全文获取类型
| 收费全文 | 18671篇 |
| 免费 | 217篇 |
| 国内免费 | 119篇 |
专业分类
| 教育 | 12916篇 |
| 科学研究 | 2474篇 |
| 各国文化 | 109篇 |
| 体育 | 1420篇 |
| 综合类 | 11篇 |
| 文化理论 | 218篇 |
| 信息传播 | 1859篇 |
出版年
| 2021年 | 106篇 |
| 2020年 | 209篇 |
| 2019年 | 311篇 |
| 2018年 | 1050篇 |
| 2017年 | 1022篇 |
| 2016年 | 825篇 |
| 2015年 | 289篇 |
| 2014年 | 326篇 |
| 2013年 | 2625篇 |
| 2012年 | 369篇 |
| 2011年 | 618篇 |
| 2010年 | 514篇 |
| 2009年 | 382篇 |
| 2008年 | 447篇 |
| 2007年 | 562篇 |
| 2006年 | 276篇 |
| 2005年 | 347篇 |
| 2004年 | 380篇 |
| 2003年 | 328篇 |
| 2002年 | 263篇 |
| 2001年 | 257篇 |
| 2000年 | 287篇 |
| 1999年 | 275篇 |
| 1998年 | 142篇 |
| 1997年 | 155篇 |
| 1996年 | 183篇 |
| 1995年 | 169篇 |
| 1994年 | 131篇 |
| 1993年 | 142篇 |
| 1992年 | 216篇 |
| 1991年 | 223篇 |
| 1990年 | 230篇 |
| 1989年 | 258篇 |
| 1988年 | 209篇 |
| 1987年 | 225篇 |
| 1986年 | 219篇 |
| 1985年 | 250篇 |
| 1984年 | 222篇 |
| 1983年 | 211篇 |
| 1982年 | 176篇 |
| 1981年 | 168篇 |
| 1980年 | 157篇 |
| 1979年 | 244篇 |
| 1978年 | 190篇 |
| 1977年 | 179篇 |
| 1976年 | 130篇 |
| 1975年 | 124篇 |
| 1974年 | 139篇 |
| 1973年 | 121篇 |
| 1971年 | 113篇 |
排序方式： 共有10000条查询结果，搜索用时 15 毫秒
51.
52.
53.
"Change" is a critical dimension of contemporary experience. Library associations are not exempt, and they change in ways similar to other organizations. According to some authorities, four phases typify the process: diagnosis, design, implementation, and incorporation. Focusing on changes in the Medical Library Association's longstanding program of continuing education, the authors utilize the "phase framework" to chart that association's movement from a management system depending primarily upon volunteers to one in which professional staff figure prominently. The historical review serves a heuristic purpose for individuals and institutions in identifying characteristic features of the change process. 相似文献
54.
55.
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
56.
57.
58.
59.
60.