单选题关于骨折的合并症，下列哪项不正确

单选题关于气管内捅管下列哪项是不正确的

单选题A．胃大部切除术 B．全胃切除术C．胃肠吻合术 D．胃癌根治术E．高选择性迷走神经切断术

单选题门静脉高压症是指门静脉压力至少到达

单选题下列关于输血的各项操作不正确的是

单选题胆道出血最先出现的临床表现是

单选题有关肠梗阻的叙述，下列哪项是正确的A．切口疝常是引起肠梗阻的原因B．肠壁颜色暗红、水肿、增厚、肠腔扩张，说明肠管已无生机C．X线腹部平片未见液平面，就可排除肠梗阻的诊断D．急性结肠完全梗阻为闭袢性肠梗阻，易引起肠绞窄E．急性肠系膜上动脉血栓形成所致的肠梗阻，多见于青年人

单选题尿毒症发病机制中，“健存”肾单位学说的内容是A．全肾小球受损，仅肾小管健存B．肾脏病时，全部肾单位同时受损C．一批肾单位受损坏死后，又重新再生一批肾单位，以取得代偿D．一批肾单位受损坏死后，剩余的正常。肾单位起代偿作用E．以上都不是

单选题Even before canaries (特高频噪声) were brought into coal mines to alert workers to the presence of poisonous gas, birds were giving us early warning calls signaling the Earth's deteriorating environmental health. Global bird populations have shrunk by up to 25% since preagricultural (农业社会前的) times. Over the past 300 years, farmland has expanded from six percent of the Earth's surface to nearly 33%. Today, three quarters of threatened bird species depend on forests as their principal habitat; each year, however, some 13,000,000 hectares of forests are destroyed, an area the size of Greece. Nearly half the woodlands lost are relatively undisturbed primary forests that are home to a number of sensitive birds and other creatures. Direct exploitation, including hunting for food and capture for the pet trade, is the second greatest danger after habitat loss, while next is the intentional or accidental introduction of non-native species. As people travel to all parts of the globe, so too do the pests and pets that prey on, out-compete, or alter the habitat of native wildlife. Pollution poses an additional risk, affecting 12% of the threatened bird species. In addition to direct poisoning from fertilizer and pesticide applications, runoff of chemicals contaminates the wetlands that migrating waterfowl rely on. Persistent organic pollutants accumulate in the food chain and can lead to deformities, reproductive failure, and disease in birds. Worldwide, one-third of plant and animal species could become extinct by 2050 as a result of climate change, a relatively new threat. Global temperature spikes have brought severe alterations to the migration, breeding, and habitat ranges of some birds. In addition to these looming dangers, seven percent of threatened bird species are at risk from incidental mortality. A rapid decline in seabird populations over the last 15 years corresponds with the growth in commercial longline fisheries. In Europe, Central Asia, and Africa, electrocution on power lines has caused the mass mortality of raptors. Moreover, countless birds die each year from collisions with windows, the number-one cause of U.S. avian mortality. If birds disappear, so do the economically valuable services they provide. Preventing the extinction of additional bird populations depends largely on protecting the world's remaining wild spaces and preserving the health of our natural and altered ecosystems. Reports that the ivory-billed woodpecker, long thought to be extinct, is still with us thrilled bird watchers and others, but this sort of second chance seldom occurs in nature. Even with continued habitat protection, once wildlife populations drop dramatically, a rebound is far from guaranteed. Without stabilizing climate and human numbers, putting fences around all the parks in the world will not lie enough to protect threatened species.

单选题后尿道损伤后，有人不主张早期施行尿道复位手术，主要是出于以下几种考虑，但除外

单选题直肠痛最常见的远处转移是（ ）

单选题子宫外子宫内膜异位症最常见于

单选题A．间歇性肉眼血尿B．尿流突然中断C．膀胱刺激症状D．排尿滴沥及会阴疼痛，严重者引起尿潴留

单选题以下哪一项是直肠排便功能最重要的环节A．直肠下段发生排便神经反射B．结肠的蠕动，粪便下行C．直肠能分泌黏液D．外括约肌的自主松弛E．腹压的增加

单选题A．药物治疗如激素、α受体阻滞剂B．导尿C．前列腺切除或经尿道电切前列腺D．膀胱造瘘以下患者应采取的措施：

单选题A．苦笑面容B．张口困难C．颈项强直D．高热

单选题A．4～5天 B．6～7天 C．7～9天 D．14天

单选题肝移植最恰当的适应证是

单选题下列选项中，最能体现宫颈原位癌特点的是

单选题关于慢性阑尾炎的叙述，下列哪项不正确