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   1159634篇
  免费   78611篇
  国内免费   2074篇
耳鼻咽喉   16022篇
儿科学   37262篇
妇产科学   30776篇
基础医学   164931篇
口腔科学   31530篇
临床医学   101897篇
内科学   222488篇
皮肤病学   26202篇
神经病学   89450篇
特种医学   46336篇
外国民族医学   223篇
外科学   175359篇
综合类   23238篇
现状与发展   1篇
一般理论   308篇
预防医学   79553篇
眼科学   25927篇
药学   93135篇
  10篇
中国医学   3297篇
肿瘤学   72374篇
  2021年   9143篇
  2019年   9213篇
  2018年   13104篇
  2017年   10283篇
  2016年   11556篇
  2015年   12975篇
  2014年   17519篇
  2013年   25483篇
  2012年   34917篇
  2011年   36829篇
  2010年   21935篇
  2009年   20396篇
  2008年   33952篇
  2007年   36278篇
  2006年   36701篇
  2005年   34854篇
  2004年   33897篇
  2003年   32629篇
  2002年   31634篇
  2001年   63320篇
  2000年   64739篇
  1999年   53580篇
  1998年   13478篇
  1997年   11797篇
  1996年   11742篇
  1995年   11038篇
  1994年   9959篇
  1993年   9462篇
  1992年   39377篇
  1991年   37868篇
  1990年   37108篇
  1989年   35593篇
  1988年   32088篇
  1987年   31084篇
  1986年   29301篇
  1985年   27408篇
  1984年   19891篇
  1983年   16759篇
  1982年   9236篇
  1979年   17561篇
  1978年   11790篇
  1977年   10572篇
  1976年   9157篇
  1975年   10467篇
  1974年   12105篇
  1973年   11703篇
  1972年   11152篇
  1971年   10459篇
  1970年   9585篇
  1969年   9281篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
32.
33.
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   
34.
35.
36.
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   
37.
38.
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   
39.
40.
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