胸膜凹陷征形成的病理基础是() ["A．肿瘤瘢痕收缩","B．瘤内含气、扩张的细支气管","C．肿瘤内残存正常含气肺组织","D．肿瘤钙化或包埋原有钙化灶所致","E．癌细胞浸润及间质反应"]
麻疹的临床特征为__________、__________、_________、_________、___________。
关于肺梗塞CT表现哪项不正确() ["A．肺外围部楔形致密影","B．急性期病变肺体积减小","C．楔形病变顶端见血管影","D．单发或多发空洞","E．病变内可见小透亮区"]
肺隔离症的CT表现，错误的是() ["A．多为类圆形肿块灶","B．多位于左下叶后基底段","C．早期明显强化","D．病变实质密度，不含气","E．边缘清晰"]
在核素肝胆显像中，先天性胆道闭锁的影像特点是() ["A．肠道24小时仍不出现放射性","B．胆道延迟至4小时不显影","C．胆囊延迟至4小时不显影","D．肝脏延迟显像","E．以上4种情况都不出现"]
风疹的特点是____________、______________、___________________。
