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   13918篇
  免费   159篇
各国政治   414篇
工人农民   587篇
世界政治   778篇
外交国际关系   495篇
法律   9005篇
中国共产党   34篇
中国政治   144篇
政治理论   2441篇
综合类   179篇
  2021年   84篇
  2020年   192篇
  2019年   186篇
  2018年   263篇
  2017年   296篇
  2016年   350篇
  2015年   262篇
  2014年   286篇
  2013年   1094篇
  2012年   327篇
  2011年   412篇
  2010年   290篇
  2009年   340篇
  2008年   436篇
  2007年   478篇
  2006年   448篇
  2005年   393篇
  2004年   405篇
  2003年   354篇
  2002年   331篇
  2001年   479篇
  2000年   454篇
  1999年   358篇
  1998年   182篇
  1997年   136篇
  1996年   160篇
  1995年   133篇
  1994年   154篇
  1993年   157篇
  1992年   255篇
  1991年   324篇
  1990年   287篇
  1989年   277篇
  1988年   300篇
  1987年   282篇
  1986年   285篇
  1985年   267篇
  1984年   227篇
  1983年   209篇
  1982年   127篇
  1981年   144篇
  1980年   121篇
  1979年   137篇
  1978年   121篇
  1977年   101篇
  1976年   92篇
  1975年   97篇
  1974年   106篇
  1973年   116篇
  1971年   85篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
861.
862.
The public choice literature contains little formal analysis of the bureaucratic choice of production modes — public or private — of publicly funded services. An important question to be addressed is why some governmental bodies choose to provide a publicly funded service with publicly owned and operated production units whereas other governmental bodies contract with private firms to provide the same publicly funded service. This paper is the first formal attempt to remedy this gap in the literature. We develop a theoretical explanation of the government decision maker's choice between public and private production modes based on utility maximizing behavior. We then examine empirically this choice employing logit analysis. The empirical results, which include several tests for robustness, confirm our theoretical explanation. The results are significant and suggest that non-monetary constraints are an important factor affecting this choice of production modes and that monetary constraints are less influential.  相似文献   
863.
864.
Jeremy Horder, Provocation and Responsibility Oxford: Clarendon Press, 1992, pp xvi and 208 pp, hb £25.00.  相似文献   
865.
Transborder data flow and technology transfer issues have a substantial overlap. Transborder data flows represent flows of information with economic and/or cultural value. Electronic access to “know-how”, information, data, etc. is becoming more and more important to technology transfer and sharing. National transborder data flow policies either affect or can themselves be technology transfer policies.  相似文献   
866.
867.
868.
A sensitive method for the detection of anti-A and anti-B hemagglutinins in fresh saliva has been developed. The method utilizes a bromelin treated erythrocyte suspension as indicator cells and includes a simple procedure to concentrate these hemagglutinins. Antiserum directed against immunoglobulin A enhances the hemagglutination assay. We find that these salivary hemagglutinins are present in over 90% of the population and that their titer remains stable over a period of two months. These hemagglutinins can be used to blood type the donor of a saliva sample and can be used in a confirmatory test that complements the commonly used absorption-inhibition test which is used to detect salivary blood group agglutinogens. In preliminary studies we have determined that hemagglutinins can be successfully isolated and analyzed from dried saliva stains.  相似文献   
869.
870.
The research reported in this article sought to estimate the feasibility of measuring patterns of forgetting and forward telescoping in victimization survey data. It was suggested that if these two sources of memory bias could be accurately and reliably measured, victimization survey data could be adjusted to produce improved estimates of both the amount of crime and of changes in the crime rate over time. Examination of the data suggests that the likelihood of developing a general model for correcting mnemonic biases is very low. ll?is conclusion follows from: (I) evidence indicating differential victimization survey recall across reported and unreported crime events; (2) the apparent dissimilarities of telescoping/forgetting patterns across samples and seasons; and (3) the lack of a stable comparison estimate of the “true” distribution of incidents with which to calibrate a correction model.  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