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   74853篇
  免费   3330篇
各国政治   4599篇
工人农民   3062篇
世界政治   6657篇
外交国际关系   3918篇
法律   36935篇
中国共产党   11篇
中国政治   769篇
政治理论   21282篇
综合类   950篇
  2021年   436篇
  2020年   1195篇
  2019年   1542篇
  2018年   1790篇
  2017年   2108篇
  2016年   2254篇
  2015年   1866篇
  2014年   2150篇
  2013年   10697篇
  2012年   1811篇
  2011年   1940篇
  2010年   1925篇
  2009年   2121篇
  2008年   1936篇
  2007年   1936篇
  2006年   2060篇
  2005年   1956篇
  2004年   1842篇
  2003年   1693篇
  2002年   1686篇
  2001年   2058篇
  2000年   1751篇
  1999年   1518篇
  1998年   1212篇
  1997年   1061篇
  1996年   1017篇
  1995年   980篇
  1994年   1020篇
  1993年   1019篇
  1992年   1138篇
  1991年   1183篇
  1990年   1096篇
  1989年   1145篇
  1988年   1109篇
  1987年   1126篇
  1986年   1134篇
  1985年   1159篇
  1984年   1047篇
  1983年   1109篇
  1982年   957篇
  1981年   909篇
  1980年   721篇
  1979年   805篇
  1978年   638篇
  1977年   581篇
  1976年   543篇
  1975年   462篇
  1974年   466篇
  1973年   460篇
  1972年   408篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
401.
Family courts and child welfare agencies across the country are charged with protecting the safety of our children. That mission has become more challenging with increasing federal legislation and decreasing funding. In Buffalo, N.Y., the Family Court and the Department of Social Services have teamed up to respond to this challenge. With minimal additional staffing and resources, they have led a collaboration of agencies and service providers to change the way business is done in child welfare. By engaging each other in an interagency system change effort, the amount of time children spend in foster care has been reduced. The collaboration has been able to accomplish in a relatively short time what no agency had previously been able to accomplish on its own. The beneficiaries have been the children and families of Erie County.  相似文献   
402.
403.
In the wake of the 1990 amendments to the Clean Air Act, localities across the United States initiated public information campaigns both to raise awareness of threats to air quality and to change behavior related to air pollution by recommending specific behavioral changes in the campaign messages. These campaigns are designed to reduce the health hazards associated with poor air quality and to avoid federal sanctions resulting from the failure to meet air quality standards. As in many other communities across the country, a coalition of government agencies and businesses initiated a public information campaign in the Atlanta metropolitan region to reduce certain targeted behaviors, mainly driving. A two‐stage model used to analyze data from a rolling sample survey shows that the centerpiece of the information campaign—air quality alerts—was effective in raising awareness and reducing driving in a segment of the population. When the overall information campaign was moderated by employers' participation in programs to improve air quality, drivers significantly reduced the number of miles they drove and the number of trips they took by car on days when air quality alerts were sounded. Public information campaigns can be successful in increasing awareness, but changing well‐established behaviors, such as driving, is likely to require institutional mediation to provide social contexts that support the behavioral change, as well. © 2003 by the Association for Public Policy Analysis and Management.  相似文献   
404.
405.
406.
407.
408.
409.
410.
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