[名词解释] 脐带脱垂(prolapse of umbilical cord)

胎盘粘连 子宫破裂(rupture of uterus) 病理缩复环(pathologic retraction ring) 诊断食管癌的首选检查方法是() ["A．食管粘膜脱落细胞检查","B．食管X线检查","C．食管CT检查","D．内镜检查及活检","E．超声内镜"] 胎盘嵌顿 脐带脱垂(prolapse of umbilical cord)