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   52921篇
  免费   8187篇
  国内免费   170篇
耳鼻咽喉   813篇
儿科学   1613篇
妇产科学   1588篇
基础医学   4660篇
口腔科学   3049篇
临床医学   8848篇
内科学   10693篇
皮肤病学   1055篇
神经病学   4905篇
特种医学   1984篇
外科学   7395篇
综合类   879篇
现状与发展   12篇
一般理论   39篇
预防医学   5793篇
眼科学   860篇
药学   2282篇
  2篇
中国医学   28篇
肿瘤学   4780篇
  2023年   1230篇
  2022年   576篇
  2021年   1133篇
  2020年   1547篇
  2019年   1007篇
  2018年   1928篇
  2017年   1766篇
  2016年   1950篇
  2015年   2065篇
  2014年   2689篇
  2013年   3568篇
  2012年   2431篇
  2011年   2480篇
  2010年   2307篇
  2009年   2854篇
  2008年   2382篇
  2007年   2167篇
  2006年   2397篇
  2005年   2097篇
  2004年   2029篇
  2003年   1904篇
  2002年   1663篇
  2001年   1215篇
  2000年   1088篇
  1999年   1133篇
  1998年   870篇
  1997年   788篇
  1996年   819篇
  1995年   666篇
  1994年   546篇
  1993年   503篇
  1992年   735篇
  1991年   668篇
  1990年   624篇
  1989年   574篇
  1988年   533篇
  1987年   578篇
  1986年   535篇
  1985年   518篇
  1984年   428篇
  1983年   406篇
  1982年   296篇
  1981年   289篇
  1980年   245篇
  1979年   311篇
  1978年   272篇
  1977年   216篇
  1974年   218篇
  1973年   213篇
  1972年   191篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
62.
OBJECTIVE: The purpose of this study was to investigate the effects of therapy balls as seating on in-seat behavior and legible word productivity of students with attention deficit hyperactivity disorder (ADHD). Additionally, social validity was assessed to evaluate teacher and student opinions regarding the intervention. METHOD: A single subject, A-B-A-B interrupted time series design was employed across 3 students (2 males, 1 female) with ADHD. The study was conducted in a 4th grade inclusive classroom during daily language arts. During phases 1 and 3, the 3 participants and all other class members sat on chairs (in-seat on chair); during phases 2 and 4, everyone sat on therapy balls (in-seat on ball). Dependent variables were in-seat behavior and legible word productivity. Data were graphed and visually analyzed for differences between phases. RESULTS: Results demonstrated increases in in-seat behavior and legible word productivity for the students with ADHD when seated on therapy balls. Social validity findings indicated that generally the teacher and students preferred therapy balls. CONCLUSION: This study provides evidence that use of therapy balls for students with ADHD may facilitate in-seat behavior and legible word productivity.  相似文献   
63.
64.
65.
66.
67.
Little is known about oral health care behaviors of community-dwelling, cognitively impaired elderly (CIE) persons. Few studies have been conducted regarding the actual provision of oral care for CIE persons or the attitudes and concerns about oral health among their caregivers. The CIE person's ability to perform self-care decreases over time, and the role of the caregiver in daily oral care becomes increasingly important. The purpose of this pilot study was to explore the attitudes toward oral health and identify related concerns among caregivers who care for community-dwelling CIE persons. Caregivers were surveyed by means of a self-administered, mailed questionnaire. To maintain confidentiality, an intermediary was used for recruitment and data collection. Overall, 148 caregivers were invited by an intermediary to participate in the survey; only 21 (14%) consented to participate and returned the questionnaire. This paper discusses some of the numerous methodological challenges identified when an attempt was made to survey caregivers' attitudes toward and barriers to providing oral care for a dependent CIE.  相似文献   
68.
69.
We describe a simple, rapid, and semiautomated method of MR analysis based on mathematical modeling of MR pixel intensity histograms. The method is shown to be accurate and reliable for regional analysis of brain, central, and subarachnoid CSF volumes. Application of the method to five young and six older subjects revealed significant age-related changes in regional brain volumes whereas no difference was found for traced central CSF volumes or subarachnoid CSF volumes. We conclude that this is a simple method that can be applied to further studies of quantification of brain structure in healthy aging and brain disease.  相似文献   
70.
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