用哪种探头可提高轴向分辨力() ["A．高频探头","B．低频探头","C．较大的探头","D．低阻尼探头","E．以上均不可"]
何谓败血症、脓血症、毒血症、菌血症？
简述何谓侵蚀性溃疡。
下列哪种方法不能矫治散光() ["A．硬性角膜接触镜","B．表面角膜镜片术","C．准分子激光角膜切削术","D．准分子激光角膜原位磨镶术","E．白内障摘除人工晶状体植入术"]
囊肿的声像图特征是() ["A．边界回声不定","B．外形不定","C．内部无回声","D．后方回声衰减","E．侧缘声影不定"]
简述何谓“狮面”。
