全文获取类型
收费全文 | 126597篇 |
免费 | 1910篇 |
国内免费 | 248篇 |
专业分类
教育 | 88174篇 |
科学研究 | 13571篇 |
各国文化 | 1995篇 |
体育 | 9789篇 |
综合类 | 195篇 |
文化理论 | 1111篇 |
信息传播 | 13920篇 |
出版年
2021年 | 970篇 |
2020年 | 1674篇 |
2019年 | 2609篇 |
2018年 | 3183篇 |
2017年 | 3482篇 |
2016年 | 3512篇 |
2015年 | 2371篇 |
2014年 | 3245篇 |
2013年 | 27749篇 |
2012年 | 2503篇 |
2011年 | 2913篇 |
2010年 | 2480篇 |
2009年 | 2719篇 |
2008年 | 2541篇 |
2007年 | 2316篇 |
2006年 | 2491篇 |
2005年 | 2471篇 |
2004年 | 3125篇 |
2003年 | 2434篇 |
2002年 | 2289篇 |
2001年 | 2128篇 |
2000年 | 1793篇 |
1999年 | 1684篇 |
1998年 | 1508篇 |
1997年 | 1561篇 |
1996年 | 1727篇 |
1995年 | 1494篇 |
1994年 | 1501篇 |
1993年 | 1486篇 |
1992年 | 1532篇 |
1991年 | 1464篇 |
1990年 | 1467篇 |
1989年 | 1376篇 |
1988年 | 1255篇 |
1987年 | 1173篇 |
1986年 | 1202篇 |
1985年 | 1470篇 |
1984年 | 1335篇 |
1983年 | 1316篇 |
1982年 | 1267篇 |
1981年 | 1190篇 |
1980年 | 1176篇 |
1979年 | 1266篇 |
1978年 | 1225篇 |
1977年 | 1138篇 |
1976年 | 1014篇 |
1975年 | 824篇 |
1974年 | 821篇 |
1973年 | 788篇 |
1971年 | 637篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
72.
As a group, students with learning disabilities (LD) have social difficulties. One possible explanation for these difficulties is the unique way they process social information. Although students with LD may differ from their nondisabled peers in their social cognition, investigators have suggested the presence of subgroups within the population of students with LD who may differ in their social competence and, thereby, shed light on the source of the difficulties. The present exploratory study examined how two subgroups of students with LD in inclusive settings, students with high and low social status, perceive social situations. Using a sociometric technique, three students with LD receiving high social‐status ratings and three students with LD receiving low social‐status ratings were identified. A qualitative approach was used to gather and evaluate data from the participants and their teachers. Results suggested differences between the two subgroups in their (1) sensitivity to cues in the environment, (2) interpretation of social situations in relation to their own experiences, and (3) levels of self‐control. Implications of these findings for practice and future research are discussed. 相似文献
73.
74.
G. Gage Kingsbury 《Educational Measurement》1990,9(2):3-6
What is the rationale for adapting an existing testing system instead of developing your own? What are the limitations of MicroCAT? What has to be modified in order to meet local needs and to realize the potential of adaptive testing in the context of an existing testing system? 相似文献
75.
浅谈如何上好艺术体操选修课 总被引:1,自引:1,他引:0
对普通高校艺术体操选修课教学从形体姿态的培养、教学成套动作的编排,音乐的选择及口令、手势的运用等,进行了分析探讨. 相似文献
76.
77.
David C. Berliner 《Journal of Personnel Evaluation in Education》1990,4(1):75-90
78.
79.
80.
Measuring Search Engine Quality 总被引:12,自引:3,他引:9
The effectiveness of twenty public search engines is evaluated using TREC-inspired methods and a set of 54 queries taken from real Web search logs. The World Wide Web is taken as the test collection and a combination of crawler and text retrieval system is evaluated. The engines are compared on a range of measures derivable from binary relevance judgments of the first seven live results returned. Statistical testing reveals a significant difference between engines and high intercorrelations between measures. Surprisingly, given the dynamic nature of the Web and the time elapsed, there is also a high correlation between results of this study and a previous study by Gordon and Pathak. For nearly all engines, there is a gradual decline in precision at increasing cutoff after some initial fluctuation. Performance of the engines as a group is found to be inferior to the group of participants in the TREC-8 Large Web task, although the best engines approach the median of those systems. Shortcomings of current Web search evaluation methodology are identified and recommendations are made for future improvements. In particular, the present study and its predecessors deal with queries which are assumed to derive from a need to find a selection of documents relevant to a topic. By contrast, real Web search reflects a range of other information need types which require different judging and different measures. 相似文献