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   37286篇
  免费   453篇
  国内免费   35篇
教育   27433篇
科学研究   3419篇
各国文化   270篇
体育   2339篇
综合类   35篇
文化理论   603篇
信息传播   3675篇
  2022年   146篇
  2021年   263篇
  2020年   419篇
  2019年   597篇
  2018年   2899篇
  2017年   2904篇
  2016年   2353篇
  2015年   632篇
  2014年   799篇
  2013年   5126篇
  2012年   883篇
  2011年   1448篇
  2010年   1394篇
  2009年   969篇
  2008年   1257篇
  2007年   1729篇
  2006年   599篇
  2005年   847篇
  2004年   897篇
  2003年   757篇
  2002年   577篇
  2001年   474篇
  2000年   474篇
  1999年   461篇
  1998年   251篇
  1997年   285篇
  1996年   307篇
  1995年   255篇
  1994年   258篇
  1993年   223篇
  1992年   349篇
  1991年   338篇
  1990年   366篇
  1989年   346篇
  1988年   322篇
  1987年   272篇
  1986年   282篇
  1985年   346篇
  1984年   284篇
  1983年   269篇
  1982年   218篇
  1981年   234篇
  1980年   200篇
  1979年   257篇
  1978年   235篇
  1977年   205篇
  1976年   179篇
  1975年   139篇
  1974年   139篇
  1973年   160篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
52.
53.
54.
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   
55.
56.
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   
57.
58.
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   
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