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   21113篇
  免费   646篇
各国政治   924篇
工人农民   832篇
世界政治   1728篇
外交国际关系   698篇
法律   12661篇
中国共产党   3篇
中国政治   104篇
政治理论   4605篇
综合类   204篇
  2020年   261篇
  2019年   308篇
  2018年   404篇
  2017年   479篇
  2016年   504篇
  2015年   371篇
  2014年   410篇
  2013年   2124篇
  2012年   518篇
  2011年   528篇
  2010年   433篇
  2009年   469篇
  2008年   553篇
  2007年   575篇
  2006年   554篇
  2005年   494篇
  2004年   500篇
  2003年   516篇
  2002年   478篇
  2001年   795篇
  2000年   741篇
  1999年   604篇
  1998年   344篇
  1997年   291篇
  1996年   244篇
  1995年   253篇
  1994年   287篇
  1993年   262篇
  1992年   415篇
  1991年   436篇
  1990年   412篇
  1989年   417篇
  1988年   389篇
  1987年   405篇
  1986年   418篇
  1985年   425篇
  1984年   354篇
  1983年   387篇
  1982年   305篇
  1981年   278篇
  1980年   220篇
  1979年   291篇
  1978年   209篇
  1977年   173篇
  1976年   162篇
  1975年   158篇
  1974年   190篇
  1973年   168篇
  1972年   145篇
  1970年   122篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
111.
The primary aim of this paper is to review the literature on preadolescent friendships in order to examine the relationship between preadolescent friendships and social support in adulthood. Social supports are important to health, both directly and as a stress buffer. Few studies, however, have specifically examined adult social supports from the perspective of their developmental precursors and critical developmental periods. Some data indicate that the preadolescent period may be of particular importance to the development of adult social skills and ties. Observational and empirical studies of preadolescent peer relationships, and in particular best friendships, suggest unique and critical contributions to adult social relatedness. Present research is suggestive but is insufficient to validate preadolescence as a critical period in adult social relatedness. Our review has implications for better understanding the mechanisms by which preadolescent friendships effect adult social support—an important mediator of the effects of stress on health. Further longitudinal study is needed.Received Ph.D. from University of Maryland. Research interests are social supports and psychological responses to trauma and disaster.Received M.D. from Yale University. Research interests are social supports and traumatic stress.  相似文献   
112.
113.
114.
115.
A simple and rapid method is described for processing organ and water samples for the identification of diatoms so that they can be studied and recorded for taxonomic and diagnostic purposes. Samples are treated with concentrated nitric acid; the fluid obtained is centrifuged, and its sediment is dried, coated, and examined under the scanning electron microscope. The method does not alter the morphology of diatoms and allows the study of freshwater and seawater species present in the organs of bodies found in the water, making possible the diagnosis of drowning under specific conditions.  相似文献   
116.
Observations of high velocity bloodspatter on adjacent objects   总被引:1,自引:0,他引:1  
In a recent homicide investigation, high velocity backspatter was observed on the sleeve cuff of the accused. These minute droplets were discovered only after microscopic examination and were limited in number. A study was initiated to determine if these were truly backspatter droplets or transferred blood produced from light contact with a bloody item. It was observed that the backspattered blood was primarily limited to contact or near contact shots. An exception was a shot into an already bloody surface. It was found that backspattered blood would deposit on the shooter's shirt sleeve irrespective of the weave pattern. Transferred blood was observed only on the fiber tops. This information was found to be useful in reconstruction of events in suicides as well as possible homicides.  相似文献   
117.
Book Reviews in This Article:
Getting Rid of Patients: Contradictions in the Socialization of Physicians . By Terry Mizrahi
Physicians and Social Change . By John Colombotos and Corinne Kirchner
Changing Values in Medicine . Edited by Eric J. Cassell and Mark Siegler
Professional Ethics and Primary Care Medicine: Beyond Dilemmas and Decorum . By Harmon L. Smith and Larry R. Churchill
Physician—Patient Decision-Making: A Study in Medical Ethics . By Douglas N. Walton
With Dignity: The Search for Medicare and Medicaid . By Sheri I. David
The Dismissal of Students with Mental Disorders. Legal Issues, Policy Considerations, and Alternative Responses .
Courtroom Toxicology . By Marshall Houts, Randall C. Baselt, and Robert H. Cravey  相似文献   
118.
119.
Collaborative Environmental Management: What Roles for Government?   总被引:1,自引:0,他引:1  
  相似文献   
120.
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