Amniocentesis is the removal of fluid from the amniotic sac.羊膜穿刺术是从羊膜囊抽取羊水的技术.Objective To investigate some questions about ultrasound localization of amniocentesis.目的探讨羊膜腔穿刺术超声定位的有关问题.Amniocentesis is the standard prena...
The unconformity marks the change from fluvial to marginal marine deposition.不整合面标志着河相至边缘海相沉积的相变.Highstand System Tract mainly develops depositional system of offshore - meare, fluvial facies and prograded delta.高位体系域主要发...