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   1534148篇
  免费   122776篇
  国内免费   3704篇
耳鼻咽喉   20161篇
儿科学   50513篇
妇产科学   43728篇
基础医学   217233篇
口腔科学   43773篇
临床医学   135421篇
内科学   312147篇
皮肤病学   36368篇
神经病学   127341篇
特种医学   57811篇
外国民族医学   484篇
外科学   225983篇
综合类   33845篇
现状与发展   4篇
一般理论   536篇
预防医学   123576篇
眼科学   33898篇
药学   106098篇
  1篇
中国医学   3880篇
肿瘤学   87827篇
  2021年   13834篇
  2019年   14373篇
  2018年   20298篇
  2017年   15443篇
  2016年   16799篇
  2015年   19054篇
  2014年   26744篇
  2013年   38691篇
  2012年   53604篇
  2011年   56546篇
  2010年   32527篇
  2009年   30909篇
  2008年   50957篇
  2007年   53851篇
  2006年   53817篇
  2005年   52665篇
  2004年   50174篇
  2003年   47561篇
  2002年   44408篇
  2001年   75990篇
  2000年   77523篇
  1999年   64252篇
  1998年   18078篇
  1997年   16331篇
  1996年   16466篇
  1995年   15536篇
  1994年   14147篇
  1993年   13278篇
  1992年   47534篇
  1991年   45094篇
  1990年   42996篇
  1989年   41039篇
  1988年   37583篇
  1987年   36688篇
  1986年   34135篇
  1985年   32479篇
  1984年   24701篇
  1983年   20738篇
  1982年   12599篇
  1981年   11175篇
  1979年   21352篇
  1978年   15019篇
  1977年   12438篇
  1976年   11662篇
  1975年   12018篇
  1974年   14412篇
  1973年   13934篇
  1972年   12975篇
  1971年   11766篇
  1970年   11258篇
排序方式: 共有10000条查询结果,搜索用时 46 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