全文获取类型
收费全文 | 20545篇 |
免费 | 122篇 |
国内免费 | 6篇 |
专业分类
教育 | 14954篇 |
科学研究 | 2250篇 |
各国文化 | 325篇 |
体育 | 1036篇 |
综合类 | 4篇 |
文化理论 | 437篇 |
信息传播 | 1667篇 |
出版年
2021年 | 88篇 |
2020年 | 128篇 |
2019年 | 176篇 |
2018年 | 2358篇 |
2017年 | 2272篇 |
2016年 | 1757篇 |
2015年 | 253篇 |
2014年 | 299篇 |
2013年 | 1697篇 |
2012年 | 409篇 |
2011年 | 872篇 |
2010年 | 977篇 |
2009年 | 591篇 |
2008年 | 849篇 |
2007年 | 1337篇 |
2006年 | 240篇 |
2005年 | 551篇 |
2004年 | 610篇 |
2003年 | 469篇 |
2002年 | 239篇 |
2001年 | 155篇 |
2000年 | 200篇 |
1999年 | 157篇 |
1998年 | 86篇 |
1997年 | 93篇 |
1996年 | 75篇 |
1994年 | 67篇 |
1993年 | 81篇 |
1992年 | 137篇 |
1991年 | 154篇 |
1990年 | 148篇 |
1989年 | 155篇 |
1988年 | 122篇 |
1987年 | 117篇 |
1986年 | 117篇 |
1985年 | 156篇 |
1984年 | 128篇 |
1983年 | 120篇 |
1982年 | 100篇 |
1981年 | 81篇 |
1980年 | 90篇 |
1979年 | 141篇 |
1978年 | 88篇 |
1977年 | 90篇 |
1976年 | 79篇 |
1975年 | 76篇 |
1974年 | 88篇 |
1973年 | 80篇 |
1971年 | 74篇 |
1968年 | 74篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
981.
Despite difficulties, states frequently seek to compare their test performance with that of other states, or with the published national norms. All states have some students taking the Scholastic Aptitude Test (SAT) exams for college admissions, but because the numbers vary widely, when the state means are made public by the College Boards, there is debate about their interpretation. Here the 50 state SAT means are the criterion in a multivariate model, together with the state variables of percent taking the SATs (very influential), percent of minority in the state, average income, unemployment rate, and per pupil expenditure. Regression is analyzed (without expenditure) to examine the state residuals compared with the "expected" scores. And briefly noted is the difficulty of using alternative tests for such comparisons, as these are currently normed, selected, and used. 相似文献
982.
983.
984.
This paper reports a small-scale project to develop a prototype web-based information system to support teaching and learning
within the modern languages department of a comprehensive secondary school. The system was developed in close consultation
with the teaching staff and the work is presented within the broader context of knowledge management systems and their potential
use in an educational environment. 相似文献
985.
986.
987.
Emma Rooksby 《Ethics and Information Technology》2007,9(2):141-152
Much attention has been given in recent years to the moral status of commercial spam. Less attention has been focused on newer,
non-commercial varieties of spam, such as spam from political parties, community sector organizations and governments. This
article makes a start on evaluating the moral status of these non-commercial varieties of spam, drawing on arguments used
to evaluate commercial spam. 相似文献
988.
989.
B V Simon 《Bulletin of the Medical Library Association》1969,57(2):160-170
The need for administrative know-how in libraries is great. Problems of administration in libraries do not differ significantly from those in other types of organizations. It behooves librarians to be aware of modern management theory, as developed and tested in the environment of business, and to adopt such useful tools as operations analysis and the systems approach to problems in the library environment. 相似文献
990.