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   72323篇
  免费   2839篇
  国内免费   37篇
  75199篇
  2020年   752篇
  2019年   908篇
  2018年   1333篇
  2017年   1345篇
  2016年   1405篇
  2015年   961篇
  2014年   1182篇
  2013年   6005篇
  2012年   2119篇
  2011年   2302篇
  2010年   1406篇
  2009年   1403篇
  2008年   2134篇
  2007年   2063篇
  2006年   1860篇
  2005年   1657篇
  2004年   1621篇
  2003年   1514篇
  2002年   1578篇
  2001年   2222篇
  2000年   2122篇
  1999年   1656篇
  1998年   875篇
  1997年   788篇
  1996年   742篇
  1995年   735篇
  1993年   684篇
  1992年   1387篇
  1991年   1316篇
  1990年   1280篇
  1989年   1162篇
  1988年   1152篇
  1987年   1112篇
  1986年   1165篇
  1985年   1205篇
  1984年   977篇
  1983年   851篇
  1979年   987篇
  1978年   766篇
  1976年   694篇
  1975年   880篇
  1974年   988篇
  1973年   979篇
  1972年   841篇
  1971年   784篇
  1970年   725篇
  1969年   754篇
  1968年   914篇
  1967年   864篇
  1966年   821篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
21.
22.
We investigated eye‐movements during preschool children's pictorial recall of seen objects. Thirteen 3‐ to 4‐year‐old children completed a perceptual encoding and a pictorial recall task. First, they were exposed to 16 pictorial objects, which were positioned in one of four distinct areas on the computer screen. Subsequently, they had to recall these pictorial objects from memory in order to respond to specific questions about visual details. We found that children spent more time fixating the areas in which the pictorial objects were previously displayed. We conclude that as early as age 3–4 years old, children show specific eye‐movements when they recall pictorial contents of previously seen objects.  相似文献   
23.
24.
OBJECTIVE: To test a theoretical model of how ethnic pride and self-control are related to risk and protective factors. DESIGN: A community sample of 670 African American youth (mean age = 11.2 years) were interviewed in households. MAIN OUTCOME MEASURES: Measures of cigarette smoking, alcohol use, and sexual behavior (lifetime to past month). RESULTS: Structural modeling analyses indicated parenting was related to self-control and self-esteem, and racial socialization was related to ethnic pride. Self-control and self-esteem variables were related to levels of deviance-prone attitudes and to perceptions of engagers in, or abstainers from, substance use and sexual behavior. The proximal factors (behavioral willingness, resistance efficacy, and peer behavior) had substantial relations to the criterion variables. Participant gender and parental education also had several paths in the model. Results were generally similar for the 2 outcome behaviors. CONCLUSIONS: In this population, self-esteem and self-control are related to parenting approaches and have pathways to attitudes and social perceptions that are significant factors for predisposing to, or protecting against, early involvement in substance use and sexual behavior.  相似文献   
25.
26.
Two studies tested the hypothesis that certain positive emotions speed recovery from the cardiovascular sequelae of negative emotions. In Study 1, 60 subjects (Ss) viewed an initial fear-eliciting film, and were randomly assigned to view a secondary film that elicited: (a) contentment; (b) amusement; (c) neutrality; or (d) sadness. Compared to Ss who viewed the neutral and sad secondary films, those who viewed the positive films exhibited more rapid returns to pre-film levels of cardiovascular activation. In Study 2, 72 Ss viewed a film known to elicit sadness. Fifty Ss spontaneously smiled at least once while viewing this film. Compared to Ss who did not smile, those who smiled exhibited more rapid returns to pre-film levels of cardiovascular activation. We discuss these findings in terms of emotion theory and possible health-promoting functions of positive emotions.  相似文献   
27.
28.
29.
30.
The essay examines intellectual virtue in the Summa theologiae, taking it as an interpretative key to the epistemology of the Summa theologiae as a whole. Because Aquinas blurs the line between the acquired and the theological virtues, and between virtues and the gifts of the Spirit, it becomes impossible to maintain the distinction between the realms of nature and grace, or between natural reason and revealed truth: grace permeates the most ordinary activities of human reasoning. This reading of the Summa theologiae raises questions about many contemporary debates, particularly those concerning natural law.  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