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   1447274篇
  免费   119498篇
  国内免费   6118篇
耳鼻咽喉   18642篇
儿科学   47034篇
妇产科学   41356篇
基础医学   204014篇
口腔科学   38371篇
临床医学   131268篇
内科学   288817篇
皮肤病学   33797篇
神经病学   118206篇
特种医学   55300篇
外国民族医学   466篇
外科学   213668篇
综合类   42617篇
现状与发展   19篇
一般理论   487篇
预防医学   113666篇
眼科学   32337篇
药学   102833篇
  52篇
中国医学   6364篇
肿瘤学   83576篇
  2021年   12554篇
  2019年   12676篇
  2018年   17612篇
  2017年   13800篇
  2016年   15266篇
  2015年   17563篇
  2014年   24570篇
  2013年   35573篇
  2012年   48581篇
  2011年   51422篇
  2010年   31014篇
  2009年   29468篇
  2008年   46849篇
  2007年   49380篇
  2006年   49755篇
  2005年   47807篇
  2004年   45507篇
  2003年   43419篇
  2002年   41734篇
  2001年   74158篇
  2000年   75321篇
  1999年   62053篇
  1998年   17278篇
  1997年   15749篇
  1996年   15815篇
  1995年   14983篇
  1994年   13547篇
  1993年   12662篇
  1992年   45915篇
  1991年   43543篇
  1990年   41526篇
  1989年   39596篇
  1988年   36211篇
  1987年   35370篇
  1986年   32872篇
  1985年   31280篇
  1984年   23826篇
  1983年   20023篇
  1982年   12207篇
  1981年   10780篇
  1979年   20700篇
  1978年   14576篇
  1977年   12084篇
  1976年   11364篇
  1975年   11619篇
  1974年   13988篇
  1973年   13533篇
  1972年   12633篇
  1971年   11469篇
  1970年   10910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.
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   
28.
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