全文获取类型
收费全文 | 34620篇 |
免费 | 449篇 |
国内免费 | 24篇 |
专业分类
教育 | 24047篇 |
科学研究 | 3873篇 |
各国文化 | 332篇 |
体育 | 3051篇 |
综合类 | 12篇 |
文化理论 | 320篇 |
信息传播 | 3458篇 |
出版年
2021年 | 343篇 |
2020年 | 525篇 |
2019年 | 824篇 |
2018年 | 1114篇 |
2017年 | 1013篇 |
2016年 | 951篇 |
2015年 | 589篇 |
2014年 | 796篇 |
2013年 | 6318篇 |
2012年 | 704篇 |
2011年 | 746篇 |
2010年 | 606篇 |
2009年 | 621篇 |
2008年 | 644篇 |
2007年 | 615篇 |
2006年 | 568篇 |
2005年 | 492篇 |
2004年 | 518篇 |
2003年 | 434篇 |
2002年 | 451篇 |
2001年 | 604篇 |
2000年 | 660篇 |
1999年 | 567篇 |
1998年 | 341篇 |
1997年 | 332篇 |
1996年 | 405篇 |
1995年 | 319篇 |
1994年 | 343篇 |
1993年 | 309篇 |
1992年 | 450篇 |
1991年 | 488篇 |
1990年 | 451篇 |
1989年 | 497篇 |
1988年 | 433篇 |
1987年 | 427篇 |
1986年 | 460篇 |
1985年 | 497篇 |
1984年 | 417篇 |
1983年 | 408篇 |
1982年 | 346篇 |
1981年 | 328篇 |
1980年 | 352篇 |
1979年 | 469篇 |
1978年 | 367篇 |
1977年 | 327篇 |
1976年 | 282篇 |
1975年 | 250篇 |
1974年 | 281篇 |
1973年 | 266篇 |
1971年 | 249篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
111.
112.
Since a sizeable hospital must have a library, it must have a library committee. Like all hospital committees, this one is to help maintain standards of medical care and to mediate between staff and administration. Unlike others, it clusters around one elected member (the chairman) and one employee (the librarian). A dynamic librarian can, and should, influence and inspire the committee's deliberations; and must be able to depend upon the support of the physician members of the committee. 相似文献
113.
J. Weltman 《Learning, Media and Technology》1991,17(1):5-14
The immediate circumstances of the new Broadcasting Act are discussed. The impact of this legislation on schools broadcasting is then considered in relation to the history of earlier legislation in the UK, and the early responses to the Television Act of 1954. The importance of the personnel involved in television production and their commitment to the values of public service is stressed, and placed against the gloomier forebodings of the pessimists of the past‐‐and of today. The article concludes with the assertion that it is the people in the television industry itself, and the values they hold, that will ensure the continued survival of good schools television. 相似文献
114.
Time series analysis was used to investigate the hypothesis that during acquisition of a motor skill, knowledge of results (KR) information is used to generate a stable internal referent about which response errors are randomly distributed. Sixteen subjects completed 50 acquisition trials of each of three movements whose spatial-temporal characteristics differed. Acquisition trials were either blocked, with each movement being presented in series, or randomized, with the presentation of movements occurring in random order. Analysis of movement time data indicated the contextual interference effect reported in previous studies was replicated in the present experiment. Time series analysis of the acquisition trial data revealed the majority of individual subject response patterns during blocked trials were best described by a model with a temporarily stationary, internal reference of the criterion and systematic, trial-to-trial variation of response errors. During random trial conditions, response patterns were usually best described by a "White-noise" model. This model predicts a permanently stationary, internal reference associated with randomly distributed response errors that are unaffected by KR information. These results are not consistent with previous work using time series analysis to describe motor behavior (Spray & Newell, 1986). 相似文献
115.
116.
117.
118.
119.
120.