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   26614篇
  免费   455篇
  国内免费   16篇
教育   19102篇
科学研究   2253篇
各国文化   265篇
体育   2326篇
综合类   15篇
文化理论   264篇
信息传播   2860篇
  2022年   235篇
  2021年   367篇
  2020年   534篇
  2019年   867篇
  2018年   1136篇
  2017年   1104篇
  2016年   961篇
  2015年   606篇
  2014年   829篇
  2013年   5267篇
  2012年   773篇
  2011年   755篇
  2010年   560篇
  2009年   547篇
  2008年   604篇
  2007年   547篇
  2006年   480篇
  2005年   456篇
  2004年   403篇
  2003年   393篇
  2002年   377篇
  2001年   496篇
  2000年   413篇
  1999年   375篇
  1998年   224篇
  1997年   226篇
  1996年   265篇
  1995年   251篇
  1994年   197篇
  1993年   216篇
  1992年   337篇
  1991年   320篇
  1990年   320篇
  1989年   306篇
  1988年   265篇
  1987年   312篇
  1986年   273篇
  1985年   311篇
  1984年   252篇
  1983年   217篇
  1982年   195篇
  1981年   169篇
  1980年   157篇
  1979年   266篇
  1978年   187篇
  1977年   177篇
  1976年   160篇
  1975年   144篇
  1974年   149篇
  1971年   143篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
11.
Continuous observation of the physical activity of 56 preadolescent children was conducted in four regions of England from October 1988 to July 1989. Observations were undertaken during school break times, lunch times, and physical education lessons, as well as during the children's free time. Of total time observed, the children spent 32.4% of it engaged in moderate to vigorous physical activity (MVPA). Children were shown to be most active during school breaks and least active during free time at home. However, it is thought that cardiorespiratory benefits are best achieved by participation in sustained periods of MVPA. Only 8 (14%) of the 56 children were observed to participate in MVPA for sustained periods of 20 min or longer. A random sample of 55 physical education lessons was observed. Only 6 children engaged in MVPA for sustained periods of 5 min or more, and no children participated in MVPA for 10 min or longer. The implications of these results are that, although the children engaged in a reasonable amount of MVPA, it may not have been sustained for periods of sufficient length to produce a cardiovascular training response. Consideration is given to ways of promoting lifelong involvement in physical activity.  相似文献   
12.
13.
14.
15.
16.
17.
Despite increased enrollment, outcomes such as grade point average (GPA), persistence, and graduation rates for college students with learning disabilities (LD) continue to lag behind those of their nondisabled peers. Reasons for the differences vary but may include academic and social integration, factors identified as important to the success of college students in general. This research investigated the relative influence of background characteristics, precollege achievement, and college integration variables on the academic success and intent to persist of college freshmen and sophomores with LD. While academic and social integration were not unique predictors of college GPA, both integration variables were unique predictors of intent to persist. The findings suggest that beyond high school achievement and background characteristics, college experiences as captured by academic and social integration are promising constructs to help explain the persistence of college students with LD. Implications for future research and practices for high school and college personnel are discussed.  相似文献   
18.
19.
20.
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