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   180235篇
  免费   1316篇
  国内免费   25篇
耳鼻咽喉   1180篇
儿科学   6712篇
妇产科学   3083篇
基础医学   16923篇
口腔科学   1639篇
临床医学   12907篇
内科学   31754篇
皮肤病学   691篇
神经病学   16808篇
特种医学   9360篇
外科学   29583篇
综合类   2408篇
一般理论   2篇
预防医学   18693篇
眼科学   2800篇
药学   9702篇
  1篇
中国医学   626篇
肿瘤学   16704篇
  2022年   48篇
  2021年   100篇
  2020年   59篇
  2019年   98篇
  2018年   22026篇
  2017年   17422篇
  2016年   19575篇
  2015年   979篇
  2014年   898篇
  2013年   917篇
  2012年   7225篇
  2011年   21229篇
  2010年   18907篇
  2009年   11609篇
  2008年   19665篇
  2007年   21895篇
  2006年   724篇
  2005年   2342篇
  2004年   3558篇
  2003年   4465篇
  2002年   2611篇
  2001年   430篇
  2000年   587篇
  1999年   310篇
  1998年   243篇
  1997年   230篇
  1996年   129篇
  1995年   137篇
  1994年   136篇
  1993年   100篇
  1992年   186篇
  1991年   213篇
  1990年   278篇
  1989年   220篇
  1988年   188篇
  1987年   172篇
  1986年   147篇
  1985年   126篇
  1984年   105篇
  1983年   90篇
  1982年   64篇
  1980年   75篇
  1979年   55篇
  1978年   65篇
  1974年   72篇
  1970年   57篇
  1969年   58篇
  1968年   52篇
  1938年   60篇
  1932年   56篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
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   
72.

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   
73.

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   
74.
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   
75.
Hypoxia is related to poor prognosis because it is associated to chemo-and radioresistance. During recent years the evolution of imaging methods like PET/CT and MRI has meant the appearance of new perspectives with direct implications in radiation therapy. We discuss previous experiences in staging, planning and in the follow-up process with these techniques for measuring tumour hypoxia.  相似文献   
76.

Background  

Bortezomib, a proteasome-specific inhibitor, has emerged as a promising cancer therapeutic agent. However, development of resistance to bortezomib may pose a challenge to effective anticancer therapy. Therefore, characterization of cellular mechanisms involved in bortezomib resistance and development of effective strategies to overcome this resistance represent important steps in the advancement of bortezomib-mediated cancer therapy.  相似文献   
77.

Background  

The fibromyalgia syndrome (FMS) is suggested to be a manifestation of depression or affective spectrum disorder. We measured the cognitive style of patients with FMS to assess personality styles in 44 patients with fibromyalgia syndrome (FMS) by comparing them with 43 patients with major depressive disorder (MDD) and 41 healthy controls (HC).  相似文献   
78.
79.
80.
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