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   71550篇
  免费   3284篇
各国政治   4521篇
工人农民   2992篇
世界政治   6151篇
外交国际关系   3866篇
法律   34709篇
中国共产党   11篇
中国政治   759篇
政治理论   20886篇
综合类   939篇
  2021年   411篇
  2020年   1176篇
  2019年   1532篇
  2018年   1737篇
  2017年   2033篇
  2016年   2234篇
  2015年   1854篇
  2014年   2111篇
  2013年   10555篇
  2012年   1719篇
  2011年   1826篇
  2010年   1874篇
  2009年   2105篇
  2008年   1853篇
  2007年   1868篇
  2006年   2029篇
  2005年   1897篇
  2004年   1777篇
  2003年   1548篇
  2002年   1634篇
  2001年   1828篇
  2000年   1584篇
  1999年   1383篇
  1998年   1144篇
  1997年   994篇
  1996年   992篇
  1995年   954篇
  1994年   955篇
  1993年   980篇
  1992年   1053篇
  1991年   1079篇
  1990年   1025篇
  1989年   1043篇
  1988年   1048篇
  1987年   1039篇
  1986年   1072篇
  1985年   1115篇
  1984年   990篇
  1983年   1007篇
  1982年   904篇
  1981年   853篇
  1980年   674篇
  1979年   744篇
  1978年   600篇
  1977年   537篇
  1976年   489篇
  1975年   422篇
  1974年   447篇
  1973年   439篇
  1972年   382篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
751.
752.
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   
753.
754.
755.
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   
756.
757.
758.
759.
760.
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