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方法应用彩色多谱勒超声检测137例孕10至17周的正常胎儿心脏四腔结构。
Methods Computerized ultrasonic doppler system was used to study the four-chamber view of 137 fetal hearts from 10 to 17 weeks of gestation.
介绍了较佳的多腔精密医用导管机头结构，并对两类典型多腔精密医用导管的机头定型段流场进行了数值模拟分析，获得了出口截面上的速度分布图。
By simulating of melts flow in the die for two type of multi-lumen precise medical catheters, distribution of velocity at the exit of die were obtained.
该天线由含有背腔结构的盘锥天线、盘锥顶盘与地板之间的短路结构、以及多板天线三个部分复合而成。
The antenna is composed of three antenna parts: the cavity-backed discone antenna, the short-circuited structure between the top plate of the discone and ground, and the multi-plate antenna.
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