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   2169960篇
  免费   152580篇
  国内免费   4404篇
耳鼻咽喉   32084篇
儿科学   68394篇
妇产科学   60939篇
基础医学   306775篇
口腔科学   63337篇
临床医学   189970篇
内科学   415447篇
皮肤病学   49644篇
神经病学   170044篇
特种医学   85648篇
外国民族医学   595篇
外科学   330719篇
综合类   48910篇
现状与发展   7篇
一般理论   690篇
预防医学   154190篇
眼科学   52215篇
药学   167902篇
  10篇
中国医学   5374篇
肿瘤学   124050篇
  2018年   21577篇
  2016年   19408篇
  2015年   21869篇
  2014年   30124篇
  2013年   44637篇
  2012年   59795篇
  2011年   63284篇
  2010年   37445篇
  2009年   35561篇
  2008年   59109篇
  2007年   63776篇
  2006年   64415篇
  2005年   61810篇
  2004年   59606篇
  2003年   57368篇
  2002年   55935篇
  2001年   104839篇
  2000年   107610篇
  1999年   90553篇
  1998年   24242篇
  1997年   21779篇
  1996年   21257篇
  1995年   19971篇
  1994年   18524篇
  1993年   17410篇
  1992年   69624篇
  1991年   67239篇
  1990年   66082篇
  1989年   64137篇
  1988年   59161篇
  1987年   57988篇
  1986年   55291篇
  1985年   52404篇
  1984年   38979篇
  1983年   33109篇
  1982年   19344篇
  1981年   17434篇
  1979年   36754篇
  1978年   25818篇
  1977年   22658篇
  1976年   20347篇
  1975年   23094篇
  1974年   27268篇
  1973年   26586篇
  1972年   25313篇
  1971年   23698篇
  1970年   22212篇
  1969年   21367篇
  1968年   19702篇
  1967年   17659篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
52.
ABSTRACT

Purpose

Work-related eye injuries have been reported with a variety of epidemiologic and clinical characteristics. We aimed to identify epidemiologic characteristics of work-related eye injuries and risk factors associated with severe injury in a large metropolitan city.  相似文献   
53.
54.
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   
55.
56.
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   
57.
58.
59.
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   
60.
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