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   10575篇
  免费   336篇
各国政治   305篇
工人农民   518篇
世界政治   631篇
外交国际关系   331篇
法律   6762篇
中国共产党   34篇
中国政治   133篇
政治理论   2058篇
综合类   139篇
  2021年   63篇
  2020年   155篇
  2019年   135篇
  2018年   219篇
  2017年   256篇
  2016年   287篇
  2015年   235篇
  2014年   228篇
  2013年   889篇
  2012年   251篇
  2011年   291篇
  2010年   225篇
  2009年   287篇
  2008年   352篇
  2007年   360篇
  2006年   342篇
  2005年   320篇
  2004年   302篇
  2003年   251篇
  2002年   246篇
  2001年   360篇
  2000年   336篇
  1999年   261篇
  1998年   167篇
  1997年   118篇
  1996年   144篇
  1995年   119篇
  1994年   134篇
  1993年   133篇
  1992年   205篇
  1991年   251篇
  1990年   219篇
  1989年   201篇
  1988年   225篇
  1987年   207篇
  1986年   227篇
  1985年   202篇
  1984年   166篇
  1983年   160篇
  1982年   110篇
  1981年   128篇
  1980年   101篇
  1979年   104篇
  1978年   91篇
  1977年   78篇
  1976年   69篇
  1975年   67篇
  1974年   65篇
  1973年   81篇
  1971年   53篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
141.
142.
143.
144.
The article deals with experimental data on design of the method used for detection of sperm, blood and vaginal secretions according to isoelectric points of acid phosphatases, differential diagnosis of ABO group antigens in "mixed" stains as well as detection of phenotype of red cell acid phosphatase by isoelectric focusing method.  相似文献   
145.
The political feasibility of protectionist policies that regulate international industry derives from the absence of overt collusion among domestic import-competing producers. The regulation of international industry cannot be explicit since governments would thereby be perceived to be approving (or instigating) international collusion. Hence, voluntary export restraints have been popularly presented with a focus on the difficulties confronted by domestic import-competing producers and a de-emphasis on the mutual gains to domestic and foreign producers from monitoring by a foreign government of a restrictive export cartel arrangement. Similarly, trigger-price mechanisms have popularly been explained in terms of the need for anti-dumping measures to preserve fair competition. Likewise, the involuntary export tax derived in the first instance from an administratively validated (but, as demonstrated by Kalt's econometric analysis, contentious) complaint of unfair foreign competition. Voluntary export restraints, trigger-price mechanisms, and involuntary export taxes are however protectionist devices, the beneficiaries of which can transcend national jurisdictions, and which have in common the characteristic that the gains to domestic industry interests derive from the regulation of foreign competitors.A previous version of this paper was presented at a conference on Economics and Power organized by the FWS Institute of Zug and held at Interlaken, Switzerland in July 1988.  相似文献   
146.
This paper departs from the Tullock cost paradigm that views competition for monopoly privilege as a welfare-inimical process that wastefully dissipates preexisting producers' surplus and, occasionally, leads to inefficient increases in costs and counterproductive uses of scarce resources. The potential availability of rent-seeking may bring about the elimination of inefficient regulatory regimes that retard or prevent the introduction of cost-reducing innovations. Air quality management is but one area in which innovation rent-seeking holds promise for concrete welfare gains. Researchers may wish to focus on institutional mechanisms designed to overcome the transactions costs and free rider disincentives to the formation of a coalition to seek innovation rents. An example of such a mechanism might be a joint venture that requires all venture members to engage in lobbying and to contribute to collective research efforts. These unaddressed questions await future research.The authors are grateful for the insightful comments of Gordon Tullock, Robert D. Tollison, Michael T. Marlow and J.R. Clark. The usual caveats apply. The views expressed herein are solely those of the authors and should not be taken to represent the views of their employers.  相似文献   
147.
148.
An increase in birth rates to Minneapolis minors following the enactment of a parental notification law was examined. A well-publicized link between increasing birth rates and the law is shown to have been premature. Birth, abortion, and population data by age, race, and region suggest that the increasing birth rate in Minneapolis was not related to parental notification, but rather to a growing racial minority population.Preparation of this article was supported in part by an Aldeen Grant from Wheaton College. The authors wish to thank the Minnesota Center for Health Statistics, particularly James Wigginton and Carol Vargas, for their considerable work to provide birth, abortion, and population data in a form suitable for the current analysis. The authors also thank Americans United for Life for purchasing the data and providing them to the authors.  相似文献   
149.
150.
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