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   13075篇
  免费   373篇
各国政治   842篇
工人农民   485篇
世界政治   1031篇
外交国际关系   694篇
法律   6899篇
中国政治   88篇
政治理论   3292篇
综合类   117篇
  2021年   82篇
  2020年   173篇
  2019年   231篇
  2018年   275篇
  2017年   332篇
  2016年   341篇
  2015年   217篇
  2014年   299篇
  2013年   1776篇
  2012年   315篇
  2011年   318篇
  2010年   315篇
  2009年   320篇
  2008年   324篇
  2007年   393篇
  2006年   373篇
  2005年   373篇
  2004年   367篇
  2003年   370篇
  2002年   349篇
  2001年   392篇
  2000年   344篇
  1999年   319篇
  1998年   182篇
  1997年   166篇
  1996年   158篇
  1995年   150篇
  1994年   165篇
  1993年   141篇
  1992年   201篇
  1991年   242篇
  1990年   215篇
  1989年   207篇
  1988年   211篇
  1987年   229篇
  1986年   225篇
  1985年   210篇
  1984年   182篇
  1983年   184篇
  1982年   128篇
  1981年   146篇
  1980年   105篇
  1979年   156篇
  1978年   116篇
  1977年   105篇
  1976年   84篇
  1975年   95篇
  1974年   101篇
  1973年   93篇
  1972年   70篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
111.
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   
112.
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   
113.
114.
115.
Little literature has been developed to describe the process of transferring a corporation's technology between international units of that company for ultimate transfer to their external customers (Kimberly 1981 and Leonard-Barton and Sinha 1993). This paper addresses the issues at Air Products and Chemicals, Inc. involved in the transfer of applications technology. Technology is transferred from the unit of the corporation which develops the technology to international affiliates and subsidiaries. The ultimate goal is the support of product sales to the external industrial customer. A strategy for this type of organization is described which is supported by references to theoretical constructs in the literature and empirical observations from the organization itself.  相似文献   
116.
117.
118.
119.
120.
Although past research has developed scales for the incidence, prevalence, and fear of student-on-student victimization (SSV), little is known about the scaling of perceived risk (i.e., the cognitive appraisal of the chances of experiencing SSV). Hence, this study examined self-report survey data for the perceived risk of SSV as measured in the Adolescent Index for School Safety (AISS). Children in grades 7 through 10 (n=337) in a single Florida public school completed the AISS. Factor analyses using Maximum Likelihood Estimation with Oblimin Rotation identified nine unique factors for perceived risk. Reliability analyses found standardized Cronbach Alphas that ranged from .64 to .91, and seven out of the nine identified scales were above .80, which suggested good to excellent internal consistency. Future research should examine the content validity, construct validity, and predictive validity for the AISS and other self-report surveys of SSV dynamics. This publication was made possible by a grant [#97-MU-FX-KO12 (S-l)] from the Office of Juvenile Justice and Delinquency Prevention (O.J.J.D.P.), United States Department of Justice (U.S.D.O.J.). This grant is administered through the Hamilton Fish National Institute on School and Community Violence at George Washington University. This specific study was developed and implemented by staff at: 1) East Carolina University’s Department of Criminal Justice; and 2) Florida State University’s Center for Educational Research and Policy Studies. All points of view and opinions in this paper are those of the authors and do not necessarily represent the official position or policies of East Carolina University, Florida State University, the Hamilton Fish National Institute on School and Community Violence, the O.J.J.D.P., or the U.S.D.OJ. The authors would also like to thank Dr. Bill Doerner and Jennifer Jolley for their support, editorial feedback, and insightful comments regarding earlier drafts of this paper.  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