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   24606篇
  免费   1414篇
各国政治   1052篇
工人农民   1142篇
世界政治   1580篇
外交国际关系   781篇
法律   16596篇
中国共产党   5篇
中国政治   153篇
政治理论   4547篇
综合类   164篇
  2021年   121篇
  2020年   501篇
  2019年   548篇
  2018年   728篇
  2017年   760篇
  2016年   829篇
  2015年   614篇
  2014年   653篇
  2013年   2603篇
  2012年   663篇
  2011年   685篇
  2010年   685篇
  2009年   721篇
  2008年   718篇
  2007年   677篇
  2006年   734篇
  2005年   628篇
  2004年   618篇
  2003年   516篇
  2002年   586篇
  2001年   858篇
  2000年   795篇
  1999年   632篇
  1998年   345篇
  1997年   271篇
  1996年   286篇
  1995年   276篇
  1994年   256篇
  1993年   273篇
  1992年   442篇
  1991年   470篇
  1990年   442篇
  1989年   435篇
  1988年   446篇
  1987年   423篇
  1986年   464篇
  1985年   453篇
  1984年   383篇
  1983年   369篇
  1982年   269篇
  1981年   238篇
  1980年   210篇
  1979年   315篇
  1978年   188篇
  1977年   157篇
  1976年   129篇
  1975年   149篇
  1974年   175篇
  1973年   142篇
  1972年   130篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
251.
252.
A 19-year-old school boy suffered from fluctuating uncharacteristic chest pain in the last 20 h before his death. He died unexpectedly within a few minutes of a hemopericardium, which resulted from an aneurysmal rupture of the ascending aorta. The patient's past history as well as the autopsy and ultrastructural findings led to the diagnosis of Marfan's syndrome with alterations of the cardiovascular skeletal system but no ophthalmological involvement ("oligosymptomatic" form of Marfan's syndrome). Appraisal of the cause of death is made more difficult by the fact that medical treatment was undertaken on the same day, whereby subtotal liver crushing was established that had resulted from attempts at resuscitation.  相似文献   
253.
Transfer trauma is alleged to be an increase in morbidity and mortality in institutionally relocated chronically ill elderly. Efforts by the legal profession to persuade courts that transfer trauma should be a legally recognized phenomenon invoking judicial protections against transfer (the "transfer trauma argument") have been unproductive. In O'Bannon v. Town Court Nursing Center, Inc., the United States Supreme Court denied standing to elderly persons claiming a property interest in remaining in alleged substandard facilities. The Court rejected the argument that the possibility of transfer trauma constituted a deprivation of life or liberty that would have required due process protections of notice and hearing. Despite the Court's preclusion of transfer trauma litigation in a constitutional context and the general unwillingness of lower courts to recognize the phenomenon, attorneys continue to burden the judicial system with frivolous transfer trauma arguments. The unfruitful pursuit of a judicial remedy for the ethical and social problems that arise with relocation of the elderly continues, in part, because of a misguided belief that this distressing social phenomenon is best remedied by the courts. Judicial unwillingness to recognize the transfer trauma argument, however, does not preclude legislative consideration of the humanitarian issues concerning the institutional relocation of elderly persons. This Article examines gerontological research in order to understand the judicial rejection of the transfer trauma argument and argues in support of legislative and educational solutions for the ethical and social problems attending transfer.  相似文献   
254.
255.
Approximately 15% of victims of instantly lethal central nervous system trauma have an empty or nearly empty heart at autopsy. This article defines and discusses the "empty heart" sign.  相似文献   
256.
257.
258.
This paper highlights the difficulties and complexities of development assistance projects through an analysis of 2 Urban Functions in Rural Development projects conducted by the US Agency for International Development (AID) in Upper Volta and northern Cameroon in 1977-82. The general objectives of the Upper Volta project were to carry out urban function studies, develop a plan for strengthening the contributions of urban centers to rural development, develop a list of investment priorities for facilities and services, and increase the capacities of the Ministry in planning processes and methods. The 2-year project was hindered by a 1-year delay in initiating assistance due to difficulties in locating a contractor. In addition, the contractor and other team members felt there was little justification for studies of spatial organization in a country with so much evident need; rather, they focused on a small rural works program and establishment of effective local government, producing an inconsistency between team activities and the original project agreement. A request by the team to extend the project 1 year beyond its official completion date to compensate for early delays was rejected by USAID. Nonetheless, there was agreement that the project had a small positive impact in Upper Volta. Key lessons from Upper Volta were transferred to the Cameroon project. Although this project was judged to have achieved its objective of preparing a regional plan and of identifying programs for facilities, services, and small-scale enterprises, it was beset by problems of inexperience and technical underqualification of team members, poor communication, inconsistency of USAID guidelines, and methodological confusion. It is suggested that a central challenge for such programs is to create a body of qualified Americans who can work with their local counterparts in meeting the challenges of development. A measure of the success or failure of these projects should be the degree to which learning contributes to improved performance.  相似文献   
259.
The issue of whether civilly committed patients should be extended the right to accept or refuse treatment has generated much controversy and litigation during the past 15 years. In general, the current rule is that in nonemergency situations, individuals who are competent to give informed consent to treatment should be extended the right to refuse it. Obviously, the manner in which this rule is implemented partly depends on how competence to consent to treatment is defined and measured. Most researchers have implicitly assumed that an understanding of treatment information is the sole criterion of competence. It is argued that such a definition may be incomplete and is in need of reexamination. Following a review and analysis of the relevant legal and psychological literature, a comprehensive construct of competency to consent to treatment is proposed and future directions for research are discussed.  相似文献   
260.
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