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   188312篇
  免费   1962篇
  国内免费   60篇
耳鼻咽喉   1273篇
儿科学   6872篇
妇产科学   3187篇
基础医学   18242篇
口腔科学   1945篇
临床医学   13634篇
内科学   33786篇
皮肤病学   853篇
神经病学   17559篇
特种医学   9343篇
外科学   30723篇
综合类   2453篇
一般理论   13篇
预防医学   19335篇
眼科学   2970篇
药学   10329篇
中国医学   635篇
肿瘤学   17182篇
  2023年   123篇
  2022年   258篇
  2021年   480篇
  2020年   225篇
  2019年   402篇
  2018年   22283篇
  2017年   17605篇
  2016年   19774篇
  2015年   1245篇
  2014年   1272篇
  2013年   1389篇
  2012年   7888篇
  2011年   21901篇
  2010年   19298篇
  2009年   11969篇
  2008年   20229篇
  2007年   22473篇
  2006年   1336篇
  2005年   3016篇
  2004年   4155篇
  2003年   4983篇
  2002年   3073篇
  2001年   422篇
  2000年   530篇
  1999年   307篇
  1998年   355篇
  1997年   324篇
  1996年   191篇
  1995年   202篇
  1994年   172篇
  1993年   129篇
  1992年   126篇
  1991年   170篇
  1990年   184篇
  1989年   144篇
  1988年   124篇
  1987年   118篇
  1986年   115篇
  1985年   94篇
  1984年   86篇
  1983年   81篇
  1982年   90篇
  1980年   78篇
  1979年   44篇
  1974年   38篇
  1970年   44篇
  1969年   45篇
  1938年   61篇
  1932年   57篇
  1930年   48篇
排序方式: 共有10000条查询结果,搜索用时 9 毫秒
61.

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   
62.
63.

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   
64.
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   
65.

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   
66.
67.

Background  

Exercise has been recommended for improving global-well being in adults with fibromyalgia. However, no meta-analysis has determined the effects of exercise on global well-being using a single instrument and when analyzed separately according to intention-to-treat and per-protocol analyses. The purpose of this study was to fill that gap.  相似文献   
68.

Background  

Due to marginalization, trafficking violence, conflicts with the police and organic and social psychological problems associated with the drug, crack is one of the most devastating drugs currently in use. However, there is evidence that some users manage to stay alive and active while using crack cocaine for many years, despite the numerous adversities and risks involved with this behavior. In this context, the aim of the present study was to identify the strategies and tactics developed by crack users to deal with the risks associated with the culture of use by examining the survival strategies employed by long-term users.  相似文献   
69.

Background  

Malaria, caused by the parasite Plasmodium falciparum, is a significant source of morbidity and mortality in southern Zambia. In the Mapanza Chiefdom, where transmission is seasonal, Anopheles arabiensis is the dominant malaria vector. The ability to predict larval habitats can help focus control measures.  相似文献   
70.

Background  

Climate change is taking a toll on human health, and some leaders in the public health community have urged their colleagues to give voice to its health implications. Previous research has shown that Americans are only dimly aware of the health implications of climate change, yet the literature on issue framing suggests that providing a novel frame - such as human health - may be potentially useful in enhancing public engagement. We conducted an exploratory study in the United States of people's reactions to a public health-framed short essay on climate change.  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