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   36394篇
  免费   504篇
  国内免费   21篇
教育   26148篇
科学研究   3016篇
各国文化   332篇
体育   3277篇
综合类   15篇
文化理论   301篇
信息传播   3830篇
  2021年   332篇
  2020年   511篇
  2019年   791篇
  2018年   1061篇
  2017年   1014篇
  2016年   986篇
  2015年   606篇
  2014年   785篇
  2013年   6800篇
  2012年   759篇
  2011年   885篇
  2010年   636篇
  2009年   646篇
  2008年   786篇
  2007年   679篇
  2006年   698篇
  2005年   540篇
  2004年   560篇
  2003年   473篇
  2002年   535篇
  2001年   722篇
  2000年   749篇
  1999年   657篇
  1998年   377篇
  1997年   391篇
  1996年   465篇
  1995年   402篇
  1994年   387篇
  1993年   374篇
  1992年   534篇
  1991年   537篇
  1990年   516篇
  1989年   564篇
  1988年   535篇
  1987年   499篇
  1986年   507篇
  1985年   556篇
  1984年   463篇
  1983年   499篇
  1982年   404篇
  1981年   386篇
  1980年   391篇
  1979年   541篇
  1978年   412篇
  1977年   381篇
  1976年   326篇
  1975年   295篇
  1974年   287篇
  1973年   288篇
  1971年   261篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
Data from the International Social Survey Program indicate considerablevariation in the desire of respondents for increased spendingon the environment in Australia, Austria, Great Britain, theUnited States, and West Germany. This paper explores this variationwith the following objectives: (1) to determine the extent towhich the social bases of environmental concern are consistentacross nations; (2) to determine how the issue of the environmenthas been politicized in the five industrialized nations, focusingon the association of Old Leftist concerns and environmentalconcern; and (3) to determine the extent to which the socialbases of environmental concern can explain the cross-nationalvariation. The study usesa regression analysis, testing variablesrepresenting the social bases of environmental concern frompast research in the United States, a scale representing commitmentto the platform of the Old Left, and dummy variables for eachcountry. The results show that the social bases of environmentalconcern are the same in the five countries studied, includinga consistent positive association of Old Leftism with environmentalconcern. However, substantial variation between countries inthe overall level of concern remains. Potential sources of theremaining variation are examined.  相似文献   
72.
73.
74.
75.
A case presentation method of group supervision, as practiced at a community college, is described. Developmental principles underlying this approach are presented.  相似文献   
76.
77.
78.
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   
79.
80.
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