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   3115篇
  免费   13篇
教育   2161篇
科学研究   545篇
各国文化   3篇
体育   99篇
综合类   7篇
文化理论   68篇
信息传播   245篇
  2023年   6篇
  2022年   7篇
  2021年   21篇
  2020年   13篇
  2019年   20篇
  2018年   72篇
  2017年   121篇
  2016年   180篇
  2015年   121篇
  2014年   64篇
  2013年   85篇
  2012年   159篇
  2011年   178篇
  2010年   88篇
  2009年   33篇
  2008年   72篇
  2007年   59篇
  2006年   51篇
  2005年   690篇
  2004年   473篇
  2003年   300篇
  2002年   133篇
  2001年   66篇
  2000年   32篇
  1999年   29篇
  1998年   8篇
  1997年   5篇
  1996年   7篇
  1995年   5篇
  1994年   1篇
  1993年   2篇
  1992年   3篇
  1991年   1篇
  1990年   3篇
  1989年   2篇
  1988年   4篇
  1987年   5篇
  1985年   1篇
  1980年   1篇
  1976年   2篇
  1974年   1篇
  1970年   1篇
  1969年   1篇
  1966年   1篇
  1931年   1篇
排序方式: 共有3128条查询结果,搜索用时 15 毫秒
101.
102.
103.
What happens when a government cannot meet its obligation to provide universal primary education and enhance the quality of education for all of its citizens? The present study examines the interactions among stakeholders in the user-fee policy in primary education in Kenya. It seeks to show how this policy has affected attendance rates and drop-out rates among elementary schoolchildren. It reveals that, in addition to limiting access and contributing to attrition, user-fees significantly contribute to absenteeism. The study also exposes the dire situation of economically vulnerable citizens who do not have the resources which they need to ensure private education for their children. It concludes that together the government and household-level economic weaknesses have made it virtually impossible to attain the goal of education for all in Kenya.  相似文献   
104.
105.
106.
107.
This review highlights two areas of particular interest in the study of social learning in fowl. First, the role of social learning in the development of feeding and foraging behavior in young chicks and older birds is described. The role of the hen as a demonstrator and possible teacher is considered, and the subsequent social influence of brood mates and other companions on food avoidance and food preference learning is discussed. Second, the way in which work on domestic fowl has contributed to an understanding of the importance of directed social learning is examined. The well-characterized hierarchical social organization of small chicken flocks has been used to design studies which demonstrate that the probability of social transmission is strongly influenced by social relationships between birds. The practical implications of understanding the role of social learning in the spread of injurious behaviors in this economically important species are briefly considered.  相似文献   
108.
In three experiments, rats received pairings of flavor conditioned stimuli with polycose unconditioned stimuli, in either a simultaneous or a sequential relation. Both temporal relations produced excellent conditioned increases in consumption of the flavors. Separate presentation of the flavors resulted in extinction in both cases. However, restoring the pairing of the flavor with polycose resulted in reconditioning only with the sequential, not with the simultaneous, relation.  相似文献   
109.
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