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   20321篇
  免费   589篇
各国政治   899篇
工人农民   758篇
世界政治   1718篇
外交国际关系   827篇
法律   11542篇
中国共产党   4篇
中国政治   113篇
政治理论   4836篇
综合类   213篇
  2021年   112篇
  2020年   249篇
  2019年   310篇
  2018年   418篇
  2017年   493篇
  2016年   513篇
  2015年   354篇
  2014年   419篇
  2013年   2195篇
  2012年   474篇
  2011年   519篇
  2010年   426篇
  2009年   484篇
  2008年   542篇
  2007年   542篇
  2006年   539篇
  2005年   496篇
  2004年   485篇
  2003年   507篇
  2002年   482篇
  2001年   753篇
  2000年   681篇
  1999年   567篇
  1998年   340篇
  1997年   298篇
  1996年   237篇
  1995年   252篇
  1994年   296篇
  1993年   263篇
  1992年   374篇
  1991年   416篇
  1990年   358篇
  1989年   392篇
  1988年   338篇
  1987年   362篇
  1986年   369篇
  1985年   370篇
  1984年   313篇
  1983年   357篇
  1982年   292篇
  1981年   283篇
  1980年   212篇
  1979年   279篇
  1978年   195篇
  1977年   162篇
  1976年   161篇
  1975年   135篇
  1974年   157篇
  1973年   139篇
  1972年   127篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
151.
The present study drew on four competing theoretical perspectives to examine the relationship between family structure and juvenile delinquency. Using data from the Add Health Study, the authors examined nonserious and serious delinquent behavior across youth from different types of households and also considered how the association between family structure and delinquency might be conditioned by family processes and economic factors. Results from negative binomial regression analyses indicated that, in general, type of household was not a significant predictor of nonserious or serious delinquency. Rather, maternal attachment emerged as the most important determinant of delinquent behavior among youth from all family types. The results are discussed within the context of Hirschi's original interpretation of social control theory and future directions for research are suggested.  相似文献   
152.
153.
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   
154.
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   
155.
156.
157.
158.
This paper applies the poliheuristic theory of foreign policy decision making to non-democratic states. Poliheuristic theory asserts that state leaders assign primary importance to their political survival; however, the meaning of "the political" varies dramatically from country to country. Furthermore, the types of actors who hold leaders politically accountable also vary between countries. Consequently, leaders often pursue vastly different means of ensuring their political survival. The author uses the common distinction between single-party, military, and personalist autocracies to show that apparently arbitrary differences in autocratic leaders' political concerns actually vary in systematic and potentially predictable ways. Because this argument is generalized to non-democratic states as a whole, it has important implications for the ways in which democratic states craft their policies toward autocracies.  相似文献   
159.
160.
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