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   16661篇
  免费   244篇
各国政治   722篇
工人农民   1357篇
世界政治   743篇
外交国际关系   629篇
法律   9758篇
中国共产党   2篇
中国政治   33篇
政治理论   3561篇
综合类   100篇
  2020年   106篇
  2019年   139篇
  2018年   1410篇
  2017年   1363篇
  2016年   1195篇
  2015年   215篇
  2014年   194篇
  2013年   1059篇
  2012年   430篇
  2011年   1114篇
  2010年   1163篇
  2009年   756篇
  2008年   953篇
  2007年   893篇
  2006年   233篇
  2005年   253篇
  2004年   356篇
  2003年   341篇
  2002年   251篇
  2001年   323篇
  2000年   299篇
  1999年   240篇
  1998年   113篇
  1997年   136篇
  1996年   114篇
  1995年   121篇
  1994年   123篇
  1993年   100篇
  1992年   171篇
  1991年   183篇
  1990年   165篇
  1989年   180篇
  1988年   168篇
  1987年   147篇
  1986年   170篇
  1985年   131篇
  1984年   139篇
  1983年   140篇
  1982年   88篇
  1981年   81篇
  1980年   59篇
  1979年   123篇
  1978年   76篇
  1977年   73篇
  1976年   58篇
  1975年   69篇
  1974年   82篇
  1973年   79篇
  1972年   69篇
  1971年   62篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
Aggressive pursuit of free trade agreements (FTAs) and customs unions (CUs) by major and minor trading powers alike challenges the conventional wisdom in favor of such pursuit – competitive liberalization. An equally plausible explanation for an active bilateral and regional trade agreement policy, one which effectively de-emphasizes multilateralism, may be competitive imperialism. The protection and enforcement of intellectual property rights is one area in which new provisions, going beyond multilateral rules, are being negotiated and written into FTAs and CUs. Such provisions may yield insights into which characterization of bilateralism and regionalism – competitive liberalization or competitive imperialism – is more apt. Rice Distinguished Professor, The University of Kansas, School of Law, Green Hall, 1535 West 15th Street, Lawrence, KS 66045-7577, USA. Tel. +1-785-8649224. Fax. +1-785-8645054. www.law.ku.edu. J.D., Harvard (1989); M.Sc., Oxford (1986); M.Sc., London School of Economics (1985); A.B., Duke (1984). Marshall Scholar (1984-86). Member, Council on Foreign Relations, Royal Society for Asian Affairs, and Fellowship of Catholic Scholars. Author, Modern GATT Law (Sweet & Maxwell 2005), International Trade Law: Theory and Practice (2nd ed. 2000, 3rd ed. forthcoming 2007-08), and Trade, Development, and Social Justice (Carolina Academic Press 2003). I am thankful to my Research Assistant, Mr. David R. Jackson (B.A., George Mason University, 1992; J.D. Class of 2007, University of Kansas), for his indispensable help on this work. I also am grateful to Dr. Mohammed El Said, University of Central Lancashire (UCLAN), for his consistent support and friendship, and for what he has taught and continues to teach me about international trade and intellectual property.  相似文献   
52.
53.
54.
55.
Bloodstains were made with 200 microliters blood on each of 11 different common substrates to examine the effect of the stain carrier on the amount and quality of DNA recoverable. High-molecular-weight DNA was extracted from all samples after 2 days. The yield of DNA from each sample varied considerably, not only between the different stain carriers but also within a given category. With a DNA yield of up to 10 micrograms, paper, glass, nylon, wood, smooth leather and wool gave the best results, followed by blue denim and wallpaper (up to 6 micrograms), cotton fabric and carpeting (up to 4 micrograms) and suede (up to 2 micrograms). For several stain carriers the DNA-containing solution was contaminated by chemical substances, which in the case of the blue denim, suede, and carpet samples inhibited the digestion of the DNA with restriction enzymes and prevented DNA typing. The different textures of the stain carriers tested and (as for varying yields on the same carrier) the differing degree of loss of DNA during extraction and the physiological variation in the number of leukocytes in human blood are discussed as possible reasons for the wide range of variation in the amounts of DNA it was possible to extract.  相似文献   
56.
57.
With new technically advanced methods and computers at our disposal, the efficient market hypothesis is once again being debated. At the same time, we are witnessing an unprecedented growth in both existing and new financial markets. These new markets are often in economies which have just recently embraced free market economics; we term these stock markets infant markets. Such stock markets are obviously not efficient in allocating the supply of savings to productive capital. We do not test whether or not these infant markets are informationally efficient, but instead examine whether and how they are becoming more efficient. We propose modelling the excess returns of individual securities using a multi-factor model with time-varying coefficients and generalised auto-regressive conditional heteroskedastic (GARCH) errors. If the markets are becoming more informationally efficient or the agents are learning, we would expect this to manifest itself as the time-varying coefficients becoming more stable as time increases. We test our model using data on four Bulgarian shares. First, we estimate an AR(2) model and a GARCH-M(1,1) model for the shares. Then, we estimated our AR(2) model with time varying coefficients and GARCH type errors. We find varying levels of efficiency and varying speeds of movement towards efficiency within our sample of four shares.  相似文献   
58.
59.
60.
The Tax Reform Act of 1986 rewrote the federal income tax code, bringing it closer to policy professionals' vision of what constitutes an equitable and efficient income tax. Research on tax compliance suggests the law might have affected taxpayer compliance in three ways: by reducing opportunities to overstate deductions, by changing perceptions of fairness, and by altering tax liabilities. Changes in taxpayer perceptions, attitudes, and noncompliance intentions were examined in three bodies of survey data, each containing pre-and post-reform data from independent samples of the same population. The results show an improved normative climate for taxpayer compliance and point to both the feasibility and the importance of examining the effects of substantive tax policies on taxpayer perceptions, attitudes, and behavioral intentions.  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