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   1350902篇
  免费   91407篇
  国内免费   2811篇
耳鼻咽喉   18680篇
儿科学   43517篇
妇产科学   38024篇
基础医学   201290篇
口腔科学   37849篇
临床医学   114627篇
内科学   263355篇
皮肤病学   29568篇
神经病学   103137篇
特种医学   52560篇
外国民族医学   392篇
外科学   209252篇
综合类   26659篇
一般理论   366篇
预防医学   99700篇
眼科学   30994篇
药学   99603篇
中国医学   2657篇
肿瘤学   72890篇
  2018年   13227篇
  2016年   11181篇
  2015年   12508篇
  2014年   17585篇
  2013年   27442篇
  2012年   36693篇
  2011年   39587篇
  2010年   23681篇
  2009年   22417篇
  2008年   37947篇
  2007年   40520篇
  2006年   40896篇
  2005年   39901篇
  2004年   38486篇
  2003年   37106篇
  2002年   36654篇
  2001年   61800篇
  2000年   63848篇
  1999年   53746篇
  1998年   14706篇
  1997年   13244篇
  1996年   13449篇
  1995年   12460篇
  1994年   11867篇
  1993年   11193篇
  1992年   41840篇
  1991年   41189篇
  1990年   40796篇
  1989年   39329篇
  1988年   36431篇
  1987年   35936篇
  1986年   34306篇
  1985年   32730篇
  1984年   24384篇
  1983年   20802篇
  1982年   12115篇
  1981年   10839篇
  1979年   22987篇
  1978年   16328篇
  1977年   13829篇
  1976年   13190篇
  1975年   14761篇
  1974年   17594篇
  1973年   16684篇
  1972年   16021篇
  1971年   15025篇
  1970年   14244篇
  1969年   13481篇
  1968年   12795篇
  1967年   11651篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
1.
2.
Sinus venosus atrial septal defect (SV‐ASD) usually coexists with partial anomalous pulmonary vein connection (PAPVC). It is a difficult diagnosis in transthoracic echocardiography (TTE) due to eccentric position of defects. We present a rare case of atypical anatomical variation in PAPVC, which was never described before. Two right pulmonary veins drained into superior vena cava, which overrode SV‐ASD and interatrial septum, a third pulmonary vein into the right atrium. Complete diagnosis could not be set after TTE, nor transesophageal echocardiography, whereas angio‐CT was finally conclusive. This diagnostic approach allowed the surgical planning.  相似文献   
3.
4.
5.
6.
7.
8.
9.
10.
Past research suggests that as many as 50% of onward human immunodeficiency virus (HIV) transmissions occur during acute and recent HIV infection. It is clearly important to develop interventions which focus on this highly infectious stage of HIV infection to prevent further transmission in the risk networks of acutely and recently infected individuals. Project Protect tries to find recently and acutely infected individuals and prevents HIV transmission in their risk networks. Participants are recruited by community health outreach workers at community-based HIV testing sites and drug users' community venues, by coupon referrals and through referrals from AIDS clinics. When a network with acute/recent infection is identified, network members are interviewed about their risky behaviors, network information is collected, and blood is drawn for HIV testing. Participants are also educated and given prevention materials (condoms, syringes, educational materials); HIV-infected participants are referred to AIDS clinics and are assisted with access to care. Community alerts about elevated risk of HIV transmission are distributed within the risk networks of recently infected. Overall, 342 people were recruited to the project and screened for acute/recent HIV infection. Only six index cases of recent infection (2.3% of all people screened) were found through primary screening at voluntary counseling and testing (VCT) sites, but six cases of recent infection were found through contact tracing of these recently infected participants (7% of network members who came to the interview). Combining screening at VCT sites and contact tracing the number of recently infected people we located as compared to VCT screening alone. No adverse events were encountered. These first results provide evidence for the theory behind the intervention, i.e., in the risk networks of recently infected people there are other people with recent HIV infection and they can be successfully located without increasing stigma for project participants.  相似文献   
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