谱特征进行对照分析 ,对 Vs、Vd、RI值进行测量分析。