婴幼儿的辐射敏感性() ["A．与成人相同","B．高于胚胎儿","C．低于成人","D．低于老年人","E．高于成人"]
脊髓灰质炎病毒病理变化以_____________灰质损害为主。
支气管扩张患者，CT示扩张的细支气管比伴行肺动脉粗，两者共同构成的影像，称为() ["A．葡萄征","B．印戒征","C．晕环征","D．手套征","E．轨道征"]
标记PET显像剂的放射性核素为() ["A．γ光子发射核素","B．中子源核素","C．β射线源核素","D．α射线源核素","E．正电子发射源核素"]
核素肺灌注显像主要诊断的疾病是() ["A．急性肺栓塞","B．慢性支气管炎","C．肺结核","D．肺内占位性病变","E．呼吸道阻塞"]
麻疹的主动免疫，采用_______________措施，国内规定初种年龄为______。
