单选题急性细菌性痢疾的肠黏膜表面的假膜不具有

单选题下述哪种情况下查体时会出现“三凹征”

单选题关于血液透析患者高血压的治疗不恰当的是

单选题属于炎症性增生的病变是

单选题男性，66岁，3年前患前壁心肌梗死，1年前诊断为慢性心力衰竭，左室射血分数33％。患者平时无症状，应当长期服用的药物不包括

单选题A．孤束核腹外侧B．后疑核平面的尾段腹侧呼吸组C．前包钦格复合体D．PBKF核群E．下丘脑

单选题肾病综合征患者，下列哪项病理类型初次治疗可单独应用糖皮质激素，而不同时加用细胞毒药物

单选题有关张力性气胸的说法中不正确的是

单选题下列有关貅结核的描述，哪项是错误的( )(1996年)

单选题B型胃炎主要的发病原因是

单选题A．血清铁降低，血清铁蛋白升高，转铁蛋白饱和度降低B．血清铁升高，血清铁蛋白升高，转铁蛋白饱和度升高C．血清铁降低，血清铁蛋白升高，转铁蛋白饱和度升高D．血清铁降低，血清铁蛋白降低，转铁蛋白饱和度降低

单选题男性，72岁，持续胸痛伴呕吐、大汗6h，血压80／50mmHg，窦性心律，45bpm，心电图示下壁和右室梗死，不合理的处置是

单选题A．生长激素B．甲状腺激素C．两者都是D．两者均否

单选题下列关于高血压所致靶器官并发症的叙述，错误的是A．血压急剧高可形成脑部小动脉的微动脉瘤B．高血压脑病的临床表现在血压降低后可逆转C．是促使冠状动脉硬化的病因之一D．长期持久高血压可致进行性肾硬化E．严重高血压可并发主动脉夹层

单选题治疗肺结核大咯血首选

单选题Remember Second Life, the virtual world that was supposed to become almost as important as the first one? Now populated by no more than 84,000 avatars at a time, it has turned out to be a prime example of how short-lived Internet fads can be. Yet if many adults seem to have given up on virtual worlds, those that cater to children and teenagers are thriving. Several have even found a way to make money. In America, nearly 10 million children and teenagers visit virtual worlds regularly, estimates eMarketer, a market researcher-a number the firm expects to increase to 15 million by 2013．As in January, there were 112 virtual worlds designed for under-18s with another 81 in development, according to Engage Digital Media, a market research firm. All cater to different age groups and tastes. In Club Penguin, the market leader, which was bought by Disney in 2007 for a whopping $ 700 million, primary-school children can take on a penguin persona, fit out their own igloo and play games. Habbo Hotel, a service run from Finland, is a global hangout for teenagers who want to customise their own rooms and meet in public places to attend events. Gala Online, based in Silicon Valley, offers similar activities, but is visited mostly by older teens who are into Manga comics. Not a hit with advertisers, these online worlds earn most of their money from the sale of virtual goods, such as items to spruce up an avatar or a private room. They are paid for in a private currency, which members earn by participating in various activities, trading items or buying them with real dollars. This sort of stealth tax seems to work. At Gala Online, users spend more than $1 million per month on virtual items, says Craig Sherman, the firm's chief executive. Running such a virtual economy is not easy, which is why Gaia has hired a full-time economist to grapple with problems that are well known in the real world, such as inflation and an unequal distribution of wealth. There are other barriers that could limit the growth of virtual worlds for the young, but the main one is parents. Many do not want their offspring roaming virtual worlds, either because they are too commercial or are thought to be too dangerous. Keeping them safe is one of the biggest running costs, because their sponsors have to employ real people to police their realms. Youngsters are also a fickle bunch, says Simon Levene of Accel Partners, a venture- capital firm. Just as children move from one toy to another, they readily switch worlds or social networks, often without saying goodbye. Even so, Debra Aho Williamson, an analyst at eMarketer, believes "these worlds are a training ground for the three-dimensional web". If virtual worlds for adults, which so far have been able to retain only hardcore users, manage to hang on for a few years, they may yet have a second life.

单选题下列与感染相关的风湿病是( )(2012年)

单选题结核性腹膜炎病人的发热特点错误的是( )(2002年)

单选题女性，50岁，确诊肺癌2年，3h前突发呼吸困难；查体：BP100／60mmHg，肺部体检未见异常，P 2 ＞A 2 ，右下肢水肿。下一步最适宜的诊断检查是

单选题心绞痛进食过饱的严重后果是（ ）