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   16845篇
  免费   4篇
财政金融   2660篇
工业经济   765篇
计划管理   2568篇
经济学   3889篇
综合类   482篇
运输经济   2篇
旅游经济   1篇
贸易经济   4506篇
农业经济   2篇
经济概况   1357篇
信息产业经济   44篇
邮电经济   573篇
  2023年   2篇
  2021年   3篇
  2020年   1篇
  2019年   4篇
  2018年   2308篇
  2017年   2056篇
  2016年   1210篇
  2015年   97篇
  2014年   89篇
  2013年   70篇
  2012年   441篇
  2011年   1946篇
  2010年   1831篇
  2009年   1521篇
  2008年   1514篇
  2007年   1870篇
  2006年   69篇
  2005年   386篇
  2004年   465篇
  2003年   551篇
  2002年   252篇
  2001年   61篇
  2000年   50篇
  1999年   1篇
  1998年   19篇
  1997年   1篇
  1996年   14篇
  1992年   1篇
  1991年   1篇
  1986年   13篇
  1976年   1篇
  1968年   1篇
排序方式: 共有10000条查询结果,搜索用时 437 毫秒
51.
52.
53.
54.
55.
56.
Construction kits have played a significant part in nurturing the growth and development of the minds and manipulation-based skills of children (and adults) in formal and non-formal education settings. These kits have origins rooted in the representation of the built world and now have a diversity of form and function, including technical versions with moving parts. This article examines some of the historically based ideas that lie behind the role that kits may have in terms of physical modelling. The article traces the transformation of kits from simple bricks and blocks into more complicated pieces for space-filling and achieving the transfer of forces and motion. This transformation occurred during the Victorian era when the influence of the ideas of educationalists and, perhaps rather strangely, exponents of early aviation, played major roles in determining the diversity of forms of construction kit and modelled possibilities that are now to be seen in classrooms and homes. The article ends with a review of some of the lessons from the past and present that will need to be considered in relation to concrete modelling in schools for the future. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献   
57.
58.
In this article the impact of technology education, as a new learning area (subject) in the curriculum, on in-service teacher education in South Africa is described in order to ascertain the extent of the impact. The research on which this article is based draws on a variety of experiences and observations in the field at grassroots level (in particular an outreach project in rural communities). The envisaged impact of technology education on South African schools, communities, teacher educators and teachers, the range of in-service teacher education that is required, and the impacts in urban and rural areas are discussed. Finally a number of concluding remarks are made about the extent of the impact of the inclusion of technology education in the new National Curriculum Statement and whether the situation has changed since the implementation of a pilot technology education project in 1998. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献   
59.
60.
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