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   74103篇
  免费   3336篇
各国政治   4601篇
工人农民   3061篇
世界政治   6300篇
外交国际关系   3904篇
法律   36656篇
中国共产党   11篇
中国政治   761篇
政治理论   21200篇
综合类   945篇
  2021年   424篇
  2020年   1195篇
  2019年   1544篇
  2018年   1796篇
  2017年   2075篇
  2016年   2281篇
  2015年   1867篇
  2014年   2133篇
  2013年   10665篇
  2012年   1779篇
  2011年   1900篇
  2010年   1914篇
  2009年   2144篇
  2008年   1927篇
  2007年   1918篇
  2006年   2086篇
  2005年   1971篇
  2004年   1854篇
  2003年   1632篇
  2002年   1700篇
  2001年   1985篇
  2000年   1713篇
  1999年   1508篇
  1998年   1179篇
  1997年   1022篇
  1996年   1011篇
  1995年   976篇
  1994年   984篇
  1993年   1001篇
  1992年   1127篇
  1991年   1141篇
  1990年   1103篇
  1989年   1127篇
  1988年   1103篇
  1987年   1105篇
  1986年   1124篇
  1985年   1179篇
  1984年   1034篇
  1983年   1054篇
  1982年   933篇
  1981年   867篇
  1980年   696篇
  1979年   788篇
  1978年   628篇
  1977年   556篇
  1976年   508篇
  1975年   446篇
  1974年   474篇
  1973年   463篇
  1972年   400篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
901.
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   
902.
903.
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   
904.
905.
Spleen and portal lymphnode sections from 86 drug addicts submitted for medico-legal autopsy at the Institute of Forensic Medicine in Copenhagen in the year 1979 were studied together with tissue sections from 24 "normal" persons. In 70% of the drug addicts the spleen weight was more than 200 g, and in 71% portal lymphnode hyperplasia was found. Birefringent foreign material was found in spleen tissue of drug addicts in 72% and in portal lymphnode tissue in 44%. Signs of antigen stimulation in both spleen and portal lymphnode tissue evaluated by the number of germinal centre and plasma cells were found in more than 80% of the drug addicts compared with about 20% of the "normal" persons. The results were related to anamnestic information of duration of drug abuse, to the spleen weight, to the occurrence of birefringent material and to the liver changes. Examination of lysozyme and immunoglobulin containing cells using the indirect preoxidase technique was performed in a total of 72 cases of spleen tissue, 59 cases of portal lymphnode tissue from drug addicts, 24 cases of spleen tissue and 18 of portal lymphnode tissue from "normal" persons. Lysozyme, IgM and IgG containing cells were found significantly more often among drug addicts than "normal" persons. The results indicate that the splenomegalia and the portal lymphnode hyperplasia often found in drug addicts are caused by continuous antigen stimulation due to repeated injections of various antigens.  相似文献   
906.
907.
908.
909.
910.
Health care financing has undergone numerous structural changes over the years. Change continues while extreme growth seriously affects the health care focus. The author examines the multiclass system and health financing trends. Restructuring techniques are also discussed.  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