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   23609篇
  免费   1719篇
  国内免费   55篇
耳鼻咽喉   324篇
儿科学   444篇
妇产科学   509篇
基础医学   3057篇
口腔科学   375篇
临床医学   2807篇
内科学   4698篇
皮肤病学   338篇
神经病学   2029篇
特种医学   897篇
外科学   4181篇
综合类   185篇
一般理论   50篇
预防医学   1737篇
眼科学   587篇
药学   1557篇
中国医学   21篇
肿瘤学   1587篇
  2024年   27篇
  2023年   254篇
  2022年   425篇
  2021年   1017篇
  2020年   509篇
  2019年   870篇
  2018年   942篇
  2017年   681篇
  2016年   726篇
  2015年   821篇
  2014年   1222篇
  2013年   1363篇
  2012年   2237篇
  2011年   2259篇
  2010年   1165篇
  2009年   1074篇
  2008年   1639篇
  2007年   1608篇
  2006年   1439篇
  2005年   1340篇
  2004年   1137篇
  2003年   1003篇
  2002年   830篇
  2001年   114篇
  2000年   76篇
  1999年   67篇
  1998年   106篇
  1997年   74篇
  1996年   43篇
  1995年   27篇
  1994年   32篇
  1993年   24篇
  1992年   17篇
  1991年   15篇
  1990年   12篇
  1989年   20篇
  1988年   17篇
  1987年   16篇
  1986年   13篇
  1985年   16篇
  1984年   11篇
  1983年   14篇
  1982年   9篇
  1981年   7篇
  1980年   10篇
  1979年   9篇
  1978年   6篇
  1974年   4篇
  1968年   3篇
  1966年   4篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
We present a comprehensive, meta‐analytic review and critical evaluation of outcome research pertaining to the effectiveness of premarital prevention programs. Results revealed that the mean effect size for premarital programs was .80, which means that the average person who participated in a premarital prevention program was significantly better off afterwards than 79% of people who did not participate. Stated differently, the average participant in a premarital program tends to experience about a 30% increase in measures of outcome success. Our findings suggest that premarital prevention programs are generally effective in producing immediate and short‐term gains in interpersonal skills and overall relationship quality and that these improvements are significantly better than nonintervention couples in these areas. However, because of a lack of extended follow‐up research, conclusions about long‐term effectiveness remain elusive. We propose implications for future research, education, and policy.  相似文献   
62.
Competitive pressures to achieve a slim body shape may be of importance in the etiology of eating disorders in ballet dancers. This study examines the presence of anorexia nervosa-like symptoms in a group of 49 female ballet students (mean age = 18.9 years, SD ± 1.9). All students were assessed for certain physical (weight and height) and psychological (Eating Attitude Test [EAT]) indices at the start of their academic training year. Thereafter, all subjects who presented with anorexia nervosa-like symptoms (EAT ≥ 30, and/or with current secondary amenorrhea or primary amenorrhea if aged 16 years or over) at the initial assessment, were invited for a semistructured interview (Morgan-Russel scales) to determine their diagnostic status. Another aim of the study was to assess the prognostic implications of a diagnosis of anorexia nervosa in this sample. All subjects previously interviewed were invited for a follow-up assessment at 10 months. Anorexia nervosa could be diagnosed in 2 students (4.1%), whilst another 4 students (8.2%) presented with “partial syndrome” anorexia nervosa. All diagnosed students managed to complete their academic training year. The development and implications of a diagnosis of anorexia nervosa in the ballet students are discussed.  相似文献   
63.
64.
65.
66.
Copper radionuclides and radiopharmaceuticals in nuclear medicine   总被引:4,自引:0,他引:4  
The chemistry, radiochemistry, radiobiology, and radiopharmacology of radiopharmaceuticals containing copper radionuclides are reviewed. Copper radionuclides offer application in positron emission tomography, targeted radiotherapy, and single photon imaging. The chemistry of copper is relatively simple and well-suited to radiopharmaceutical application. Current radiopharmaceuticals include biomolecules labelled via bifunctional chelators primarily based on cyclic polyaminocarboxylates and polyamines, and pyruvaldehyde-bis(N4-methylthiosemicarbazone) (PTSM) and its analogues. The chemistry of copper, of which only a fraction has yet been exploited, is likely to be applied more fully in the future.  相似文献   
67.
68.
69.
70.
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