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   20860篇
  免费   1383篇
各国政治   684篇
工人农民   816篇
世界政治   1442篇
外交国际关系   590篇
法律   14582篇
中国共产党   35篇
中国政治   201篇
政治理论   3682篇
综合类   211篇
  2021年   103篇
  2020年   449篇
  2019年   448篇
  2018年   573篇
  2017年   656篇
  2016年   711篇
  2015年   604篇
  2014年   597篇
  2013年   1946篇
  2012年   490篇
  2011年   609篇
  2010年   701篇
  2009年   723篇
  2008年   579篇
  2007年   577篇
  2006年   662篇
  2005年   530篇
  2004年   500篇
  2003年   447篇
  2002年   429篇
  2001年   725篇
  2000年   639篇
  1999年   516篇
  1998年   292篇
  1997年   236篇
  1996年   238篇
  1995年   235篇
  1994年   257篇
  1993年   229篇
  1992年   384篇
  1991年   442篇
  1990年   395篇
  1989年   402篇
  1988年   409篇
  1987年   361篇
  1986年   392篇
  1985年   392篇
  1984年   365篇
  1983年   320篇
  1982年   240篇
  1981年   240篇
  1980年   215篇
  1979年   236篇
  1978年   174篇
  1977年   144篇
  1976年   129篇
  1975年   130篇
  1974年   138篇
  1973年   138篇
  1971年   100篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
861.
862.
863.
864.
865.
866.
867.
Third World cities are characterized by weak administrative and managerial capacity for environmental planning. Benin City, Nigeria, is no exception. Benin's environmental problems result largely from its unplanned land use and weak development control. These problems include lack of open space, substandard housing and an increasing volume of refuse. The administrative arrangements to handle environmental problems include the Town Planning Division, which enforces building and housing codes and land use regulations; and the Task Force on Environmental Sanitation, responsible for solid waste management. However, these arrangements have not produced satisfactory results. Failure has been due partly to the ad hoc organization of environmental administration; the overlapping perception of environmental problems; the alienation of the public; dispersal of authority; and the scale of jurisdictional units. Effective environmental planning administration must adopt a holistic approach, which recognizes the need for a comprehensive environmental planning and a concentration of environmental authority. This is based on the premise that environmental issues are the responsibility of one agency but an obligation for all. Structurally, the concentration of environmental authority hinges on the principle of cooperative leadership by the Federal Government. This calls urgently for the establishment of a Federal Environmental Protection Agency at the centre, and Environmental Management Boards at state levels. The Boards would provide an administrative umbrella under which the management of various aspects of the environment are coordinated. In order to maximize the cooperation of the public, the traditional power structure of the Oba (paramount chiefs and community leaders) must be involved in the conception and implementation of environmental planning. Citizen participation would in turn be maximized if the neighbourhood is adopted as the jurisdictional unit, upon which environmental administration and management are systematically built.  相似文献   
868.
The transfer of technology to the Third World is often accompanied by a mystique that inhibits the solution of problems faced by the rural poor. An important innovation in medical technology-the so-called ‘Jaipur foot’–illustrates what can be done in the way of rehabilitation work that uses culturally suitable technology and local craftsmen. The experiment required a special mix of organizational and technological inputs. Innovative design was combined with the mobilization of indigenous craftsmanship and the involvement of a voluntary organization. Community support has strengthened the acceptability of technology. Relations between medical personnel and craftsmen benefited the contribution made by both sides. The advantage of local craftsmen over trained limb-makers became apparent. The voluntary body helped the project to avoid bureaucratic obstacles. The very success of the project, however, has produced its own problems, and crucial decisions have to be made about the future of this kind of strategy for a more appropriate technology.  相似文献   
869.
870.
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