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   4729篇
  免费   306篇
  国内免费   2篇
  5037篇
  2024年   10篇
  2023年   84篇
  2022年   72篇
  2021年   102篇
  2020年   166篇
  2019年   173篇
  2018年   253篇
  2017年   286篇
  2016年   270篇
  2015年   166篇
  2014年   193篇
  2013年   590篇
  2012年   337篇
  2011年   359篇
  2010年   215篇
  2009年   113篇
  2008年   294篇
  2007年   239篇
  2006年   249篇
  2005年   130篇
  2004年   129篇
  2003年   103篇
  2002年   78篇
  2001年   45篇
  2000年   44篇
  1999年   40篇
  1998年   15篇
  1997年   22篇
  1996年   19篇
  1995年   16篇
  1994年   17篇
  1993年   18篇
  1992年   18篇
  1991年   10篇
  1990年   23篇
  1989年   13篇
  1988年   11篇
  1987年   11篇
  1986年   12篇
  1985年   9篇
  1984年   6篇
  1983年   5篇
  1981年   8篇
  1980年   4篇
  1979年   5篇
  1978年   4篇
  1977年   4篇
  1976年   6篇
  1975年   4篇
  1963年   3篇
排序方式: 共有5037条查询结果,搜索用时 0 毫秒
991.
992.
993.
994.
995.
996.
Many deaths from cardiopulmonary arrest can be prevented by the prompt and effective administration of cardiopulmonary resuscitation (CPR). In this study, we examined the standard training program for teaching CPR to emergency medical technicians (EMTs). We developed an alternative experimental program whereby the behaviors involved in CPR were assessed easily and in greater detail. This assessment provided the basis for a system in which effective CPR skills were reinforced and problems were corrected. Subjects who were trained in CPR according to this experimental program performed more effectively than subjects in the standard program. In addition, retention (maintenance) measures indicated that experimental subjects continued to perform well, often more effectively than professionally employed EMTs.  相似文献   
997.
Changes in scores on the State-Trait Anxiety Inventory for Children for a sample of 534 pubertal adolescents were longitudinally studied over a period of 4 years. Biological development and other variables were investigated. For the 310 boys, A-trait scores decreased significantly with age. The 224 girls showed significantly higher scores than boys in all years of the study. No significant relationship was found between anxiety and pubertal maturity. The year-to-year persistence in symptomatology of anxiety ranged between 55.6% and 66.1% for girls and between 48.5% and 53.1% for boys. Girls showed bi- and tri-annual persistence between 31% and 50%, and boys between 13% and 27%. Neuroticism scores formed the best predictor of A-trait scores. Symptomatology of anxiety is not transient during early adolescence, so personality may provide a risk indicator in the development of anxiety.  相似文献   
998.
999.
We described a patient with a dramatic deficit of both word comprehension and naming but with good preservation of visual pictorial semantics. On word-picture matching, his performances were slightly better than expected based on the observed lexical semantic disorder; in addition, the patient, who maintained good preservation of his underlying phonology, showed a tendency to point to the picture phonologically related to the target. In order to interpret these data, we advanced the hypothesis that the patient, in spite of his virtually complete inability to name, would be able, in a word-picture matching task, to "covertly" (i.e., preverbally) retrieve the name from the picture and to use this name to attempt a match with the phonological form of the stimulus word. This mechanism, that we called "phonological" comprehension, would allow the identification of the correct target and would explain the choice of the phonologically related foil that was sometimes selected.  相似文献   
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