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   74449篇
  免费   3369篇
各国政治   4825篇
工人农民   3060篇
世界政治   6453篇
外交国际关系   4102篇
法律   35787篇
中国共产党   13篇
中国政治   787篇
政治理论   21835篇
综合类   956篇
  2021年   456篇
  2020年   1239篇
  2019年   1606篇
  2018年   1846篇
  2017年   2141篇
  2016年   2356篇
  2015年   1928篇
  2014年   2188篇
  2013年   11079篇
  2012年   1808篇
  2011年   1928篇
  2010年   1950篇
  2009年   2201篇
  2008年   1983篇
  2007年   1989篇
  2006年   2112篇
  2005年   1991篇
  2004年   1865篇
  2003年   1630篇
  2002年   1718篇
  2001年   1890篇
  2000年   1646篇
  1999年   1439篇
  1998年   1189篇
  1997年   1039篇
  1996年   1021篇
  1995年   1000篇
  1994年   985篇
  1993年   1012篇
  1992年   1073篇
  1991年   1106篇
  1990年   1039篇
  1989年   1068篇
  1988年   1066篇
  1987年   1061篇
  1986年   1093篇
  1985年   1119篇
  1984年   1008篇
  1983年   1026篇
  1982年   924篇
  1981年   864篇
  1980年   689篇
  1979年   755篇
  1978年   611篇
  1977年   546篇
  1976年   499篇
  1975年   426篇
  1974年   457篇
  1973年   444篇
  1972年   382篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
791.
792.
All records from the Danish Medicolegal Council concerning drivers suspected for drug influences were examined for the 5 year period 1981-1985. 461 records were included, 62 women and 399 men. In 250 cases drugs from more than one of ten groups had been taken thus making 786 combinations of drug/driving. The major drug group was benzodiazepines, accounting for 65% of all drug intake. Opioids also contributed substantially, found in 38% of the cases. A traffic accident had occurred in 180 (39%) of the records. Drivers who had been taking antidepressives were involved in an accident in 67%, significantly above the mean. For benzodiazepines, the corresponding percentage was 43%, while for opioids it was only 23%, significantly below the mean. This striking difference has been demonstrated in most of the studies concerning drugs in traffic. It may support the hypothesis that opioids do not necessarily make driving dangerous, as do antidepressives, barbiturates and especially benzodiazepines.  相似文献   
793.
794.
795.
One of the remedies sought by state and local officials for the growing burden of federal mandates is a mandate reimbursement law. A major purpose of mandate reimbursement is to deter Congress from imposing excessive costs on state and local governments by making it fully accountable for its actions. The paper begins by extending the economic theory of grants to mandates and reimbursed mandates. It goes on to assess the benefits and costs of mandate reimbursement, and to distinguish mandates that should be reimbursed, should a reimbursement program prove desirable, from those that should not. Then, using the economic theory of grants and mandates, the paper compares reimbursed mandates with two alternatives for accomplishing the same objective, compensating grants and procedural rules. It concludes that the latter are more promising than mandate reimbursement.  相似文献   
796.
797.
798.
799.
800.
In 1990, the state of California passed the pioneering mandate on zero emission vehicles (ZEV). This technology‐forcing regulation is aimed at improvement of air quality and protection of public health from the adverse effects of air pollutants from automobiles. Facing severe opposition from the auto industry, the mandate has been revised a number of times, most recently in 2003, whereby the requirement for ZEVs have been made to align with the pace of technology development. Review of strategies used in implementation of the mandate has revealed greater emphasis on the economic incentives for rather than on environmental merits of ZEVs. Using prospect theory as the framework for analysis, the reasons have been explored. The findings of the study help us to understand how decisions are made with respect with to deviations from a mental anchor point and through the process of evaluation of losses and gains.  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