[名词解释] 真性发绀

CR中可记录与读出X线影像信息的载体是() ["A．胶片","B．磁盘","C．成像板","D．荧光屏","E．平板探测器"] WHO提出防治骨质疏松的三个原则是补钙、______ 、________。 流行性出血热 下列哪项不会引起双侧肾影增大() ["A．油灰肾","B．急性肾小球肾炎","C．双侧肾盂积水","D．多囊肾","E．双侧重复肾"] 医院获得性肺炎 真性发绀