血液性缺氧的血氧指标变化是() ["动脉血氧分压下降","动脉血氧含量正常","动脉血氧饱和度下降","血氧容量降低","动-静脉氧含量差增加"]
慢性胃炎应考虑手术治疗的是() ["A.有脐状突起","B.有溃疡形成","C.有重度不典型增生","D.有反复性上消化道出血","E.有血管透见"]
白喉流行期间作流行病学调查,取石某鼻咽部分泌物,分离培养到细菌后,鉴定其是否是产毒菌株的最好方法是() ["亚碲酸钾血平板黑色菌落","CAMP试验","药敏试验","Elek平板毒力试验","Albert染色"]
诊断室性心动过速最有利的证据是()。 ["QRS波群宽大畸形","心率140~200次/分","QRS时限>0.12秒","房室分离且心室率快于心房率","节律轻度不齐"]
下列哪一项常可提示乳腺病()。 ["月经周期紊乱","乳房周期性胀痛","乳房局限性肿痛","乳房内多个小肿块","乳房内单个无痛性肿块"]
大横定位()。天枢定位()。