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   62454篇
  免费   2515篇
  国内免费   36篇
  2020年   764篇
  2019年   950篇
  2018年   1332篇
  2017年   1320篇
  2016年   1440篇
  2015年   945篇
  2014年   1192篇
  2013年   5691篇
  2012年   2111篇
  2011年   2260篇
  2010年   1404篇
  2009年   1432篇
  2008年   2129篇
  2007年   2066篇
  2006年   1829篇
  2005年   1641篇
  2004年   1667篇
  2003年   1501篇
  2002年   1523篇
  2001年   1916篇
  2000年   1829篇
  1999年   1427篇
  1998年   824篇
  1997年   711篇
  1996年   606篇
  1995年   640篇
  1994年   624篇
  1993年   630篇
  1992年   1117篇
  1991年   1048篇
  1990年   1029篇
  1989年   939篇
  1988年   913篇
  1987年   895篇
  1986年   883篇
  1985年   938篇
  1984年   771篇
  1983年   664篇
  1982年   562篇
  1981年   536篇
  1980年   524篇
  1979年   751篇
  1978年   584篇
  1976年   531篇
  1975年   651篇
  1974年   694篇
  1973年   645篇
  1972年   570篇
  1968年   554篇
  1967年   552篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
92.
93.
94.
95.
96.
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   
97.
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   
98.
99.
100.
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   
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