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   31077篇
  免费   503篇
  国内免费   41篇
教育   22090篇
科学研究   3013篇
各国文化   285篇
体育   2340篇
综合类   39篇
文化理论   257篇
信息传播   3597篇
  2022年   190篇
  2021年   331篇
  2020年   521篇
  2019年   722篇
  2018年   1033篇
  2017年   1075篇
  2016年   1001篇
  2015年   616篇
  2014年   866篇
  2013年   5802篇
  2012年   777篇
  2011年   880篇
  2010年   683篇
  2009年   655篇
  2008年   746篇
  2007年   698篇
  2006年   611篇
  2005年   547篇
  2004年   533篇
  2003年   454篇
  2002年   518篇
  2001年   579篇
  2000年   574篇
  1999年   551篇
  1998年   301篇
  1997年   352篇
  1996年   360篇
  1995年   287篇
  1994年   298篇
  1993年   259篇
  1992年   447篇
  1991年   407篇
  1990年   427篇
  1989年   434篇
  1988年   406篇
  1987年   331篇
  1986年   342篇
  1985年   418篇
  1984年   350篇
  1983年   345篇
  1982年   259篇
  1981年   266篇
  1980年   238篇
  1979年   330篇
  1978年   280篇
  1977年   247篇
  1976年   207篇
  1975年   173篇
  1974年   173篇
  1973年   194篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
41.
42.
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   
43.
44.
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   
45.
46.
47.
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   
48.
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