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   1623378篇
  免费   118959篇
  国内免费   3444篇
耳鼻咽喉   20055篇
儿科学   54051篇
妇产科学   44768篇
基础医学   224918篇
口腔科学   39729篇
临床医学   141582篇
内科学   322954篇
皮肤病学   34515篇
神经病学   136617篇
特种医学   63933篇
外国民族医学   464篇
外科学   246487篇
综合类   35806篇
现状与发展   3篇
一般理论   515篇
预防医学   130227篇
眼科学   34741篇
药学   110974篇
  1篇
中国医学   4009篇
肿瘤学   99432篇
  2021年   11727篇
  2019年   12457篇
  2018年   39533篇
  2017年   30877篇
  2016年   35344篇
  2015年   17697篇
  2014年   24387篇
  2013年   35527篇
  2012年   54190篇
  2011年   71195篇
  2010年   47906篇
  2009年   39855篇
  2008年   66465篇
  2007年   72372篇
  2006年   49550篇
  2005年   50276篇
  2004年   49614篇
  2003年   49000篇
  2002年   45261篇
  2001年   73711篇
  2000年   75498篇
  1999年   62140篇
  1998年   17568篇
  1997年   16024篇
  1996年   15974篇
  1995年   15180篇
  1994年   13803篇
  1993年   12920篇
  1992年   46204篇
  1991年   43845篇
  1990年   41842篇
  1989年   39839篇
  1988年   36453篇
  1987年   35656篇
  1986年   33118篇
  1985年   31558篇
  1984年   24111篇
  1983年   20306篇
  1982年   12513篇
  1981年   10982篇
  1979年   20927篇
  1978年   14809篇
  1977年   12222篇
  1976年   11556篇
  1975年   11745篇
  1974年   14129篇
  1973年   13637篇
  1972年   12712篇
  1971年   11532篇
  1970年   11004篇
排序方式: 共有10000条查询结果,搜索用时 218 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