全文获取类型
收费全文 | 2836篇 |
免费 | 44篇 |
国内免费 | 9篇 |
专业分类
教育 | 1964篇 |
科学研究 | 272篇 |
各国文化 | 61篇 |
体育 | 214篇 |
综合类 | 2篇 |
文化理论 | 22篇 |
信息传播 | 354篇 |
出版年
2023年 | 12篇 |
2022年 | 28篇 |
2021年 | 51篇 |
2020年 | 102篇 |
2019年 | 124篇 |
2018年 | 149篇 |
2017年 | 152篇 |
2016年 | 139篇 |
2015年 | 97篇 |
2014年 | 133篇 |
2013年 | 709篇 |
2012年 | 101篇 |
2011年 | 92篇 |
2010年 | 95篇 |
2009年 | 85篇 |
2008年 | 81篇 |
2007年 | 72篇 |
2006年 | 68篇 |
2005年 | 35篇 |
2004年 | 32篇 |
2003年 | 45篇 |
2002年 | 33篇 |
2001年 | 34篇 |
2000年 | 31篇 |
1999年 | 22篇 |
1998年 | 17篇 |
1997年 | 19篇 |
1996年 | 18篇 |
1995年 | 16篇 |
1994年 | 13篇 |
1993年 | 19篇 |
1992年 | 13篇 |
1991年 | 22篇 |
1990年 | 9篇 |
1989年 | 16篇 |
1988年 | 10篇 |
1987年 | 18篇 |
1986年 | 12篇 |
1985年 | 20篇 |
1984年 | 12篇 |
1983年 | 11篇 |
1982年 | 16篇 |
1981年 | 10篇 |
1980年 | 10篇 |
1979年 | 13篇 |
1978年 | 11篇 |
1977年 | 5篇 |
1975年 | 7篇 |
1973年 | 6篇 |
1971年 | 6篇 |
排序方式: 共有2889条查询结果,搜索用时 31 毫秒
191.
192.
193.
194.
In an effort to bring the advantages of television teaching to the maximum number of public schools, particularly those in hilly or sparsely settled parts of the country, a project has been launched to provide airborne transmission of six simultaneous school lesson program. Coverage area is increased approximately 20 to 1 by this means compared to the usual ground station coverage. Airborne transmission is the most economical and effective use of the available (UHF) frequency spectrum. Results already established regarding the use of television as a teaching medium are projected via an airplane flying at 23,000 feet altitude over an area covering parts of six Midwestern States. Educational advantages and problems inherent in ground station TV are intensified in this larger coverage area, and planning is governed accordingly. Technical problems include multiplex transmission of six lessons simultaneously, keeping the airplane on station, accommodation of transmitting equipment in the airplane, and determination of bandwidth for optimum picture quality. 相似文献
195.
196.
Tim Lee 《British Journal of Special Education》1991,18(3):100-102
How LEAs are measuring and allocating resources for special educational needs varies widely. Yet their formulae for doing so are likely to make the difference between enabling pupils with special needs to progress in their learning and, conversely, reducing the support they may need. Tim Lee, research fellow, Centre for the Analysis of Social Policy, Bath University, reports on the latest surveys of LEAs' funding policies. 相似文献
197.
198.
199.
200.
Seong-Soo Lee 《Instructional Science》1981,10(2):123-133
One hundred and thirty-two 10th graders performed either a conjunetive or biconditional rule task in one of six conditions defined by a 2 (tasks: attribute-identification versus rule-learning) by 3 (memory aids: 0 versus 3 versus 6) factorial design. Learners' attribute-identification was facilitated when six memory aids were made available, especially given the biconditional rule, but not when three aids were available. This effect was attributed to the facilitative role of six memory aids in the process of eliminating irrelevant dimensions. The acquisition of the biconditional rule was a linear function of the number of memory aids; but that of the conjunctive rule was not differentially affected by the memory aids. This interaction was attributed to the facilitative role of memory aids in the formation of a relatively complex one, not in the identification of a familiar, easy one. 相似文献