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   17464篇
  免费   1232篇
各国政治   720篇
工人农民   834篇
世界政治   1138篇
外交国际关系   532篇
法律   12253篇
中国共产党   2篇
中国政治   104篇
政治理论   3024篇
综合类   89篇
  2023年   76篇
  2021年   86篇
  2020年   428篇
  2019年   446篇
  2018年   568篇
  2017年   579篇
  2016年   660篇
  2015年   505篇
  2014年   536篇
  2013年   1803篇
  2012年   485篇
  2011年   505篇
  2010年   537篇
  2009年   559篇
  2008年   509篇
  2007年   508篇
  2006年   521篇
  2005年   436篇
  2004年   431篇
  2003年   360篇
  2002年   409篇
  2001年   678篇
  2000年   611篇
  1999年   485篇
  1998年   244篇
  1997年   185篇
  1996年   194篇
  1995年   191篇
  1994年   172篇
  1993年   178篇
  1992年   306篇
  1991年   314篇
  1990年   297篇
  1989年   280篇
  1988年   310篇
  1987年   264篇
  1986年   325篇
  1985年   319篇
  1984年   251篇
  1983年   229篇
  1982年   178篇
  1981年   155篇
  1980年   143篇
  1979年   219篇
  1978年   116篇
  1977年   93篇
  1975年   96篇
  1974年   124篇
  1973年   80篇
  1972年   78篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
871.
User charges, which have become an important revenue enhancement device during the 1980s, have also raised a variety of counter-charges. This study examines three new mandatory Customs Service fees—for processing passengers, conveyances, and merchandise entering the United States and for special services at small airports—along with their differences and changes over time (in rate structure, exemptions, dedicated accounts, and disposition of funds). Despite support for the charges, opposition to some has arisen because of their cost to the private sector, violation of certain assumptions behind user fees, competing international obligations and policies, rival institutional interests and powers of Congress and the presidency, and changing fiscal conditions.  相似文献   
872.
873.
874.
875.
876.
877.
878.
879.
Eighty college males were given an expanded identity status interview which included two new interpersonal-sexual areas, “attitudes towards sexual expression” and “sex-role beliefs.” The relative contribution of the new content areas as well as of the standard three areas (occupation, religion, and politics) to overall identity status was assessed by noting the extent of correspondence. Identity status in each content area was also compared with performance on the dependent variable of cognitive complexity. Ideology contributed more than occupation both to overall status rating, as well as to discrimination on the dependent variable. Results on the two new areas supported the view that interpersonal-sexual concerns are important for men's identity development as well as for women's. The finding that all interview areas corresponded well with overall identity status and discriminated significantly on the dependent measure leads to the suggestion that the process variables of crisis and commitment may so overshadow a particular content area that any content of personal relevance for the late adolescent might be used in investigating ego identity development.  相似文献   
880.
To investigate the incidence and correlates of bulimic behavior, 1268 high school females were surveyed. A 47-item questionnaire was used to identify a group of students that would meet the DSM-III criteria for a probable diagnosis of bulimia. Students were then compared across the four content areas of demographics; body perception and weight information; dieting, exercise and menstrual behavior; and frequency of bingeing and purging behavior. Results indicated that 4.9% of the students met rigorous criteria for the diagnosis of bulimia. Between-group comparisons indicated that body dissatisfaction, drive for thinness, and chronicity of dieting differentiated the two groups.This work was supported by Biomedical Research Grant #RR5476, the Sears Allstate Foundation, and the George and Tina Barr Foundation.Main interest is eating disorders.  相似文献   
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