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   26531篇
  免费   1549篇
各国政治   1059篇
工人农民   983篇
世界政治   2172篇
外交国际关系   822篇
法律   17340篇
中国共产党   3篇
中国政治   153篇
政治理论   5306篇
综合类   242篇
  2020年   501篇
  2019年   549篇
  2018年   659篇
  2017年   765篇
  2016年   809篇
  2015年   649篇
  2014年   693篇
  2013年   2679篇
  2012年   630篇
  2011年   738篇
  2010年   797篇
  2009年   789篇
  2008年   675篇
  2007年   676篇
  2006年   720篇
  2005年   605篇
  2004年   584篇
  2003年   609篇
  2002年   551篇
  2001年   1005篇
  2000年   886篇
  1999年   730篇
  1998年   409篇
  1997年   349篇
  1996年   296篇
  1995年   320篇
  1994年   371篇
  1993年   321篇
  1992年   502篇
  1991年   543篇
  1990年   485篇
  1989年   527篇
  1988年   471篇
  1987年   464篇
  1986年   483篇
  1985年   481篇
  1984年   433篇
  1983年   445篇
  1982年   346篇
  1981年   331篇
  1980年   273篇
  1979年   367篇
  1978年   236篇
  1977年   210篇
  1976年   186篇
  1975年   174篇
  1974年   198篇
  1973年   172篇
  1972年   155篇
  1971年   144篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
131.
132.
A 22-year-old Korean soldier, who had received blows to the neck and epigastrium from an officer 10 h earlier, suddenly died after massive hematemesis. He had been in relatively good health except for episodes of blood-tinged vomiting approximately 5 and 7 months prior to this event. Postmortem examination revealed angiodysplasia involving the gastroesophageal junction, and the stomach was distended with blood. No abnormal findings were present around the whole viscera, and the duodenum was free of blood. The pathologic significance of upper gastrointestinal angiodysplasia as a potential source of bleeding and a chronologic correlation between the trauma and bleeding are discussed.  相似文献   
133.
134.
European Journal of Law and Economics - In this article I try to find answers for three questions: Which functions are exercised by the Court of Audit in the Netherlands, and what kinds of...  相似文献   
135.
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   
136.
137.
Presented in this paper are the initial results involving the use of the nose or outer ear as temperature measurement sites to determine the postmortem period of the human corpse. Simple mathematical models for both sites are developed based on cooling curves of five corpses. Analysis of errors between actual and calculated postmortem intervals suggest that in its present form, the described methods would not be suitable for use in accurately determining the time since death of human corpses.  相似文献   
138.
139.
Proposals to ration health care in the United States meet a number of objections, symbolic and literal. Nonetheless, an acceptance of the idea of rationing is a necessary first step toward universal health insurance. It must be understood that universal health care requires an acceptance of rationing, and that such an acceptance must precede enactment of a program, if it is to be economically sound and politically feasible. Commentators have argued that reform of the health care system should come before any effort to ration. On the contrary, rationing and reform cannot be separated. The former is the key to the latter, just as rationing is the key to universal health insurance.  相似文献   
140.
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