人体中不会产生多普勒效应的是() ["A．胎心","B．瓣膜","C．正常的心肌组织","D．静止不动的肝组织","E．血流"]
慢性肾功能衰竭有何临床表现？
外隐斜是哪项常有的临床表现() ["A．正视化过程中","B．高AC/A者","C．近视患者","D．隐性远视","E．斜视性弱视患者"]
M型超声是指() ["A．振幅调制型","B．辉度调制型","C．彩色血流显像","D．多普勒频谱显示","E．以上都不是"]
准分子激光光屈光性角膜切削术(PRK)治疗远视时，切削角膜() ["A．周边区基质","B．旁中央区基质","C．中央区基质","D．中央区浅表组织","E．旁中央区浅表组织"]
何谓肺大泡？
