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   122823篇
  免费   1609篇
  国内免费   234篇
教育   85416篇
科学研究   13458篇
各国文化   1991篇
体育   9343篇
综合类   171篇
文化理论   1083篇
信息传播   13204篇
  2021年   950篇
  2020年   1697篇
  2019年   2623篇
  2018年   3108篇
  2017年   3388篇
  2016年   3421篇
  2015年   2340篇
  2014年   3232篇
  2013年   27392篇
  2012年   2387篇
  2011年   2700篇
  2010年   2349篇
  2009年   2622篇
  2008年   2376篇
  2007年   2087篇
  2006年   2322篇
  2005年   2302篇
  2004年   2998篇
  2003年   2329篇
  2002年   2136篇
  2001年   2002篇
  2000年   1688篇
  1999年   1533篇
  1998年   1460篇
  1997年   1518篇
  1996年   1697篇
  1995年   1469篇
  1994年   1460篇
  1993年   1469篇
  1992年   1483篇
  1991年   1398篇
  1990年   1394篇
  1989年   1316篇
  1988年   1173篇
  1987年   1106篇
  1986年   1128篇
  1985年   1397篇
  1984年   1274篇
  1983年   1271篇
  1982年   1248篇
  1981年   1167篇
  1980年   1164篇
  1979年   1215篇
  1978年   1195篇
  1977年   1106篇
  1976年   1001篇
  1975年   797篇
  1974年   799篇
  1973年   767篇
  1971年   622篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
151.
This article is a preliminary analysis of the first few years of the Computer Matching and Privacy Protection Act of 1988 (CMPPA). The act requires Federal agencies to establish Data Integrity Boards (DIBs) with responsibility to approve written agreements for computer matches in which their agencies are involved. Information for this analysis was collected from the annual reports on computer matching submitted by agencies to the Office of Management and Budget (OMB) for 1990 and 1991 and from 108 matching agreements. The secretaries of several DIBs were also interviewed. The effectiveness of DIBs and matching agreements are analyzed using McCubbins and Schwartz's distinction between “police-patrol” and “fire- alarm” oversight. The article concludes that more active and direct oversight, which would occur through an independent data protection or privacy board, is necessary.  相似文献   
152.
New World Writing, a magazine founded by New American Library in 1952, quickly became an important vehicle for liberal intellectual and literary thought. In addition to providing an outlet for new writing, the magazine became an important acquisitions tool for NAL. Throughout its lifetime, New World Writing remained a showcase for many of the finest writers of the 1950s, including Christopher Isherwood, Louis Auchincloss, Tennessee Williams, Flannery O’Connor, Jack Kerouac, and Gore Vidal. He is the author of Under Cover: An Illustrated History of American Mass Market Paperbacksand Heavy Traffic and High Culture: The New American Library as Literary Gatekeeper. He is working on a study of American literary agents  相似文献   
153.
对中、古等世界女子排球强队二传组织进攻特点分析   总被引:4,自引:0,他引:4  
就中国女子排球队在 1999年世界杯赛和第 2 7届奥运会上对古巴、俄罗斯、巴西 3队的 3场比赛的二传分布 ,分析了当前世界强队主二传与全队进攻战术的组成特点 ,提出了全面认识和加强对二传手培养的重要性。  相似文献   
154.
Students who are deaf or hard of hearing (SDHH) often use test accommodations when they participate in large-scale, standardized assessments. The purpose of this article is to present findings from the Third Annual Survey of Assessment and Accommodations for Students who are Deaf or Hard of Hearing. The "big five" accommodations were reported by at least two-thirds of the 389 participants: extended time, small group/individual administration, test directions interpreted, test items read aloud, and test items interpreted. In a regression analysis, language used in instruction showed the most significant effects on accommodations use. The article considers these findings in light of a more proactive role for the National Survey in providing evidence for the effectiveness of accommodations with SDHH.  相似文献   
155.
This study describes response to intervention (RTI) screening and progress‐monitoring instruments and procedures in 41 local school settings. For screening the schools most often used published reading assessments or commercial products; a three‐times‐per‐year screening schedule was most prevalent. For progress monitoring schools most often relied on published reading assessments; a weekly progress monitoring schedule was most prevalent. The variability between local school practices is discussed with regard to efficiency, equity, and viability of RTI.  相似文献   
156.
157.
The validity and reliability of curriculum‐based measures in reading as indicators of performance and progress for secondary‐school students were examined. Thirty‐five grade 8 students completed reading aloud and maze‐selection measures weekly for 10 weeks. Criterion measures were the state standards test in reading and the Woodcock–Johnson III Test of Achievement. Different time frames for each measure were compared. Most alternate‐form reliability coefficients were above .80. Criterion‐related validity coefficients ranged from .77 to .89. No differences related to time were found. Only maze selection reflected significant growth, with an average increase of 1.29 correct choices per week. Maze growth was related to the reading performance level and to change on the Woodcock–Johnson III from pre‐ to posttest.  相似文献   
158.
S. Ramasesha 《Resonance》2009,14(8):782-798
Efficient lighting and display have become important concerns in the energy-starved modern world. This has led to new paradigms in lighting and display technologies. Organic molecules provide a new class of active materials for such technologies. This article gives the basic science behind the design of such molecular materials used in displays and lighting.  相似文献   
159.
160.
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