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   16916篇
  免费   10篇
财政金融   2658篇
工业经济   765篇
计划管理   2582篇
经济学   3878篇
综合类   483篇
运输经济   5篇
旅游经济   3篇
贸易经济   4574篇
农业经济   4篇
经济概况   1354篇
信息产业经济   44篇
邮电经济   576篇
  2021年   1篇
  2020年   3篇
  2019年   7篇
  2018年   2304篇
  2017年   2055篇
  2016年   1216篇
  2015年   96篇
  2014年   100篇
  2013年   77篇
  2012年   448篇
  2011年   1961篇
  2010年   1847篇
  2009年   1523篇
  2008年   1520篇
  2007年   1873篇
  2006年   75篇
  2005年   388篇
  2004年   464篇
  2003年   552篇
  2002年   252篇
  2001年   61篇
  2000年   50篇
  1998年   16篇
  1997年   2篇
  1996年   14篇
  1995年   2篇
  1993年   2篇
  1992年   1篇
  1986年   13篇
  1984年   1篇
  1981年   1篇
  1971年   1篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
42.
43.
44.
45.
46.
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   
47.
48.
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   
49.
50.
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