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   1854466篇
  免费   127239篇
  国内免费   3509篇
耳鼻咽喉   26277篇
儿科学   60062篇
妇产科学   51848篇
基础医学   262930篇
口腔科学   51536篇
临床医学   159875篇
内科学   361290篇
皮肤病学   41084篇
神经病学   143746篇
特种医学   74218篇
外国民族医学   535篇
外科学   286023篇
综合类   38489篇
现状与发展   1篇
一般理论   495篇
预防医学   132064篇
眼科学   42395篇
药学   141208篇
  7篇
中国医学   4352篇
肿瘤学   106779篇
  2018年   18988篇
  2017年   14980篇
  2016年   16570篇
  2015年   18580篇
  2014年   25903篇
  2013年   38980篇
  2012年   52661篇
  2011年   55889篇
  2010年   33470篇
  2009年   31546篇
  2008年   52783篇
  2007年   56228篇
  2006年   56972篇
  2005年   54987篇
  2004年   52697篇
  2003年   50867篇
  2002年   49554篇
  2001年   93760篇
  2000年   96334篇
  1999年   81135篇
  1998年   21129篇
  1997年   18923篇
  1996年   18930篇
  1995年   17612篇
  1994年   16417篇
  1993年   15494篇
  1992年   61654篇
  1991年   59166篇
  1990年   58069篇
  1989年   55890篇
  1988年   51102篇
  1987年   49921篇
  1986年   47372篇
  1985年   44903篇
  1984年   32909篇
  1983年   27810篇
  1982年   15949篇
  1981年   13923篇
  1979年   29908篇
  1978年   20380篇
  1977年   17900篇
  1976年   16089篇
  1975年   18054篇
  1974年   21285篇
  1973年   20457篇
  1972年   19510篇
  1971年   18153篇
  1970年   17066篇
  1969年   16307篇
  1968年   14969篇
排序方式: 共有10000条查询结果,搜索用时 640 毫秒
61.
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   
62.
63.
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