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   23211篇
  免费   410篇
  国内免费   32篇
教育   16816篇
科学研究   2016篇
各国文化   213篇
体育   1757篇
综合类   34篇
文化理论   199篇
信息传播   2618篇
  2022年   135篇
  2021年   231篇
  2020年   370篇
  2019年   506篇
  2018年   718篇
  2017年   803篇
  2016年   737篇
  2015年   447篇
  2014年   596篇
  2013年   4406篇
  2012年   580篇
  2011年   640篇
  2010年   503篇
  2009年   479篇
  2008年   535篇
  2007年   519篇
  2006年   465篇
  2005年   399篇
  2004年   385篇
  2003年   335篇
  2002年   394篇
  2001年   434篇
  2000年   407篇
  1999年   415篇
  1998年   221篇
  1997年   248篇
  1996年   264篇
  1995年   221篇
  1994年   216篇
  1993年   202篇
  1992年   314篇
  1991年   311篇
  1990年   332篇
  1989年   318篇
  1988年   308篇
  1987年   255篇
  1986年   272篇
  1985年   333篇
  1984年   274篇
  1983年   269篇
  1982年   204篇
  1981年   219篇
  1980年   181篇
  1979年   252篇
  1978年   218篇
  1977年   198篇
  1976年   169篇
  1975年   133篇
  1974年   125篇
  1973年   152篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
32.
33.
The project of studying children in order to understand them, which lies at the heart of contemporary thinking about children and their education, is misconceived. It rests, jrst of all, upon a false belief that we can only come to know something properly by deliberately and systematically pursuing knowledge of it. Secondly, it offers a paradigm of knowing children which justifies parents and teachers in not giving themselves to children. By re-interpreting the problems that adults experience with children as technical, as arising from lack of information about them, it ignores the personal and moral dimension of adults' relations with children and thus further alienates them from one another.  相似文献   
34.
35.
36.
This article discusses the changing relationships of authors and publishers, the current trends and challenges they face, and the direction of these relationships in the future. As the STM publishing industry finds itself in the midst of significant technological and economic changes, this article provides background to these changes and looks at the key elements, including open access business development, institutional repository trends, and emerging public financing policies in the future.  相似文献   
37.
38.
This investigation was undertaken in an effort to establish physiological characteristics of soccer players and to relate them to positional roles. A total of 135 footballers (age 24.4 +/- 4.6 years) were assessed for body mass, % body fat, haemoglobin, maximal oxygen uptake (VO2 max), leg power, anaerobic capacity and speed prior to an English league season. The sample included 13 goalkeepers, 22 full-backs, 24 centre-backs, 35 midfield players and 41 forwards. The goalkeepers were significantly heavier (86.1 +/- 5.5 kg; P < 0.01) than all groups except the centre-backs, had significantly higher estimated body fat percentages than centre-backs, forwards, midfield players (P < 0.01) or full-backs (P < 0.05), significantly lower estimated VO2 max values (56.4 +/- 3.9 ml kg-1 min-1; P < 0.01) and were slowest over 60 m (12.71 +/- 0.42 s). The midfield players had the highest predicted VO2 max values (61.4 +/- 3.4 ml kg-1 min-1), this being significantly greater (P < 0.05) than for the centre-backs. The forwards were the fastest group over 60 m (12.19 +/- 0.30 s), being significantly quicker than goalkeepers or centre-backs (P < 0.01) and full-backs (P < 0.05). Anaerobic power, as well as knee extensor torques (corrected for body mass) and extensor-flexor ratios, were similar between groups. No difference in estimated body fat percentage was observed between any of the outfield players, and haemoglobin concentrations were similar among players of all positions.(ABSTRACT TRUNCATED AT 250 WORDS)  相似文献   
39.
40.
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