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   64408篇
  免费   2630篇
  国内免费   37篇
  2020年   710篇
  2019年   878篇
  2018年   1269篇
  2017年   1244篇
  2016年   1328篇
  2015年   914篇
  2014年   1125篇
  2013年   5412篇
  2012年   2031篇
  2011年   2122篇
  2010年   1298篇
  2009年   1291篇
  2008年   1943篇
  2007年   1928篇
  2006年   1707篇
  2005年   1577篇
  2004年   1508篇
  2003年   1360篇
  2002年   1437篇
  2001年   2226篇
  2000年   2121篇
  1999年   1585篇
  1998年   799篇
  1997年   696篇
  1996年   648篇
  1995年   620篇
  1994年   596篇
  1993年   618篇
  1992年   1288篇
  1991年   1214篇
  1990年   1205篇
  1989年   1081篇
  1988年   1030篇
  1987年   1015篇
  1986年   998篇
  1985年   1057篇
  1984年   863篇
  1983年   744篇
  1982年   601篇
  1979年   835篇
  1978年   631篇
  1975年   749篇
  1974年   823篇
  1973年   796篇
  1972年   699篇
  1971年   634篇
  1969年   589篇
  1968年   727篇
  1967年   690篇
  1966年   613篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
102.
103.
104.
105.
The principles, design considerations, and components of a clinical information system intended to support and enhance the patient care, educational, and research missions of a comprehensive psychiatric institute are presented. Major characteristics of the system are its emphases on efficiency, simplicity, and intensive user involvement throughout the development of the system.  相似文献   
106.
Adherence to medications for chronic pediatric diseases decreases overtime. This randomized controlled trial evaluated a clinic-based, nurse-administered educational and behavioral intervention to prevent the anticipated drop in adherence to nonsteroidal medications among newly diagnosed patients with juvenile rheumatoid arthritis. Thirty-four participants completed the study (mean age = 8.44 years, SD = 3.96), including 19 in the experimental group and 15 in the standard-treatment (education) control group. There were significant group and Group x Time effects for adherence (assessed with an electronic monitor over a 13-month period) favoring the experimental group. In contrast, the groups did not differ significantly in disease activity or functional limitations. Factors that may have prevented detection of differences in these health parameters are dicussed.  相似文献   
107.
108.
109.
Developing readers often make anagrammatical errors (e.g. misreading pirates as parties), suggesting they use letter position flexibly during word recognition. However, while it is widely assumed that the occurrence of these errors decreases with increases in reading skill, empirical evidence to support this distinction is lacking. Accordingly, we compared the performance of developing child readers (aged 8–10 years) against the end‐state performance of skilled adult readers in a timed naming task, employing anagrams used previously in this area of research. Moreover, to explore the use of letter position by developing readers and skilled adult readers more fully, we used anagrams which, to form another word, required letter transpositions over only interior letter positions, or both interior and exterior letter positions. The patterns of effects across these two anagram types for the two groups of readers were very similar. In particular, both groups showed similarly slowed response times (and developing readers increased errors) for anagrams requiring only interior letter transpositions but not for anagrams that required exterior letter transpositions. This similarity in the naming performance of developing readers and skilled adult readers suggests that the end‐state skilled use of letter position is established earlier during reading development than is widely assumed.  相似文献   
110.
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