单选题 下述哪种物质，可刺激T淋巴细胞发生细胞分化? A、抗体 B、补体 C、植物血凝素 D、绵羊RBC E、小鼠RBC

单选题第一心音分裂常见于

单选题 关于腰椎椎骨脱离与腰椎滑脱症状的描述，错误的是 ( ) A、难以与其他腰痛患者相区别 B、可能因神经根受损而丧失运动与感觉 C、可能发展为严重的腘绳肌紧张，异常步态，走路摇摆，屈髋受限 D、直腿抬高试验时有神经根刺激 E、病情可自然恢复

单选题A．咯血伴胸痛B．咯血伴脓痰C．咯血伴呛咳D．咳粉红色泡沫样血痰

单选题下列哪项心电图改变不支持左房肥大的诊断

单选题下述几个范围何者为正常心尖搏动的位置

单选题A．腹壁揉面感B．板状腹C．腹壁局部紧张度减低D．全腹紧张度减低

单选题A．心浊音界呈靴形B．心浊音界呈梨形C．心浊音界呈三角烧瓶形D．心浊音界变小或叩不出

单选题 女，45岁，骶髂部疼痛三月余。请结合影像图像，选择最可能的诊断 ( ) A、骶髂关节骨折 B、骶髂关节结核 C、骶髂关节炎 D、骶髂骨骨囊肿 E、骶髂骨骨脓肿

单选题下列哪项应首选超声检查

单选题胸骨右缘第2肋间可触及收缩期震颤，临床上常见病变应考虑为

单选题下列有关肺容量的计算下列不正确的是

单选题 合成 DNA的原料是 A、dAMP、dGMP、dCMP、dTMP B、 dATP、dGTP、dCTP、dTTP C、 dADP、dGDP、dCDP、dTDP D、 ATP、GTP、CTP、UTP E、AMP、GMP、CMP、UMP

单选题Jet lag is back on the agenda for business travelers, especially as long-haul international traffic picks up again. There is endless advice online about jet lag. Drugs are frequently mentioned, and a recent favorite is Nuvigil, used to treat excessive sleepiness. Nuvigil's manufacturer, Cephablon, has so far not succeeded in obtaining government approval for its plan to market the drug as a remedy forjet lag. But the approach I hear most often from long-haul travelers involves diet and preparation. " Why would you take a pill that your body then has to shake off? " said Lynne Waller Scanlon, the author, with Charles F. Ehret, of Overcoming Jet Lag, which was a best seller in the mid-1980s but went out of print until she revised and republished it last year under a snappier title, The Cure for Jet Lag. The book lays out a treatment system for jet lag based on pre-trip diet and conditioning to reset the body's internal clock. The book suggests resetting the body clock so that it will be in sync with the time at the destination. One to three days before a trip, the authors suggest low-calorie meals. In flight, avoid or strictly limit alcohol, and use coffee or tea to persuade the body clock that it's daytime. If it's morning after flying all night, resist sleep and " flood your eyes with daylight " , they suggest. While all long-haul travel can cause normal fatigue, travel across time zones causes the body to react with the most pronounced effects of jet lag, including disorientation and a general sense of discomfort. In the last few years, the global airlines have put more emphasis on accommodating the need for in-flight sleep—at least in the business and first—class cabins, where international airlines earn most of their revenue. But at the same time, international airlines also promote extensive in-flight entertainment selections, as well as high-end menus, including quality wine lists, in premium classes. Indulging in these would seem to work against dietary treatment to combat jet lag. But Ms. Scanlon says recovery is nevertheless attainable. " What do you do if you can't implement this program ahead of the trip, or if you've blown it and had a complete debauch on the plane? " she said, " Well, when you get off that plane, you get on the program right away. It may not be perfect, but you will feel much, much better. /

单选题A．支气管哮喘急性发作B．支气管肺炎C．肺间质纤维化D．慢性支气管炎

单选题 脓性精液常见于： A、前列腺炎 B、精囊结核 C、附睾结核 D、附睾肿瘤 E、淋病

单选题耳廓上触及痛性结节时多考虑为

单选题 阵发性室上性心动过速心电图表现正确的是 A、QRS波群增宽>0.12S B、窦性P波融合于QRS波不同部位 C、交界性心动过速频率70～130次/分 D、心律绝对匀齐，P'波常不易辨认 E、心房波形态与窦性P波的形态相同

单选题 为了研究生物大分子的沉降特性和结构，使用了特殊的转子和检测手段，以便连续监测物质在一个离心力场中的沉降过程，这种离心机称为（ ） A、制备离心机 B、制备超速离心机 C、制备高速离心机 D、分析超速离心机 E、普通离心机

单选题 目前有机溶剂、清洁剂法灭活病毒不常用的制剂是 A、磷酸三丁酯(TNBP) B、Tween80 C、乙醚 D、胆酸钠 E、TritonX-100