单选题关于Litten现象的叙述，不正确的是

单选题以下对于大气道狭窄性质判定的V-V环表现，错误的是

单选题网织红细胞明显增多见于

单选题能较早判断肾小球损害的检查是

单选题湿罗音满布双肺野多见于

单选题AustinFlint杂音和二尖瓣狭窄舒张期杂音的主要辨别点在于

单选题与Babinski征意义相同的病理征是

单选题女，45岁，查外周血Hb90g／L，RBC2．85×10 12 ／L。外周血涂片靶形红细胞占26％，本例诊断为

单选题诊断急性肝炎或慢性肝炎活动期最敏感的试验项日是

单选题Galloway, a mostly middle-class community northwest of Atlantic City, is part of a wave of districts across the nation trying to remake homework amid concerns that high-stakes testing and competition for college have fueled a nightly grind that is stressing out children and depriving them of play and rest, yet doing little to raise achievement, particularly in elementary grades. Such efforts have drawn criticism from some teachers and some parents who counter that students must study more, not less, if they are to succeed. Even so, the anti-homework movement has been reignited in recent months by the documentary Race to Nowhere, about burned-out students caught in a pressure-cooker educational system. "There is simply no proof that most homework as we know it improves school performance," said Vicki Abeles, the filmmaker and a mother of three from California. "And by expecting kids to work a 'second shift' in what should be their downtime, the presence of schoolwork at home is negatively affecting the health of our young people and the quality of family time. " So teachers at Mango Elementary School in Fontana, Calif., are replacing homework with "goal work" that is specific to individual student's needs and that can be completed in class or at home at his or her own pace. The Brooklyn School of Inquiry, a gifted and talented program, has made homework optional. "I think people confuse homework with rigor," said Donna Taylor, the Brooklyn School's principal, who views homework for children under 11 as primarily benefiting parents by helping them feel connected to the classroom. Research has long suggested that homework in small doses can reinforce basic skills and help young children develop study habits, but that there are diminishing returns. Still, efforts to roll back homework have been opposed by those who counter that there is not enough time in the school day to cover required topics and that homework reinforces classroom learning. In Coronado, Calif. , the school board rejected a proposal by the superintendent to eliminate homework on weekends and holidays after some parents said that was when they had time to help their children and others worried it would result in more homework on weeknights. Homework wars have divided communities for over a century. In the 1950s, the Sputnik launching ushered in heavier workloads for American students in the race to keep up with the Soviet Union. The 1983 report "A Nation at Risk" and, more recently, the testing pressures of the No Child Left Behind law, also resulted in more homework for children at younger ages. A few public and private schools have renounced homework in recent years, but most have sought a middle ground. In Galloway, the policy would stipulate that homework cover only topics already addressed in class. Dr. Giaquinto, Galloway's superintendent, said the goal of the proposed policy was to make homework "meaningful and manageable," noting that teachers would have to coordinate assignments so that a student's total homework would not exceed the time limit.

单选题不属于胃镜检查的适应证是

单选题下列情况下出现胸式呼吸减弱的是

单选题A．三叉神经受损B．面神经受损C．舌咽神经受损D．舌下神经受损

单选题需了解慢性肝病肝脏功能受损程度时应选择

单选题女性，30岁，转移性有下腹痛10小时，除考虑急性阑尾炎外，还应考虑

单选题贫血病人的MCV68n、MCH26pg、MCHC234％，贫血属于

单选题胃镜检查时，患者体位

单选题水肿这一症状的概念不包括

单选题双侧上眼睑下垂见于

单选题进行纤维支气管镜检查时，进镜应