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   215336篇
  免费   5097篇
  国内免费   2824篇
耳鼻咽喉   1440篇
儿科学   7165篇
妇产科学   3463篇
基础医学   20678篇
口腔科学   2341篇
临床医学   17634篇
内科学   36524篇
皮肤病学   1033篇
神经病学   17882篇
特种医学   10301篇
外国民族医学   16篇
外科学   32838篇
综合类   9831篇
现状与发展   7篇
一般理论   6篇
预防医学   21176篇
眼科学   3864篇
药学   14057篇
  31篇
中国医学   3399篇
肿瘤学   19571篇
  2024年   209篇
  2023年   771篇
  2022年   1977篇
  2021年   2433篇
  2020年   1880篇
  2019年   1484篇
  2018年   23336篇
  2017年   18770篇
  2016年   20776篇
  2015年   2928篇
  2014年   3309篇
  2013年   3106篇
  2012年   10218篇
  2011年   24309篇
  2010年   21063篇
  2009年   13357篇
  2008年   21703篇
  2007年   23778篇
  2006年   2467篇
  2005年   3772篇
  2004年   4582篇
  2003年   5377篇
  2002年   3389篇
  2001年   1050篇
  2000年   1140篇
  1999年   892篇
  1998年   671篇
  1997年   657篇
  1996年   489篇
  1995年   468篇
  1994年   422篇
  1993年   244篇
  1992年   281篇
  1991年   264篇
  1990年   256篇
  1989年   196篇
  1988年   188篇
  1987年   160篇
  1986年   131篇
  1985年   101篇
  1984年   47篇
  1983年   45篇
  1982年   42篇
  1980年   46篇
  1938年   60篇
  1937年   25篇
  1935年   22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 0 毫秒
41.
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   
42.
43.

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   
44.
45.

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   
46.
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   
47.

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   
48.
49.

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   
50.

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   
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