全文获取类型
收费全文 | 30069篇 |
免费 | 460篇 |
国内免费 | 37篇 |
专业分类
教育 | 21735篇 |
科学研究 | 2451篇 |
各国文化 | 359篇 |
体育 | 2309篇 |
综合类 | 37篇 |
文化理论 | 312篇 |
信息传播 | 3363篇 |
出版年
2022年 | 179篇 |
2021年 | 295篇 |
2020年 | 496篇 |
2019年 | 685篇 |
2018年 | 951篇 |
2017年 | 1049篇 |
2016年 | 978篇 |
2015年 | 627篇 |
2014年 | 785篇 |
2013年 | 5870篇 |
2012年 | 764篇 |
2011年 | 835篇 |
2010年 | 666篇 |
2009年 | 621篇 |
2008年 | 771篇 |
2007年 | 685篇 |
2006年 | 624篇 |
2005年 | 555篇 |
2004年 | 496篇 |
2003年 | 499篇 |
2002年 | 526篇 |
2001年 | 547篇 |
2000年 | 507篇 |
1999年 | 509篇 |
1998年 | 309篇 |
1997年 | 329篇 |
1996年 | 361篇 |
1995年 | 320篇 |
1994年 | 317篇 |
1993年 | 280篇 |
1992年 | 404篇 |
1991年 | 396篇 |
1990年 | 420篇 |
1989年 | 394篇 |
1988年 | 366篇 |
1987年 | 309篇 |
1986年 | 319篇 |
1985年 | 390篇 |
1984年 | 322篇 |
1983年 | 325篇 |
1982年 | 265篇 |
1981年 | 276篇 |
1980年 | 249篇 |
1979年 | 304篇 |
1978年 | 263篇 |
1977年 | 236篇 |
1976年 | 208篇 |
1975年 | 171篇 |
1974年 | 155篇 |
1973年 | 172篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
S Grant T Hasler C Davies T C Aitchison J Wilson A Whittaker 《Journal of sports sciences》2001,19(7):499-505
There is limited information on the anthropometry, strength, endurance and flexibility of female rock climbers. The aim of this study was to compare these characteristics in three groups of females: Group 1 comprised 10 elite climbers aged 31.3 +/- 5.0 years (mean +/- s) who had led to a standard of 'hard very severe'; Group 2 consisted of 10 recreational climbers aged 24.1 +/- 4.0 years who had led to a standard of 'severe'; and Group 3 comprised 10 physically active individuals aged 28.5 +/- 5.0 years who had not previously rock-climbed. The tests included finger strength (grip strength, finger strength measured on climbing-specific apparatus), flexibility, bent arm hang and pull-ups. Regression procedures (analysis of covariance) were used to examine the influence of body mass, leg length, height and age. For finger strength, the elite climbers recorded significantly higher values (P < 0.05) than the recreational climbers and non-climbers (four fingers, right hand: elite 321 +/- 18 N, recreational 251 +/- 14 N, non-climbers 256 +/- 15 N; four fingers, left hand: elite 307 +/- 14 N, recreational 248 +/- 12 N, non-climbers 243 +/- 11 N). For grip strength of the right hand, the elite climbers recorded significantly higher values than the recreational climbers only (elite 338 +/- 12 N, recreational 289 +/- 10 N, non-climbers 307 +/- 11 N). The results suggest that elite climbers have greater finger strength than recreational climbers and non-climbers. 相似文献
22.
23.
24.
25.
Jacquetta Megarry David Hawkridge 《British journal of educational technology : journal of the Council for Educational Technology》1993,24(1):4-11
Co-production occurs when two or more institutions contribute funds and labour to the processes of making course components for distance teaching. The author summarises reasons for international co-production of multimedia distance-teaching courses and provides a checklist of questions that should be considered before entering upon such co-production.
The second half of the article consists of a composite case study based on the UK's Open University experience of international co-production. The paper ends with three questions: Is international co-production of this kind worth trying? Can the chances of success be made high enough by careful planning to justify risking capital in such ventures? Are other forms of collaboration more likely to be cost-effective? 相似文献
The second half of the article consists of a composite case study based on the UK's Open University experience of international co-production. The paper ends with three questions: Is international co-production of this kind worth trying? Can the chances of success be made high enough by careful planning to justify risking capital in such ventures? Are other forms of collaboration more likely to be cost-effective? 相似文献
26.
W. A. HART 《Journal of Philosophy of Education》1993,27(1):17-27
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
27.
28.
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
29.
30.