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   174791篇
  免费   926篇
耳鼻咽喉   1123篇
儿科学   6627篇
妇产科学   2993篇
基础医学   16421篇
口腔科学   1529篇
临床医学   12308篇
内科学   30636篇
皮肤病学   663篇
神经病学   16363篇
特种医学   8900篇
外科学   28707篇
综合类   2307篇
预防医学   18039篇
眼科学   2728篇
药学   9447篇
中国医学   627篇
肿瘤学   16299篇
  2019年   17篇
  2018年   21922篇
  2017年   17362篇
  2016年   19511篇
  2015年   889篇
  2014年   777篇
  2013年   731篇
  2012年   6900篇
  2011年   20939篇
  2010年   18774篇
  2009年   11473篇
  2008年   19456篇
  2007年   21645篇
  2006年   480篇
  2005年   2106篇
  2004年   3328篇
  2003年   4292篇
  2002年   2446篇
  2001年   255篇
  2000年   400篇
  1999年   154篇
  1998年   194篇
  1997年   195篇
  1996年   85篇
  1995年   96篇
  1994年   95篇
  1993年   57篇
  1992年   37篇
  1991年   87篇
  1990年   129篇
  1989年   79篇
  1988年   57篇
  1987年   41篇
  1986年   32篇
  1985年   32篇
  1984年   22篇
  1983年   26篇
  1982年   26篇
  1980年   41篇
  1974年   25篇
  1970年   24篇
  1969年   23篇
  1968年   20篇
  1939年   20篇
  1938年   60篇
  1937年   25篇
  1935年   23篇
  1934年   30篇
  1932年   56篇
  1930年   46篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
32.
Abstract We report a case of SMV injury in a critically ill patient. The patient was a 19-year-old woman involved in a motor vehicle collision. Her injuries included grade II splenic and renal lacerations, devascularized and lacerated right and transverse colon, a transected transverse mesocolon, a massive shear injury of her abdominal wall, and two partial SMV transections. At initial damage control laparotomy, the SMV was ligated, the devascularized bowel resected and a temporary abdominal closure applied. At re-operation, a mesocaval shunt using saphenous vein was employed. The shunt failed and the patient required a saphenous vein jump graft. Although visceral vascular injuries are rare, ligation of the SMV in a damage control situation is acceptable. This case study is the first to discuss appropriate treatment when interruption to a patient's collateral visceral venous drainage limits the surgeon’s ability to ligate. In these situations, bypass shunts may be successful.  相似文献   
33.
For persons battling HIV/AIDS a stable place to live may decide the length and quality of life itself. It is nearly impossible for a person on the streets to engage in a needed continuous AIDS treatment regimen when the very basic question of where that person will rest his or her head when darkness comes in just a few hours is unresolved. When danger lurks on the streets, when cold numbs the limbs, when tiredness overwhelms the mind, when fear breaks the spirit, a place to call home would make all the difference.  相似文献   
34.
35.

Background  

Reports on childhood cancer survivors estimated cumulative probability of developing secondary neoplasms vary from 3,3% to 25% at 25 years from diagnosis, and the risk of developing another cancer to several times greater than in the general population.  相似文献   
36.
37.

Background  

It is well known that physicians' night-call duty may cause impaired performance and adverse effects on subjective health, but there is limited knowledge about effects on sleep duration and recovery time. In recent years occupational stress and impaired well-being among anaesthesiologists have been frequently reported for in the scientific literature. Given their main focus on handling patients with life-threatening conditions, when on call, one might expect sleep and recovery to be negatively affected by work, especially in this specialist group. The aim of the present study was to examine whether a 16-hour night-call schedule allowed for sufficient recovery in anaesthesiologists compared with other physician specialists handling less life-threatening conditions, when on call.  相似文献   
38.
Associations between street connectivity and active transportation   总被引:1,自引:0,他引:1  

Background  

Past studies of associations between measures of the built environment, particularly street connectivity, and active transportation (AT) or leisure walking/bicycling have largely failed to account for spatial autocorrelation of connectivity variables and have seldom examined both the propensity for AT and its duration in a coherent fashion. Such efforts could improve our understanding of the spatial and behavioral aspects of AT. We analyzed spatially identified data from Los Angeles and San Diego Counties collected as part of the 2001 California Health Interview Survey.  相似文献   
39.

Objective  

To test the effects of the use of a collapsible, portable chair (chair B), as opposed to a ‘standard’ chair (chair A), on the outcome of the timed “Up and Go” (TUG) test.  相似文献   
40.
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