单选题男性，20岁，工人，用力打苍蝇时致右肱骨上端骨折，此时应首先考虑是A．肱骨大结节撕脱骨折B．肱骨外科颈骨折C．肱骨解剖颈骨折D．病理骨折E．疲劳骨折

单选题区别血尿和血红蛋白尿的主要方法是

单选题"My own feelings went from disbelief to excitement to downright fear," says Carl Hergenrother, 23, an Arizona undergraduate who verified a large asteroid barreling toward Earth with a 230em telescope atop nearby Kitt Peak. "It was scary, because there was the possibility that we were confirming the demise of some city somewhere, or some state or small country." Well, not quite. Early last week, his celestial interloper whizzed by Earth, missing the planet by 450620 km--a hairbreadth in astronomical terms. Perhaps half a kilometer across, it was the largest object ever observed to pass that close to Earth. Duncan Steel, an Australian astronomer, has calculated that if the asteroid had struck Earth, it would have hit at some 93450 km/h. The resulting explosion, scientists estimate, would have been in the 3000-to-12000-megaton range. That, says astronomer Eugene Shoemaker, a pioneer asteroid and comet hunter, "is like taking all of the U.S. and Soviet nuclear weapons, putting them in one pile and blowing them all up." And what if one them is found to be on a collision course with Earth? Scientists at the national laboratories at Livermore, California, and Los Alamos, New Mexico, have devised a number of ingenious plans that, given enough warning time, could protect Earth from a threatening NEO. Their defensive weapons of choice include long-distance missiles with conventional or, more likely, nuclear warheads that could be used either to nudge an asteroid into a safe orbit or blast it to smithereens. Many people-including some astronomers--are understandably nervous about putting a standby squadron of nuclear tipped missiles in place. Hence the latest strategy, which in some cases would obviate the need for a nuclear defense: propelling a fusillade of cannonball-size steel spheres at an approaching asteroid. In a high-velocity encounter with a speeding NEO, explains Gregory Canavan, a senior scientist at Los Alamos, "the kinetic energy of the balls would change into heat energy and blow the thing apart." Some astronomers oppose any immediate defensive preparations, citing the high costs and low odds of a large object's striking Earth in the coming decades. But at the very least, Shoemaker contends, NEO detection should be accelerated. "There's this thing cal4ed the 'giggle factor' in Congress," he says, "people in Congress and also at the top level in NASA still don't take it seriously. But we should move ahead. It's a matter of prudence." The world, however, still seems largely unconcerned with the danger posed by large bodies hurtling in from space, despite the spectacle two years ago of Comet Shoemaker-Levy 9 riddling the planet Jupiter with mammoth explosions. It remains to be seen whether last week's record near-miss has changed any minds.

单选题 以下对侧柱的描述正确的是（ ） A、位于腰1至腰5脊髓侧角 B、是交感神经节前神经元胞体所在的部位 C、是副交感神经节后神经元胞体所在的部位 D、仅见于胸脊髓节段 E、传导内脏感觉

单选题关于破伤风的叙述，下列哪项是错误的?

单选题 42岁女性，时有右上腹疼痛及镜下血尿，体检时发现腹部正位X线片有一0.5×0.3cm密度增高影，侧位片见该阴影位于第三腰椎前缘之后，首先考虑为 A、胆囊结石 B、胆管结石 C、静脉石 D、上尿路结石 E、肠系膜淋巴结钙化

单选题直肠肛管周围脓肿最常见的病因是

单选题治疗早期胃癌的有效方法是

单选题下列符合休克代偿期血压变化的是

单选题慢性肾衰竭最常见的死亡原因是

单选题A．高钾血症B．低钾血症C．代谢性酸中毒D．低钙血症

单选题诊断原发性肝癌的特异性指标是

单选题垂体腺瘤：

单选题女性，58岁，诊断为急性坏疽性阑尾炎伴弥漫性腹膜炎入院，行阑尾切除术。术后第5天腹胀、腹痛、发热，体温39℃，大便4～6次／日，呈水样。肛门有下坠感，腹部有轻压痛，未触及肿块。首先应考虑的并发症是

单选题 男性，35岁，自10米高处失足摔下，来诊时已20分钟。查体:患者神志模糊，脉率110次/分，脉弱，血压9/6kPa(67.5/45mmHg)，腹部膨胀，左季肋区有皮肤擦伤，左后背亦有皮肤擦伤，四肢无明显骨折，以腹部闭合性损伤收入院，下列哪项治疗原则最恰当? A、全面查体，以了解外伤的情况 B、有重点地做辅助检查，以明确诊断 C、腹腔穿刺 D、胸腹透视 E、补充血容量，抢救休克

单选题A．疝内容物为小肠B．疝内容物为大网膜C．疝内容物为Meckle憩室D．疝内容物为多个小肠肠袢E．疝内容物为部分小肠壁

单选题留置导尿管＞3天后，细菌尿的发生率是

单选题A、腰穿显示血性脑脊液的B、典型的中间清醒期C、熊猫眼征及脑脊液鼻漏D、CT和MR无改变的脑外伤E、外伤后即表现为深度昏迷

单选题肛裂最常见于膝胸位A．12点处B．3点处C．6点处D．9点处E．3点和6点处

单选题 2岁男孩两天来急性阵发性哭啼不安，面色苍白，出汗，伴呕吐，果酱样血便，合并腹部腊肠样包块，诊断为肠套叠，此时应采用的治疗原则: A、均可通过空气，或钡剂灌肠复位 B、均应采取手术复位 C、应采取手术复位加肠切除吻合术 D、先应行非手术复位，失败后再手术 E、可行手术复位及肠外置术