Method The ratio of systolic and diastolic blood stream(S/D value)of umbilic artery was detected by color Doppler ultrasound detector.
方法应用彩色超声多普勒仪器进行胎儿脐动脉血流检测，并分析胎儿及分娩前后情况与血流检测的关系。
2
In this paper, we make use of the properties of the umbilic to research circle Section question of quadric in 3-dimensional Euclidean space.
文章利用脐点的性质研究了二次曲面的圆截口问题，并给出了与二次曲面交线为圆的圆截口的方程的一种求法。
3
In this paper, we make use of the properties of the umbilic to research circle section question of quadric in 3-dimensional Euclidean space. We give the equations of these circle sections.