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   44884篇
  免费   648篇
  国内免费   147篇
教育   31438篇
科学研究   4913篇
各国文化   408篇
体育   3639篇
综合类   28篇
文化理论   444篇
信息传播   4809篇
  2022年   263篇
  2021年   393篇
  2020年   645篇
  2019年   990篇
  2018年   1802篇
  2017年   1787篇
  2016年   1534篇
  2015年   778篇
  2014年   1080篇
  2013年   8122篇
  2012年   1080篇
  2011年   1279篇
  2010年   1013篇
  2009年   919篇
  2008年   1020篇
  2007年   1079篇
  2006年   793篇
  2005年   823篇
  2004年   787篇
  2003年   767篇
  2002年   677篇
  2001年   783篇
  2000年   731篇
  1999年   688篇
  1998年   386篇
  1997年   399篇
  1996年   496篇
  1995年   445篇
  1994年   371篇
  1993年   391篇
  1992年   603篇
  1991年   591篇
  1990年   596篇
  1989年   566篇
  1988年   473篇
  1987年   528篇
  1986年   502篇
  1985年   564篇
  1984年   480篇
  1983年   465篇
  1982年   384篇
  1981年   364篇
  1980年   318篇
  1979年   536篇
  1978年   404篇
  1977年   362篇
  1976年   332篇
  1975年   286篇
  1974年   314篇
  1973年   265篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
92.
93.
94.
95.
PUBLIC AND ELITE ATTITUDES TO ENVIRONMENTAL ISSUES   总被引:1,自引:0,他引:1  
This paper puts the environment into perspective. Politiciansand commentators see the environment as yesterday's issue, forgettingthat the core of environmental activists is still double thelevel of just five years ago. International comparisons stretchingfrom Poland to New Zealand are made, examining the public'senvironmental behavior, attitudes and values. Using Great Britainas a case study, detailed comparisons are made between the attitudesof the general public with journalists, the financial community,captains of industry, and Members of Parliament and the latterthen compared with Members of the European Parliament. The publicis demanding action by companies and by governments on environmentalissues and has little faith in either to take corrective action.  相似文献   
96.
97.
The purpose of this investigation was to describe the morphological parameters that characterize elite age group divers. Comparisons are made to normative age group data from the Coquitlam Growth Study and the constancy of important characteristics from age group to age group is examined. Data were collected on 27 male and 28 female elite divers who participated in the 1990 North American Age Group Diving Championships. Body build, body composition and skinfold corrected diameters were determined from 36 anthropometric parameters and analysed by ANOVA, t-test and Phantom z-scores procedures. All age groups except the 14- to 15-year-old males were significantly (P < or = 0.05) shorter than their norms but recorded higher androgyny index values. The estimated relative muscle mass increased significantly (P < or = 0.05) with age for males at all ages (40.8-46.3%). The 16- to 18-year-old females had a significantly (P < or = 0.05) larger relative muscle component compared to the younger age groups (40.1-38.4%). When normalized for height, active tissue development of the extremities was comparable between the sexes except in the forearm. The results indicate that at all age levels short stature is an important characteristic for divers. Analysis of regional active tissue development provides further insight into sport-specific prerequisites for success at elite levels.  相似文献   
98.
99.
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   
100.
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