呼吸衰竭时,引起低氧血症和高碳酸血症的主要原因是() ["通气不足","通气/血流比例失调","弥散障碍","氧耗量增加","呼吸性酸中毒"]
多发性硬化的MRI典型表现是() ["T2像可见皮质散在的高信号硬化斑","侧脑室周围白质多数T1低信号、T2高信号的类圆形或融合性斑块","T2像可见脑室前角片状高信号硬化斑","可见脑室后角片状高信号硬化斑","T2像可见丘脑高信号硬化斑"]
可直接测定RR的研究是()。 ["病例对照研究","队列研究","普查","筛查","生态学研究"]
男性,35岁,支气管哮喘史20年。2天前出现咳嗽伴气喘,吸入沙丁胺醇症状稍缓解。今日气急加重。查体:焦虑,大汗,口唇发绀,呼吸34次/分,心率130次/分,有奇脉,两肺广泛哮鸣音。应立即做哪项检查() ["A.胸部X线","B.动脉血气分析","C.呼吸功能测定","D.心电图","E.血常规"]
"二尖瓣"型心脏形态基本X线特征表现是() ["主动脉弓缩小","心尖上翘","左右心缘饱满","心脏呈"梨"形","肺动脉段凹陷"]
冷态启动中升压速度的控制对汽包金属壁热应力的有何影响?