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   25417篇
  免费   750篇
  国内免费   15篇
教育   18909篇
科学研究   2030篇
各国文化   306篇
体育   1917篇
综合类   13篇
文化理论   181篇
信息传播   2826篇
  2022年   170篇
  2021年   291篇
  2020年   428篇
  2019年   696篇
  2018年   925篇
  2017年   926篇
  2016年   785篇
  2015年   556篇
  2014年   790篇
  2013年   5279篇
  2012年   757篇
  2011年   781篇
  2010年   608篇
  2009年   598篇
  2008年   671篇
  2007年   562篇
  2006年   497篇
  2005年   474篇
  2004年   431篇
  2003年   384篇
  2002年   367篇
  2001年   504篇
  2000年   424篇
  1999年   392篇
  1998年   224篇
  1997年   226篇
  1996年   268篇
  1995年   263篇
  1994年   196篇
  1993年   218篇
  1992年   341篇
  1991年   314篇
  1990年   327篇
  1989年   309篇
  1988年   268篇
  1987年   314篇
  1986年   275篇
  1985年   316篇
  1984年   253篇
  1983年   220篇
  1982年   199篇
  1981年   166篇
  1980年   155篇
  1979年   259篇
  1978年   186篇
  1977年   169篇
  1976年   153篇
  1975年   142篇
  1974年   149篇
  1971年   141篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
32.
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   
33.
34.
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   
35.
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   
36.
37.
38.
39.
40.
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