慢性胰腺炎()胰头癌()胆总管下段梗阻()肝总管梗阻() ["A．胰管串珠状扩大","B．胰管均匀性增大","C．胰管不扩大而胆总管、胆囊及肝内胆管扩大","D．胆总管及胆囊显示不清，而左、右肝内胆管扩大","E．胆囊肿大"]
发生肾的任何部位的圆形、壁光滑的、内为液暗区与后壁回声增强()肾窦内见大小不等互相连通的液暗区() ["A．肾孤立性囊肿","B．多囊肾","C．肾积水","D．肾肿瘤坏死液化","E．肾乳头状囊腺瘤"]
脑室内见到回声增强的物质()脑实质内见到回声增强的物质() ["A．脑实质出血","B．脑室内出血","C．室管膜下出血","D．蛛网膜下腔出血","E．硬脑膜下出血"]
什么情况下可获得最大的多普勒频移() ["A．当声束以锐角入射到血管上时","B．当声束以垂直方向入射到血管上时","C．当声束与血管平行入射时","D．声束对多普勒无影响","E．声束角越大频移越大"]
当光照增强时，瞳孔缩小，此反射称为() ["A．瞳孔近反射","B．直接缩小反射","C．瞳孔对光反射","D．直接光反射","E．减弱的瞳孔开大反射"]
声频<16kHz()声频>20kHz()声频为16～20kHz()纵向分辨力直接取决于()周期与某个脉冲中的循环周期数之积为()
