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   1494577篇
  免费   121860篇
  国内免费   3491篇
耳鼻咽喉   19122篇
儿科学   48982篇
妇产科学   42845篇
基础医学   213890篇
口腔科学   40180篇
临床医学   133592篇
内科学   301404篇
皮肤病学   34613篇
神经病学   125288篇
特种医学   57305篇
外国民族医学   473篇
外科学   221048篇
综合类   33122篇
现状与发展   4篇
一般理论   565篇
预防医学   120473篇
眼科学   32990篇
药学   103836篇
  1篇
中国医学   3541篇
肿瘤学   86654篇
  2021年   12226篇
  2019年   13051篇
  2018年   18305篇
  2017年   14132篇
  2016年   15883篇
  2015年   17819篇
  2014年   25055篇
  2013年   36625篇
  2012年   50545篇
  2011年   53098篇
  2010年   30877篇
  2009年   29847篇
  2008年   48932篇
  2007年   51534篇
  2006年   51902篇
  2005年   50141篇
  2004年   47406篇
  2003年   45139篇
  2002年   43319篇
  2001年   75696篇
  2000年   77240篇
  1999年   63998篇
  1998年   18101篇
  1997年   16339篇
  1996年   16490篇
  1995年   15535篇
  1994年   14117篇
  1993年   13204篇
  1992年   47551篇
  1991年   45046篇
  1990年   42993篇
  1989年   40999篇
  1988年   37516篇
  1987年   36505篇
  1986年   33948篇
  1985年   32332篇
  1984年   24609篇
  1983年   20703篇
  1982年   12589篇
  1981年   11116篇
  1979年   21336篇
  1978年   14959篇
  1977年   12398篇
  1976年   11622篇
  1975年   11888篇
  1974年   14322篇
  1973年   13873篇
  1972年   12920篇
  1971年   11760篇
  1970年   11136篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
21.
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   
22.
23.
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   
24.
25.
26.
27.
28.
There is a sharp difference in how one views TCR structure–function–behaviour dependent on whether its recognition of major histocompatibility complex‐encoded restriction elements (R) is germline selected or somatically generated. The generally accepted or Standard model is built on the assumption that recognition of R is by the V regions of the αβ TCR, which is not driven by allele specificity, whereas the competing model posits that recognition of R is allele‐specific. The establishing of allele‐specific recognition of R by the TCR would rule out the Standard model and clear the road to a consideration of a competing construct, the Tritope model. Here, the case for allele‐specific recognition (germline selected) is detailed making it obvious that the Standard model is untenable.  相似文献   
29.
30.
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