全文获取类型
收费全文 | 17321篇 |
免费 | 244篇 |
国内免费 | 120篇 |
专业分类
教育 | 11997篇 |
科学研究 | 2133篇 |
各国文化 | 141篇 |
体育 | 1588篇 |
综合类 | 12篇 |
文化理论 | 167篇 |
信息传播 | 1647篇 |
出版年
2022年 | 120篇 |
2021年 | 157篇 |
2020年 | 297篇 |
2019年 | 445篇 |
2018年 | 594篇 |
2017年 | 537篇 |
2016年 | 535篇 |
2015年 | 335篇 |
2014年 | 418篇 |
2013年 | 3054篇 |
2012年 | 374篇 |
2011年 | 391篇 |
2010年 | 287篇 |
2009年 | 278篇 |
2008年 | 283篇 |
2007年 | 316篇 |
2006年 | 305篇 |
2005年 | 288篇 |
2004年 | 274篇 |
2003年 | 261篇 |
2002年 | 256篇 |
2001年 | 267篇 |
2000年 | 283篇 |
1999年 | 280篇 |
1998年 | 152篇 |
1997年 | 155篇 |
1996年 | 194篇 |
1995年 | 174篇 |
1994年 | 139篇 |
1993年 | 148篇 |
1992年 | 222篇 |
1991年 | 227篇 |
1990年 | 240篇 |
1989年 | 263篇 |
1988年 | 212篇 |
1987年 | 226篇 |
1986年 | 219篇 |
1985年 | 251篇 |
1984年 | 223篇 |
1983年 | 213篇 |
1982年 | 177篇 |
1981年 | 169篇 |
1980年 | 158篇 |
1979年 | 245篇 |
1978年 | 190篇 |
1977年 | 182篇 |
1976年 | 149篇 |
1975年 | 133篇 |
1974年 | 151篇 |
1973年 | 133篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
961.
R. GOBIN 《European Journal of Engineering Education》1987,12(3):253-257
Engineering education should be relevant to the needs of our industry as industry absorbs the large majority of our engineering students, either directly or indirectly. The contact between industry and engineering students has therefore to be stimulated. As no legal obligation exists in Belgium, this is left entirely to the initiative of the professors and the engineers in industry. We will explain how at our university those contacts are developed for the mechanical engineering students. We will explain our aims, our working conditions and circumstances, our results and the role of the research. The art however is to stimulate the students, and to convince the industry of the importance of those contacts in the education of our and their future engineers. 相似文献
962.
Many practical issues face information specialists engaged in the preparation of documentation for CD-ROM publication. This
article discusses the technologies involved in the production and use of CD-ROM documents and their bearing on issues of document
design, preparation, storage, and revision.
Mark R. Buckley manages a software development group in Bellcore’s Information Management Services division. He also participates
in the Information Products Interchange work group of the Telecommunications Industry Forum where he chairs a subgroup on
SGML (the Standard Generalized Markup Language). Address for correspondence 相似文献
964.
965.
966.
967.
A method is described for determining multiple loop feedback topologies which yield minimum sensitivities for symmetrical, all-pole bandpass filters. The procedure begins with a follow-the-leader feedback (FLF) topology and additional feedback loops are constructed until minimum sensitivity is achieved. Filters comprised of identical second-order sections and non-identical sections, respectively, are considered. 相似文献
968.
969.
970.
Raquel Cerdán Eduardo Vidal-Abarca Tomás Martínez Ramiro Gilabert Laura Gil 《Learning and Instruction》2009,19(1):13-27
This study examined the effect of (a) high- and low-level questions and (b) reading the text before the questions asked on performance, delayed text recall, and deep text comprehension, as well as on specific text-inspection patterns. Participants were 37 undergraduate students who answered either high- or low-level questions using the software Read&Answer to read and answer questions on the computer screen. Additionally, half of the sample read first a text and then answered the questions (reading-first condition), whereas the other half answered the questions without having read the text in advance (no-reading-first condition). All participants had the text available to search for the answer. Results indicated that high-level questions facilitated deep comprehension but not immediate performance or delayed recall of text, independently of the reading condition, and that high- and low-level questions differentially affected text-inspection patterns. 相似文献