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   3228558篇
  免费   262496篇
  国内免费   6656篇
耳鼻咽喉   46168篇
儿科学   102428篇
妇产科学   89329篇
基础医学   453318篇
口腔科学   92617篇
临床医学   295134篇
内科学   630068篇
皮肤病学   69164篇
神经病学   272490篇
特种医学   127321篇
外国民族医学   1189篇
外科学   485683篇
综合类   78374篇
现状与发展   4篇
一般理论   1333篇
预防医学   262034篇
眼科学   76684篇
药学   236953篇
  5篇
中国医学   6565篇
肿瘤学   170849篇
  2018年   34724篇
  2017年   26664篇
  2016年   29626篇
  2015年   33503篇
  2014年   48195篇
  2013年   72966篇
  2012年   98444篇
  2011年   104048篇
  2010年   61396篇
  2009年   58730篇
  2008年   97767篇
  2007年   103800篇
  2006年   104776篇
  2005年   101994篇
  2004年   97810篇
  2003年   94079篇
  2002年   92065篇
  2001年   151098篇
  2000年   155809篇
  1999年   131221篇
  1998年   38533篇
  1997年   34912篇
  1996年   34533篇
  1995年   32900篇
  1994年   30636篇
  1993年   28684篇
  1992年   103517篇
  1991年   99648篇
  1990年   95964篇
  1989年   92246篇
  1988年   85510篇
  1987年   84151篇
  1986年   79336篇
  1985年   75781篇
  1984年   57791篇
  1983年   49170篇
  1982年   30108篇
  1981年   26755篇
  1979年   53471篇
  1978年   37709篇
  1977年   31595篇
  1976年   29715篇
  1975年   30969篇
  1974年   38118篇
  1973年   36451篇
  1972年   34212篇
  1971年   31465篇
  1970年   29750篇
  1969年   27683篇
  1968年   25645篇
排序方式: 共有10000条查询结果,搜索用时 36 毫秒
41.
Secondary tricuspid regurgitation (TR) caused by right ventricular enlargement in the setting of left heart disease/pulmonary hypertension has been well described. In contrast, that associated with right atrial enlargement—atrial functional TR (AF‐TR)—remains largely underappreciated. AF‐TR most often occurs in the setting of lone atrial fibrillation, although it is also seen in its absence (idiopathic AF‐TR). Several recent studies have found that the prevalence, hemodynamic significance, and prognosis of AF‐TR are not inconsequential, suggesting increased physician awareness of this novel clinical entity is warranted. This article discusses the pathogenesis, echocardiographic findings, and treatment of this underappreciated cause of secondary TR.  相似文献   
42.
43.
BackgroundThe aim of this study was to estimate the prevalence of dental prosthetic treatment and to investigate the demographic, social, economic and medical factors associated with the use of fixed and removable dentures in a representative sample of adults living in France.MethodsThe data were obtained from the 2002–2003 Decennial Health Survey, a cross-sectional study of a representative sample of the population living in France, which included 29,679 adults. Information was collected by interview. The variables collected were fixed denture, removable denture, age, gender, number of children, area of residence, nationality, educational attainment, family social status, employment status, annual household income per capita, supplementary insurance, chronic disease, eyesight problems/glasses, hearing problems/hearing aids. Multinomial logistic regression models were used to study the relationship between prosthetic treatment and demographic, socioeconomic and medical characteristics unadjusted, adjusted for age and adjusted for all the characteristics.ResultsThe prevalence of prosthetic treatment was 34.6% (95% confidence interval (CI): [34.1; 35.2]) for fixed prosthetic dentures and 13.8% (95% CI: [13.4; 14.2]) for removable prosthetic dentures. We showed a gradient between educational attainment and removable dentures; the odds ratio adjusted for all the variables (aOR) associated with no or primary education compared to post-secondary education was 2.56; 95% CI: [2.09; 3.13]. When annual household income per capita was low, subjects were less likely to report fixed dentures (aOR = 0.68; 95% CI: [0.62; 0.75]) than those with high annual household income per capita. Individuals without insurance less often reported fixed dentures than those with private insurance. Those reporting chronic disease were less likely to report fixed dentures (aOR = 0.87; 95% CI: [0.79; 0.95]) but more likely to report removable dentures (aOR = 1.29; 95% CI: [1.17; 1.43]) than those without chronic disease.ConclusionThis study reveals social, economic and medical inequalities in fixed and removable prosthetic treatment among adults in France.  相似文献   
44.
45.
ABSTRACT

This project examined 55 picture books featuring transgender, gender expansive or genderqueer protagonists or narrators published between 2008 and 2018. The purpose of the study was to determine how this genre of children’s literature supports and challenges four gender assumptions: the gender binary, gender essentialism, sex/gender congruency and gender stability. Additionally, this critical analysis explored misgendering within this genre and themes of social rejection and acceptance. Protagonists and narrators were permitted a degree of gender nonconformity, however, the majority of picture books missed opportunities for a more complete exploration of gender possibilities.  相似文献   
46.
47.
48.
49.
50.
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