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   25098篇
  免费   782篇
  国内免费   5篇
各国政治   1011篇
工人农民   1042篇
世界政治   1698篇
外交国际关系   806篇
法律   15874篇
中国共产党   6篇
中国政治   195篇
政治理论   5008篇
综合类   245篇
  2020年   306篇
  2019年   391篇
  2018年   483篇
  2017年   575篇
  2016年   576篇
  2015年   431篇
  2014年   452篇
  2013年   2287篇
  2012年   625篇
  2011年   696篇
  2010年   561篇
  2009年   628篇
  2008年   704篇
  2007年   760篇
  2006年   710篇
  2005年   673篇
  2004年   645篇
  2003年   676篇
  2002年   607篇
  2001年   982篇
  2000年   825篇
  1999年   704篇
  1998年   377篇
  1997年   270篇
  1996年   321篇
  1995年   292篇
  1994年   318篇
  1993年   312篇
  1992年   512篇
  1991年   555篇
  1990年   538篇
  1989年   486篇
  1988年   510篇
  1987年   457篇
  1986年   520篇
  1985年   500篇
  1984年   421篇
  1983年   405篇
  1982年   310篇
  1981年   302篇
  1980年   231篇
  1979年   301篇
  1978年   205篇
  1977年   201篇
  1976年   183篇
  1975年   184篇
  1974年   212篇
  1973年   175篇
  1972年   166篇
  1969年   149篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
221.
Postmortem examination of a former professional basketball player revealed an abnormal heart, most notably a single coronary artery. The literature on single coronary arteries is briefly reviewed, and the possible mechanism which caused the patient's condition is considered. This case is particularly unusual because of the patient's profession, which is so physically demanding.  相似文献   
222.
The fingernail ridge patterns of a pair of identical twins were compared to each other, their parents, and an unrelated subject. The patterns of the twins' nails showed regions of strong similarity but were distinguishable from one another. Fewer similarities were found when comparing the nails to those of the parents and the unrelated control. The twins were shown to be monozygotic by means of DNA profiling. This therefore represents the first demonstration of unique fingernail ridge patterns in subjects shown conclusively to be identical twins. When the fingernail ridge patterns were examined with a scanning electron microscope, the backscattered electron (BEI) images were found to have superior contrast when compared to the secondary electron (SEI) images.  相似文献   
223.
This article explores theoretical and empirical issues in the application of clinical neuropsychological evidence to forensic issues in the criminal law. The nature of forensic neuropsychological evaluations is discussed with reference to issues of competency to stand trial, criminal responsibility, and other competencies in the criminal process. Examples of specific disorders relevant to criminal law standards are presented, together with data estimating the prevalence of brain dysfunction in criminal and forensic populations. Research is also reviewed on the role of neuropsychological brain dysfunction in the etiology of violence and criminally relevant behavior. Finally, empirical and ethical issues concerning the applicability and admissibility of forensic neuropsychological data in the criminal context are discussed.  相似文献   
224.
225.
226.
227.
Using merged administrative data from welfare reform evaluations in three states, we estimate the effects of child care subsidy use on the length of time it takes for a welfare applicant to move into substantial employment. Findings show that the use of a child care subsidy during an unemployed or marginally employed spell of welfare receipt is associated with between a 0.6 and 1.7 quarter (or 11% to 34%) reduction in the time to substantial employment in two of the three state samples. The positive influence of subsidy use on transitions to substantial employment is strongest for those welfare applicants with the lowest earnings who are mixing welfare and work prior to subsidy receipt.  相似文献   
228.
229.
Law and Philosophy -  相似文献   
230.
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