全文获取类型
收费全文 | 1751篇 |
免费 | 46篇 |
国内免费 | 27篇 |
专业分类
教育 | 1142篇 |
科学研究 | 257篇 |
各国文化 | 13篇 |
体育 | 162篇 |
综合类 | 68篇 |
文化理论 | 9篇 |
信息传播 | 173篇 |
出版年
2023年 | 7篇 |
2022年 | 43篇 |
2021年 | 62篇 |
2020年 | 77篇 |
2019年 | 54篇 |
2018年 | 74篇 |
2017年 | 93篇 |
2016年 | 70篇 |
2015年 | 79篇 |
2014年 | 101篇 |
2013年 | 228篇 |
2012年 | 96篇 |
2011年 | 114篇 |
2010年 | 99篇 |
2009年 | 95篇 |
2008年 | 83篇 |
2007年 | 87篇 |
2006年 | 67篇 |
2005年 | 42篇 |
2004年 | 45篇 |
2003年 | 40篇 |
2002年 | 30篇 |
2001年 | 20篇 |
2000年 | 19篇 |
1999年 | 5篇 |
1998年 | 10篇 |
1997年 | 11篇 |
1996年 | 5篇 |
1995年 | 2篇 |
1994年 | 5篇 |
1992年 | 4篇 |
1991年 | 2篇 |
1988年 | 2篇 |
1985年 | 2篇 |
1984年 | 2篇 |
1983年 | 3篇 |
1982年 | 4篇 |
1981年 | 3篇 |
1978年 | 2篇 |
1972年 | 3篇 |
1889年 | 1篇 |
1885年 | 3篇 |
1882年 | 6篇 |
1880年 | 5篇 |
1877年 | 1篇 |
1872年 | 1篇 |
1871年 | 1篇 |
1867年 | 2篇 |
1860年 | 1篇 |
1843年 | 1篇 |
排序方式: 共有1824条查询结果,搜索用时 15 毫秒
61.
The purpose of this study was to examine if steps/day taken by middle school students varied based on aerobic fitness classification. Middle school students (N = 223; 112 girls, 111 boys) were assigned to three aerobic fitness categories (HIGH, MOD, LOW) based on results of the FlTNESSGRAM PACER test. Four weekdays of pedometer monitoring determined activity levels (steps/day). Boys accumulated significantly more steps/day than girls, 11,589 +/- 3,270 and 10,232 +/- 2,517 steps/day, respectively; F(1,219) = 16.0, p < .001, eta2 = .055. There were no differences in steps/day between grades. HIGH fit participants accumulated significantly more steps/day, F(2, 217) = 12.2, p < .101, eta2 = .101, than moderately fit and low fit participants (approximately 1,491 and ; 2,867 steps/day, respectively). Middle school students who participated in sports in addition to physical education (PE) accumulated significantly more steps/day (approximately 980 steps/day) than those participating in PE only, F(1, 219) = 10.0, p < .01, eta2 = .044. Although the relationship between physical activity and aerobic fitness was moderate (0.35; p < .01), these data demonstrated significant differences in accumulated steps/day among youth of varying aerobic fitness levels. Whether improved fitness levels were the result of additional activity or the cause of it remains to be determined. Regardless, the fittest middle school students were also the most active and accumulated a significant amount of steps/day through organized extracurricular physical activities. 相似文献
62.
63.
64.
65.
Martin?VeselyEmail author Thomas?Baron Jean-Yves?Le?Meur Tibor?Simko 《Publishing Research Quarterly》2004,20(1):77-83
Conclusion In this paper we briefly described the current status of research in the field of digital libraries interoperability, mainly
with respect to federated data processing such as permitted within the Open Archive Initiative framework. We then presented
the CERN Document Server Software suite that is a free software package main-tained by CERN providing an online digital library
solution for mid- to large-sized document repositories. The set of CDSware modules was described and the differ-ences with
other existing tools briefly mentioned. Finally we have mentioned a typical usage statistics illustrating the scope of grey
literature and networked con-ditions of the CERN Document Server.
We pointed out that the current trend in grey literature management goes toward institutional repositories build upon the
distributed and federated model. Further research is going on within the CDS collaboration in this area, focused particularly
on (i) semantic interoperability using ontologies in distributed and federated data processing and (ii) ranking technologies
when searching grey literature in OAI compliant repositories. 相似文献
66.
67.
教育是立国之本,强国之路,面对当代科技革命的挑战,党和国家了适时的回应,和出全面推进素质教育的决定。在如何实施素质教育工作中,毛泽东同志关于“教学民主”、“知行统一”、“少而精”、“启发式”等一系列教学思想给我们提供了一定的思路和启迪。 相似文献
68.
69.
针对《学生体质健康标准》,结合实际工作的需要,运用软件工程自顶向下的开发方法对系统进行分析与设计,利用面向对象的开发工具Visual Basic 6.0和数据库开发工具Visual Foxpro 7.0实现该信息管理系统. 相似文献
70.