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   1383884篇
  免费   107282篇
  国内免费   4357篇
耳鼻咽喉   17192篇
儿科学   45117篇
妇产科学   37501篇
基础医学   204992篇
口腔科学   37153篇
临床医学   135940篇
内科学   267872篇
皮肤病学   27412篇
神经病学   116222篇
特种医学   50012篇
外国民族医学   366篇
外科学   190094篇
综合类   29810篇
现状与发展   1篇
一般理论   501篇
预防医学   120326篇
眼科学   29943篇
药学   102681篇
  6篇
中国医学   3254篇
肿瘤学   79128篇
  2021年   12162篇
  2019年   12785篇
  2018年   17578篇
  2017年   13232篇
  2016年   14314篇
  2015年   16353篇
  2014年   22255篇
  2013年   34063篇
  2012年   47141篇
  2011年   49824篇
  2010年   28671篇
  2009年   26413篇
  2008年   45148篇
  2007年   47599篇
  2006年   47523篇
  2005年   45850篇
  2004年   43675篇
  2003年   41472篇
  2002年   40144篇
  2001年   62015篇
  2000年   63612篇
  1999年   53425篇
  1998年   15179篇
  1997年   13725篇
  1996年   13549篇
  1995年   12899篇
  1994年   11997篇
  1993年   11330篇
  1992年   42487篇
  1991年   41630篇
  1990年   40260篇
  1989年   38086篇
  1988年   35305篇
  1987年   34452篇
  1986年   32860篇
  1985年   31318篇
  1984年   23644篇
  1983年   20080篇
  1982年   12089篇
  1979年   21237篇
  1978年   15208篇
  1977年   12365篇
  1976年   12196篇
  1975年   12380篇
  1974年   15158篇
  1973年   14793篇
  1972年   13662篇
  1971年   12696篇
  1970年   11748篇
  1969年   10703篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
991.
992.
OBJECTIVES: The aim of the study was to check and present data on the relation between combined oral contraceptives (COC) use and body weight in young women living in Poland. METHODS: Observational study on the group of young women on COC and the control group of young women who never used COC. Candidates for study (145 women) and control (218 women) groups were recruited in selected gynecological clinics in Poland during the period of 1-31 January 2002 (with the use of randomization). RESULTS: Both groups (study and control) were almost identical in age, anthropometric characteristics, number of pregnancies and deliveries. On the basis of this investigation it was found that there was no relation between use of COC and weight gain. Observed (in both groups) weight gain in young women was most probably related rather to time-passing (patients were getting older). The higher risk for overweight and obesity was found in the group of young women who had already had problems with overweight in their childhood. and in the group of women with high weight gain during the first pregnancy. CONCLUSION: COC use is not associated with weight gain in young women with a Central European life-style.  相似文献   
993.
PURPOSE: To provide a model for assessing occupational therapy workforce needs by using a demand-based approach to determine current workforce status in the Northwest region. Regional information may have implications for addressing national occupational therapy service needs. METHOD: A questionnaire was sent to a proportional random sample of 234 facilities that hire occupational therapy practitioners. Data were collected in July-August 2003 using structured mailing and follow-up procedures. RESULTS: Response rate was 79%. Twenty-four percent reported occupational therapy vacancies and 11% occupational therapy assistant vacancies; 48% predicted an increase in occupational therapy positions in the next 2 years and 41% an increase in occupational therapy assistant positions. Sixty-three percent of respondents reported difficulty in hiring. DISCUSSION: This study identifies an occupational therapy workforce shortage in the Northwest. Management of a shortage is critical, for even short-term adjustments could lead to permanent changes in service provision. This study demonstrates the importance of current information on the status of the national workforce and serves as a model for future studies.  相似文献   
994.
995.
996.
The literature suggests that pain in the elderly, especially among seniors with dementia, is under-assessed and under-treated.This qualitative study solicited the perspectives of seniors, front-line nursing staff, nursing-home administrators, and informal caregivers of seniors with dementia on the current status of pain assessment and management. The views of these participants complement the research findings reported in the literature. While some of their explanations and potential solutions concerning under-treatment of pain in seniors echo views that have been presented in the literature, the participants also pointed to factors and avenues that have been given less formal consideration (e.g., systemic barriers to effective assessment and treatment of pain).They also highlighted the need for pain-control strategies beyond medication. The implications of these findings are discussed.  相似文献   
997.
998.
999.
1000.
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