二尖瓣关闭不全()二尖瓣狭窄() ["A．收缩期关闭有裂孔","B．收缩期瓣口左房侧有血流频谱","C．两者均有","D．两者均无"]
弥漫性肝癌()肝血管瘤() ["A．小于或等于1cm低回声结节","B．门静脉内栓子","C．两者均有","D．两者均无"]
肾外伤()腹膜后出血() ["A．肾包膜下出血可见包膜下液暗区 ","B．肾周出血可见肾周液暗区、包膜不完整","C．两者均有","D．两者均无"]
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"]
声频低于：16kHz()声频在20kHz以上()声频在16～20kHz之间()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()
