多普勒效应
动脉导管未闭()法乐氏四联症() ["A.肺动脉增宽","B.肺动脉内湍流频谱","C.两者均有","D.两者均无"]
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"]
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() ["A.次声","B.超声","C.可听声","D.空间脉冲长度","E.脉冲宽度"]
肝切面图内见边界清楚之结节且无包膜、周边回声强、内部回声略低于周边并呈筛孔状回声()肝切面图内见强回声或低回声结节、边缘不规则、周边有晕环、内部光点分布不均匀()肝切面内呈龟背样回声()肝切面内见包膜完整、壁薄光滑的圆形液暗区()肝切面内见包膜粗糙、壁厚不光滑、内部呈低回声或液暗区之病变回声区,伴局部压痛明显() ["A.肝血管瘤","B.肝癌","C.肝囊肿","D.肝脓疡","E.血吸虫病性肝纤维化"]
肾外伤()腹膜后出血()