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   22458篇
  免费   399篇
  国内免费   15篇
教育   15977篇
科学研究   2032篇
各国文化   222篇
体育   1913篇
综合类   13篇
文化理论   179篇
信息传播   2536篇
  2022年   157篇
  2021年   262篇
  2020年   388篇
  2019年   613篇
  2018年   841篇
  2017年   817篇
  2016年   710篇
  2015年   427篇
  2014年   668篇
  2013年   4460篇
  2012年   642篇
  2011年   649篇
  2010年   475篇
  2009年   487篇
  2008年   540篇
  2007年   482篇
  2006年   432篇
  2005年   412篇
  2004年   370篇
  2003年   359篇
  2002年   342篇
  2001年   478篇
  2000年   396篇
  1999年   359篇
  1998年   203篇
  1997年   198篇
  1996年   208篇
  1995年   219篇
  1994年   163篇
  1993年   181篇
  1992年   295篇
  1991年   272篇
  1990年   284篇
  1989年   278篇
  1988年   239篇
  1987年   285篇
  1986年   252篇
  1985年   290篇
  1984年   236篇
  1983年   198篇
  1982年   173篇
  1981年   155篇
  1980年   134篇
  1979年   242篇
  1978年   173篇
  1977年   152篇
  1976年   137篇
  1975年   131篇
  1974年   133篇
  1971年   119篇
排序方式: 共有10000条查询结果,搜索用时 687 毫秒
31.
32.
33.
34.
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   
35.
36.
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   
37.
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   
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