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   14956篇
  免费   1129篇
各国政治   1032篇
工人农民   589篇
世界政治   1401篇
外交国际关系   628篇
法律   9152篇
中国共产党   2篇
中国政治   100篇
政治理论   3085篇
综合类   96篇
  2023年   79篇
  2021年   152篇
  2020年   332篇
  2019年   503篇
  2018年   476篇
  2017年   582篇
  2016年   598篇
  2015年   468篇
  2014年   522篇
  2013年   2006篇
  2012年   462篇
  2011年   505篇
  2010年   455篇
  2009年   395篇
  2008年   455篇
  2007年   417篇
  2006年   411篇
  2005年   348篇
  2004年   374篇
  2003年   322篇
  2002年   303篇
  2001年   515篇
  2000年   495篇
  1999年   334篇
  1998年   215篇
  1997年   182篇
  1996年   146篇
  1995年   143篇
  1994年   172篇
  1993年   160篇
  1992年   217篇
  1991年   237篇
  1990年   222篇
  1989年   227篇
  1988年   220篇
  1987年   205篇
  1986年   240篇
  1985年   221篇
  1984年   175篇
  1983年   178篇
  1982年   121篇
  1981年   126篇
  1980年   94篇
  1979年   141篇
  1978年   84篇
  1977年   83篇
  1976年   71篇
  1974年   79篇
  1973年   77篇
  1972年   71篇
排序方式: 共有10000条查询结果,搜索用时 250 毫秒
21.
22.
23.
24.
25.
Past research has largely ignored the developmental changes within the child that account for the association between parenting and risk for delinquency. We used structural equation modeling and data from a longitudinal study of several hundred African‐American families to test the contentions of various theories regarding the sociocognitive and emotional factors that mediate the impact of parental behavior on a youth's risk for delinquency. Our findings largely supported the theories. The impact of monitoring/discipline was indirect through low self‐control and acceptance of deviant norms, whereas the effect of hostility/ rejection was indirect through low self‐control, hostile view of relationships, and acceptance of deviant norms. These two dimensions of parenting were no longer related either to affiliation with deviant peers or to conduct problems once the effects of these psychological characteristics were taken into account; the impact of these parenting practices was completely mediated by these four cognitive/affective variables. Contrary to expectation, however, these psychological factors did not mediate any of the relationship between caretaker involvement in antisocial behavior and child conduct problems.  相似文献   
26.
27.
Divorce, although a statistical norm, is a developmental trauma to the children involved. This article looks at the two-camp emotional environment of a divorcing family and its effect on the formation of a child's identity. By examining developmental ages, chosen according to divorce research, the author attempts to show how the interspouse emotional cathexes negatively affect a child's sense of self in ways specific to the child's age at the divorce.  相似文献   
28.
The DNA commission of the International Society of Forensic Genetics (ISFG) was convened at the 21st congress of the International Society for Forensic Genetics held between 13 and 17 September in the Azores, Portugal. The purpose of the group was to agree on guidelines to encourage best practice that can be universally applied to assist with mixture interpretation. In addition the commission was tasked to provide guidance on low copy number (LCN) reporting. Our discussions have highlighted a significant need for continuing education and research into this area. We have attempted to present a consensus from experts but to be practical we do not claim to have conveyed a clear vision in every respect in this difficult subject. For this reason, we propose to allow a period of time for feedback and reflection by the scientific community. Then the DNA commission will meet again to consider further recommendations.  相似文献   
29.
In a case of first impression, the Trademark Trial and AppealBoard of the US Patent and Trademark Office has held that theflavour orange is not registrable for use with quick-dissolvingantidepressant tablets and pills.  相似文献   
30.
This paper links the policy context regarding S&T parks to the objectives and characteristics of the established parks and incubators in a relatively small, converging European country. S&T parks and incubators in Greece during the past decade and a half have gradually shifted in terms of ownership and management from university/research institute to the private sector and in terms of financing from public to private funds, also involving the provision of seed capital and access to venture capital. This gradual shift toward more private engagement has created a variety of models out of which, it is hoped, successful innovative companies will emerge in larger numbers than in the past.
  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