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   123418篇
  免费   1633篇
  国内免费   239篇
教育   85741篇
科学研究   13490篇
各国文化   2032篇
体育   9314篇
综合类   177篇
文化理论   1135篇
信息传播   13401篇
  2021年   963篇
  2020年   1695篇
  2019年   2616篇
  2018年   3126篇
  2017年   3442篇
  2016年   3490篇
  2015年   2388篇
  2014年   3246篇
  2013年   27714篇
  2012年   2384篇
  2011年   2761篇
  2010年   2366篇
  2009年   2653篇
  2008年   2419篇
  2007年   2148篇
  2006年   2376篇
  2005年   2365篇
  2004年   3034篇
  2003年   2362篇
  2002年   2172篇
  2001年   1973篇
  2000年   1642篇
  1999年   1519篇
  1998年   1471篇
  1997年   1550篇
  1996年   1728篇
  1995年   1488篇
  1994年   1492篇
  1993年   1490篇
  1992年   1466篇
  1991年   1375篇
  1990年   1362篇
  1989年   1273篇
  1988年   1158篇
  1987年   1070篇
  1986年   1104篇
  1985年   1381篇
  1984年   1260篇
  1983年   1245篇
  1982年   1252篇
  1981年   1170篇
  1980年   1154篇
  1979年   1209篇
  1978年   1200篇
  1977年   1106篇
  1976年   990篇
  1975年   800篇
  1974年   788篇
  1973年   752篇
  1971年   605篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
961.
962.
963.
There is much interest in science courses in high school and student attitudes toward those courses. A valid and reliable instrument that measures such attitudes is not available. This study first developed and validated the Attitude toward Science in School Assessment (ATSSA). The instrument was used to evaluate the relationship between such attitude and achievement in science. A low correlation was found between attitude and various achievement tests. A moderate correlation was found between attitude and achievement that included an evaluation of the quality of work, as in a course grade.  相似文献   
964.
965.
966.

The present article gives an outline of the state of art in computer assisted intervention by learning-concomitant differential feedback. Based on the spectrum of possible meanings and interpretations given to the concepts ‘interaction’ and ‘interactive’ this concept is elaborated and illustrated by prototypical theoretical approaches. Based on our own empirical findings arguments are given showing that sophisticated audiovisual interactive new technologies can properly be used even on the small machines available in schools if the content materials and the flow of control given to the learner are carefully designed and based on principles of cognitive science.

  相似文献   
967.
968.
This study reports the results of extensive interviews with an intact sample of moderately delinquent adolescents concerning their sexual assault histories. Findings indicate a surprisingly high incidence of victimization among the females interviewed which, the authors suggest, may characterize the larger population of delinquent females. The behavioral-situational contexts of reported victimization experiences are examined for salient commonalities and the following composite rape scenerio can be cast from the data: An unsupervised, 14-year-old female, who has been consuming alcohol or marijuana, is sexually assaulted, following threat and/or force, to the point of penile-vaginal penetration, by an older male friend or acquaintance (who has also consumed alcohol or marijuana) in his home or vehicle or other place where she is inherently unprotected. Some comments are offered concerning the requirements of an effective technology of child rape prevention.  相似文献   
969.
970.
Sequence learning in pigeons was studied in asimultaneous chaining paradigm: all stimuli and the opportunity to respond to each stimulus were available simultaneously. In contrast to the traditionalsuccessive chaining paradigm, a simultaneous chaining paradigm provides no differential feedback following each response (except the last). Subjects were first trained to perform on sequences of two (AB), then three (ABC), and then four colors (ABCD). Performance greatly exceeded that predicted by models of random choice. Generalization to novel arrays of three and four colors was complete. After training with a four-color sequence, the subjects were tested with subsequences consisting of all possible combinations of two and three of the four training colors (e.g., BD, AD, BC, ACD, BCD, etc.). The successful completion of these subsequences showed that the organization of the original sequence did not entail overt pecks to successive elements of that sequence. That subjects can respond accurately on nonadjacent subsets is not readily explained by a chaining theory, or by any theory that assumes that responding to element n provides a cue for responding to element n+1.  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