首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   138539篇
  免费   1901篇
  国内免费   241篇
教育   96989篇
科学研究   14802篇
各国文化   2024篇
体育   10329篇
综合类   173篇
文化理论   1470篇
信息传播   14894篇
  2021年   982篇
  2020年   1713篇
  2019年   2649篇
  2018年   5276篇
  2017年   5452篇
  2016年   5023篇
  2015年   2479篇
  2014年   3333篇
  2013年   27573篇
  2012年   2756篇
  2011年   3660篇
  2010年   3257篇
  2009年   3072篇
  2008年   3129篇
  2007年   3360篇
  2006年   2531篇
  2005年   2827篇
  2004年   3571篇
  2003年   2799篇
  2002年   2379篇
  2001年   2248篇
  2000年   1888篇
  1999年   1742篇
  1998年   1484篇
  1997年   1554篇
  1996年   1710篇
  1995年   1479篇
  1994年   1478篇
  1993年   1474篇
  1992年   1588篇
  1991年   1520篇
  1990年   1495篇
  1989年   1442篇
  1988年   1289篇
  1987年   1231篇
  1986年   1242篇
  1985年   1530篇
  1984年   1351篇
  1983年   1318篇
  1982年   1288篇
  1981年   1198篇
  1980年   1184篇
  1979年   1337篇
  1978年   1241篇
  1977年   1144篇
  1976年   1024篇
  1975年   846篇
  1974年   858篇
  1973年   812篇
  1971年   677篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
This article focuses on counseling research in the community college context. The article suggests the need for a robust community college knowledge base, describes some limitations of the current community college literature, and suggests a framework for more effective work in this area. The authors’ own experiences and selected examples of published studies are used as illustrations of the hurdles encountered and solutions available when examining counseling theories, practices, and outcomes in 2‐year settings.  相似文献   
992.
This paper demonstrates the application of module arithmetic for controlling the level of information security by a new technique referred as integer splitting. The basic definitions and concepts of the method are provided. The mathematical function of arising transformation is described in detail; its properties were studied and the basic theorems were proven that justify the use of splitting in practical applications. An active system was designed and characteristic cases of its operation are considered.  相似文献   
993.
994.
995.
At the University of Maine, middle and high school teachers observed more than 250 university science, technology, engineering, and mathematics classes and collected information on the nature of instruction, including how clickers were being used. Comparisons of classes taught with (n = 80) and without (n = 184) clickers show that, while instructional behaviors differ, the use of clickers alone does not significantly impact the time instructors spend lecturing. One possible explanation stems from the observation of three distinct modes of clicker use: peer discussion, in which students had the opportunity to talk with one another during clicker questions; individual thinking, in which no peer discussion was observed; and alternative collaboration, in which students had time for discussion, but it was not paired with clicker questions. Investigation of these modes revealed differences in the range of behaviors, the amount of time instructors lecture, and how challenging the clicker questions were to answer. Because instructors can vary their instructional style from one clicker question to the next, we also explored differences in how individual instructors incorporated peer discussion during clicker questions. These findings provide new insights into the range of clicker implementation at a campus-wide level and how such findings can be used to inform targeted professional development for faculty.  相似文献   
996.
997.
998.
999.
1000.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号