单选题下列哪项提示房室交界性期前收缩

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

单选题下列哪项应首选超声检查

单选题利多卡因试验可用于

单选题Austin-F1int杂音出现于下列哪种情况

单选题集合反射和晶状体调节反射合称

单选题老年患者，急性腹痛12小时入院。体检可见肠型，左中下腹饱满，轻度压痛，昕诊肠鸣音12次/分，响亮高亢，无金属音调。提示该患者

单选题关于Litten现象的叙述，不正确的是

单选题A．500mL B．3000～4000mLC．1000mL D．120mLE．300mL

单选题某病人的红细胞为3.2×10 12 ／L，血红蛋白为96g／L，红细胞比容为0.31，其MCH应为

单选题巨幼细胞贫血时，血片中易见到

单选题下列引起慢性腹痛的疾病是

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. /

单选题耳廓上触及痛性结节时多考虑为

单选题患者膝胸位或俯卧位时腹痛可缓解，常见于

单选题目前评价肾小球功能，国际上推荐存临床上使用的是

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A．菊粉B．葡萄糖C．肌酐D．碘锐特

单选题A．水冲脉B．无脉C．交替脉D．奇脉