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   1602390篇
  免费   120268篇
  国内免费   3823篇
耳鼻咽喉   21262篇
儿科学   53675篇
妇产科学   46881篇
基础医学   225468篇
口腔科学   44780篇
临床医学   140981篇
内科学   319110篇
皮肤病学   38143篇
神经病学   129025篇
特种医学   63942篇
外国民族医学   543篇
外科学   239078篇
综合类   33871篇
现状与发展   3篇
一般理论   496篇
预防医学   126885篇
眼科学   36046篇
药学   112101篇
  3篇
中国医学   3638篇
肿瘤学   90550篇
  2021年   12068篇
  2019年   12633篇
  2018年   20830篇
  2017年   16862篇
  2016年   17757篇
  2015年   20859篇
  2014年   27203篇
  2013年   37596篇
  2012年   55809篇
  2011年   54067篇
  2010年   31172篇
  2009年   31197篇
  2008年   47536篇
  2007年   50580篇
  2006年   51219篇
  2005年   57013篇
  2004年   56274篇
  2003年   49966篇
  2002年   43987篇
  2001年   76595篇
  2000年   76234篇
  1999年   66218篇
  1998年   17528篇
  1997年   15736篇
  1996年   15929篇
  1995年   15143篇
  1994年   13716篇
  1993年   12841篇
  1992年   51494篇
  1991年   49436篇
  1990年   47738篇
  1989年   45490篇
  1988年   41747篇
  1987年   40814篇
  1986年   38082篇
  1985年   35933篇
  1984年   27070篇
  1983年   22639篇
  1982年   13105篇
  1979年   24203篇
  1978年   16778篇
  1977年   13722篇
  1976年   12806篇
  1975年   13937篇
  1974年   16911篇
  1973年   16098篇
  1972年   15233篇
  1971年   14042篇
  1970年   13308篇
  1969年   12402篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
22.
23.
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   
24.
25.
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   
26.
27.
28.
29.
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   
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