首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   2149681篇
  免费   151600篇
  国内免费   4012篇
耳鼻咽喉   31562篇
儿科学   68211篇
妇产科学   60600篇
基础医学   303843篇
口腔科学   63239篇
临床医学   188315篇
内科学   410512篇
皮肤病学   48850篇
神经病学   169040篇
特种医学   84686篇
外国民族医学   595篇
外科学   328227篇
综合类   48658篇
现状与发展   7篇
一般理论   686篇
预防医学   153720篇
眼科学   51459篇
药学   166067篇
  9篇
中国医学   5066篇
肿瘤学   121941篇
  2018年   20849篇
  2016年   18676篇
  2015年   20835篇
  2014年   28961篇
  2013年   43366篇
  2012年   57910篇
  2011年   61361篇
  2010年   36264篇
  2009年   34627篇
  2008年   57825篇
  2007年   62631篇
  2006年   63431篇
  2005年   60878篇
  2004年   58862篇
  2003年   56684篇
  2002年   55319篇
  2001年   104663篇
  2000年   107471篇
  1999年   90438篇
  1998年   24154篇
  1997年   21708篇
  1996年   21219篇
  1995年   19950篇
  1994年   18501篇
  1993年   17411篇
  1992年   69613篇
  1991年   67237篇
  1990年   66099篇
  1989年   64111篇
  1988年   59143篇
  1987年   58010篇
  1986年   55319篇
  1985年   52421篇
  1984年   38988篇
  1983年   33124篇
  1982年   19356篇
  1981年   17435篇
  1979年   36753篇
  1978年   25826篇
  1977年   22657篇
  1976年   20359篇
  1975年   23098篇
  1974年   27287篇
  1973年   26599篇
  1972年   25331篇
  1971年   23715篇
  1970年   22223篇
  1969年   21393篇
  1968年   19735篇
  1967年   17678篇
排序方式: 共有10000条查询结果,搜索用时 218 毫秒
61.
62.
63.
Behçet disease is a complex, multisystem disease characterized by recurrent oral and genital ulcerations. It rarely occurs in infants or children. Neonatal Behçet disease has been reported in infants whose ulcers resolve at or before 9 weeks of age. Few cases of neonatal Behçet disease persisting into childhood have previously been reported. We report the case of a 1‐month‐old infant who presented with severe recurrent genital ulcerations and at 6 months developed recurrent oral ulcerations. Her orogenital ulcerations continue to recur. Human leukocyte antigen testing revealed HLA‐B51 and B44 positivity. This is a case of pediatric Behçet disease in the neonatal period. Behçet disease should be considered in the differential diagnosis of recurrent genital and oral ulcerations in infants and children.  相似文献   
64.
65.
BackgroundSecond-hand smoking or environmental tobacco smoke is a critical health risk. Children are the most vulnerable to second-hand smoking because of their small bronchial ducts, less developed immunity, and low-physical activity.ObjectivesThe purpose of this study was to ascertain the effects of second-hand smoking on lung functions in athlete and non-athlete school-aged children.MethodsThis observational study included forty-six school-aged children, their age was 8–15 years, assigned to three groups; 2 study groups and 1 control group (n=15). The study groups comprised of 16 football players, and of 15 cyclists. Lung functions were evaluated recording forced vital capacity, forced expiratory volume in 1 sec and peak expiratory flow using digital spirometer.ResultsAll measures were recorded in definite values and the children were also classified into second-hand smoking (SH), or non-exposed to tobacco smoking (NE). The findings presented a significant increase (p<0.05) of the study groups in forced vital capacity, forced expiratory volume in 1 sec and peak expiratory flow solely for the non-exposed children. However, there were non-significant differences between the cyclists and football players or between the passive smoking children and non-exposed children in any of the two study groups (p>0.05).ConclusionThe outcomes of this study suggest beneficial influences of the sports activity on the lung functions, without different influences of the cyclists and football players on the lung functions.  相似文献   
66.
67.
68.
As millions of people turn to social media for health information, better understanding the factors that guide health-related judgments and perceptions in this context is imperative. We report on two Web experiments (n > 400 total) examining the power of society’s widespread weight bias and related stereotypes to influence nutrition judgments in social media spaces. In Experiment 1, meals were judged as lower in nutritional quality when the person who recommended them (the source) was depicted as obese rather than of normal weight, an effect mediated by stereotypic beliefs about the source as a generally unhealthy person. Experiment 2 replicated this effect, which—notably—remained significant when controlling for objective nutritional information (calories and fat content). Results highlight spillover effects of weight bias that extend beyond person perception to color impressions of objects (here, food) that are associated with stigmatized attributes. Implications for everyday nutrition judgments and public health are considered.  相似文献   
69.
70.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号