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   31912篇
  免费   1413篇
各国政治   1244篇
工人农民   2008篇
世界政治   1737篇
外交国际关系   1034篇
法律   20714篇
中国共产党   5篇
中国政治   153篇
政治理论   6266篇
综合类   164篇
  2021年   121篇
  2020年   501篇
  2019年   548篇
  2018年   1863篇
  2017年   1826篇
  2016年   1734篇
  2015年   665篇
  2014年   664篇
  2013年   2605篇
  2012年   819篇
  2011年   1511篇
  2010年   1587篇
  2009年   1226篇
  2008年   1362篇
  2007年   1295篇
  2006年   735篇
  2005年   683篇
  2004年   783篇
  2003年   650篇
  2002年   610篇
  2001年   859篇
  2000年   799篇
  1999年   632篇
  1998年   353篇
  1997年   282篇
  1996年   302篇
  1995年   298篇
  1994年   272篇
  1993年   274篇
  1992年   442篇
  1991年   469篇
  1990年   442篇
  1989年   435篇
  1988年   446篇
  1987年   423篇
  1986年   464篇
  1985年   453篇
  1984年   391篇
  1983年   373篇
  1982年   270篇
  1981年   237篇
  1980年   210篇
  1979年   320篇
  1978年   195篇
  1977年   164篇
  1976年   129篇
  1975年   149篇
  1974年   175篇
  1973年   142篇
  1972年   130篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
961.
962.
963.
964.
965.
966.
967.
968.
Responsibility for the social safety net continues to “devolve” from the federal to state governments, and many states are now confronting the dilemmas inherent in redesigning welfare—dilemmas that faced Congress, too, as it sought to impose new conditions on receipt of public assistance. This article argues that reforming AFDC is difficult because the public has conflicting goals: putting welfare recipients to work; protecting their children from severe poverty; and controlling costs. For 25 years, reformers have viewed requiring welfare recipients to participate in work-promoting programs as uniquely able to balance these goals. Numerous studies have shown that this approach modestly increased employment and reduced welfare costs. More substantial gains have been achieved by some “mixed-strategy” programs, which stress immediate job entry for some recipients and employment-directed education or training for others. Many people remain on the rolls, however, prompting some policymakers to argue for substituting work-for-benefits or community service work (“workfare”) for welfare after a certain period of time, and others for ending all support. The limited knowledge about work-for-benefits programs suggests that, in contrast to work-promoting activities, this approach ultimately costs money. The research record confirms that there are no easy answers in welfare reform, and that states will have to weigh the trade-offs in considering alternative strategies.  相似文献   
969.
970.
Schools across the country are ending the practice of grouping students based on ability, in part, because of research indicating that tracking hurts low-ability students without helping students of other ability levels. Using a nationally representative survey conducted by the National Center for Education Statistics, (NCES) we reexamine the impact of tracking on high school student achievement through the estimation of a standard education production function. This approach allows us to control for the possibility that track is correlated with factors such as class size and teacher education. In addition, we address the possibility that there are unobserved student or school characteristics that affect both achievement and track placement. Our results indicate that abolishing tracking in America's schools would have a large positive impact on achievement for students currently in the lower tracks, but that this increase in achievement would come at the expense of students in upper-track classes.  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