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   214808篇
  免费   3115篇
  国内免费   158篇
耳鼻咽喉   1699篇
儿科学   8857篇
妇产科学   3653篇
基础医学   21252篇
口腔科学   2620篇
临床医学   15271篇
内科学   37888篇
皮肤病学   1823篇
神经病学   18888篇
特种医学   10071篇
外科学   34546篇
综合类   3596篇
一般理论   17篇
预防医学   20181篇
眼科学   4421篇
药学   13404篇
  2篇
中国医学   980篇
肿瘤学   18912篇
  2023年   348篇
  2022年   1023篇
  2021年   1706篇
  2020年   950篇
  2019年   1065篇
  2018年   23041篇
  2017年   18130篇
  2016年   20626篇
  2015年   2259篇
  2014年   2827篇
  2013年   3102篇
  2012年   10092篇
  2011年   23883篇
  2010年   20500篇
  2009年   12842篇
  2008年   21435篇
  2007年   23668篇
  2006年   2548篇
  2005年   3884篇
  2004年   4970篇
  2003年   5696篇
  2002年   3653篇
  2001年   1047篇
  2000年   1126篇
  1999年   761篇
  1998年   466篇
  1997年   422篇
  1996年   312篇
  1995年   293篇
  1994年   257篇
  1993年   199篇
  1992年   412篇
  1991年   431篇
  1990年   492篇
  1989年   420篇
  1988年   353篇
  1987年   291篇
  1986年   271篇
  1985年   271篇
  1984年   210篇
  1983年   155篇
  1982年   101篇
  1981年   80篇
  1980年   118篇
  1979年   113篇
  1978年   81篇
  1977年   93篇
  1976年   77篇
  1974年   74篇
  1970年   68篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
91.
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   
92.

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   
93.

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   
94.
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   
95.
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   
96.

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   
97.

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   
98.
99.
100.
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