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   180541篇
  免费   1384篇
  国内免费   18篇
耳鼻咽喉   1245篇
儿科学   6958篇
妇产科学   3148篇
基础医学   17320篇
口腔科学   1570篇
临床医学   12715篇
内科学   31884篇
皮肤病学   844篇
神经病学   16602篇
特种医学   8960篇
外科学   29255篇
综合类   2607篇
一般理论   1篇
预防医学   18454篇
眼科学   2887篇
药学   9961篇
中国医学   659篇
肿瘤学   16873篇
  2022年   98篇
  2021年   176篇
  2020年   104篇
  2019年   128篇
  2018年   22027篇
  2017年   17444篇
  2016年   19631篇
  2015年   1056篇
  2014年   988篇
  2013年   996篇
  2012年   7278篇
  2011年   21301篇
  2010年   18993篇
  2009年   11672篇
  2008年   19730篇
  2007年   21896篇
  2006年   716篇
  2005年   2335篇
  2004年   3516篇
  2003年   4480篇
  2002年   2607篇
  2001年   439篇
  2000年   568篇
  1999年   278篇
  1998年   247篇
  1997年   243篇
  1996年   131篇
  1995年   142篇
  1994年   141篇
  1993年   102篇
  1992年   137篇
  1991年   174篇
  1990年   211篇
  1989年   143篇
  1988年   127篇
  1987年   112篇
  1986年   86篇
  1985年   96篇
  1984年   58篇
  1983年   63篇
  1980年   66篇
  1979年   56篇
  1978年   49篇
  1974年   64篇
  1972年   52篇
  1970年   56篇
  1969年   49篇
  1938年   61篇
  1932年   57篇
  1930年   52篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
61.

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   
62.
63.

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   
64.

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   
65.

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   
66.

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   
67.
Research on physical activity (PA) by level of acculturation in Hispanic children is limited and findings have been mixed. We examined PA participation by primary language used with parents in a representative sample of 4th, 8th, and 11th grade Texas public school students. Mixed-effects regression models were conducted using cross-sectional data from the 2004–2005 School Physical Activity and Nutrition Study (n = 22,049). Self-reported PA was compared among three language-ethnic groups: Spanish-Hispanic (SH) (referent); English-Hispanic (EH); and English-Other (EO). EH and/or EO girls were generally between 1.25 and 2.58 [OR] times more likely to participate in PA across grade levels, with the largest differences found for school sports in 8th grade girls. EH and EO 8th grade boys were 1.71 (CI: 1.40, 2.10) and 2.06 (CI: 1.68, 2.51) times, respectively, more likely to participate in school sports. Findings indicate important disparities in Spanish-speaking Hispanic children’s PA participation.  相似文献   
68.

Introduction  

Planning human resources for health (HRH) is a complex process for policy-makers and, as a result, many countries worldwide swing from surplus to shortage. In-depth case studies can help appraising the challenges encountered and the solutions implemented. This paper has two objectives: to identify the key challenges in HRH planning in Belgium and to formulate recommendations for an effective HRH planning, on the basis of the Belgian case study and lessons drawn from an international benchmarking.  相似文献   
69.

Objective  

The aim of the project was to assess the effectiveness and safety of weekly epoetin-beta (EB) in patients with gastrointestinal cancer (GIC) subjected to concomitant chemoradiotherapy (CCTRT).  相似文献   
70.
Extravasation of chemotherapy is a feared complication of anticancer therapy. The accidental leakage of cytostatic agents into the perivascular tissues may have devastating short-term and long-term consequences for patients. In recent years, the increased focus on chemotherapy extravasation has led to the development of international guidelines that have proven useful tools in daily clinical practice. Moreover, the tissue destruction in one of the most dreaded types of extravasation (ie, anthracycline extravasation) now can effectively be prevented with a specific antidote, dexrazoxane.  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