全文获取类型
收费全文 | 28266篇 |
免费 | 466篇 |
国内免费 | 20篇 |
专业分类
教育 | 19937篇 |
科学研究 | 2696篇 |
各国文化 | 262篇 |
体育 | 2366篇 |
综合类 | 13篇 |
文化理论 | 201篇 |
信息传播 | 3277篇 |
出版年
2022年 | 202篇 |
2021年 | 305篇 |
2020年 | 464篇 |
2019年 | 734篇 |
2018年 | 977篇 |
2017年 | 974篇 |
2016年 | 851篇 |
2015年 | 514篇 |
2014年 | 777篇 |
2013年 | 5394篇 |
2012年 | 750篇 |
2011年 | 762篇 |
2010年 | 580篇 |
2009年 | 585篇 |
2008年 | 659篇 |
2007年 | 589篇 |
2006年 | 516篇 |
2005年 | 493篇 |
2004年 | 441篇 |
2003年 | 433篇 |
2002年 | 418篇 |
2001年 | 567篇 |
2000年 | 497篇 |
1999年 | 463篇 |
1998年 | 252篇 |
1997年 | 253篇 |
1996年 | 294篇 |
1995年 | 291篇 |
1994年 | 235篇 |
1993年 | 248篇 |
1992年 | 409篇 |
1991年 | 374篇 |
1990年 | 369篇 |
1989年 | 402篇 |
1988年 | 320篇 |
1987年 | 359篇 |
1986年 | 331篇 |
1985年 | 385篇 |
1984年 | 298篇 |
1983年 | 276篇 |
1982年 | 260篇 |
1981年 | 214篇 |
1980年 | 207篇 |
1979年 | 322篇 |
1978年 | 245篇 |
1977年 | 221篇 |
1976年 | 205篇 |
1975年 | 169篇 |
1974年 | 191篇 |
1973年 | 165篇 |
排序方式: 共有10000条查询结果,搜索用时 109 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.
T Bianco 《Research quarterly for exercise and sport》2001,72(4):376-388
Research suggests that social support can be an important coping resource for athletes recovering from sport injury. Few studies have investigated this claim, however. To address this gap in the literature, 10 elite downhill skiers who had recovered from serious sport injuries were interviewed about the sources of stress associated with injury and the role of social support in recovery from sport injury. This paper presents the social supportfindings that emergedfrom this research'. Content analyses of the social support data revealed that the skiers needed various types of emotional, informational, and tangible support from the occurrence of injury through the return to full activity. Members of the treatment team, the ski team, and the skiers' home support net works provided social support throughout these phases. In general, the skiers were satisfied with the support received, indicating that it reduced distress and kept them motivated throughout recovery. The findings from this research have implications for the design of sport injury interventions. 相似文献
15.
16.
17.
18.
19.
Lisa M. W. DaDeppo 《Learning disabilities research & practice》2009,24(3):122-131
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
20.