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   10396篇
  免费   334篇
各国政治   613篇
工人农民   355篇
世界政治   924篇
外交国际关系   540篇
法律   5482篇
中国政治   58篇
政治理论   2661篇
综合类   97篇
  2023年   61篇
  2020年   129篇
  2019年   176篇
  2018年   232篇
  2017年   243篇
  2016年   275篇
  2015年   177篇
  2014年   237篇
  2013年   1342篇
  2012年   262篇
  2011年   302篇
  2010年   232篇
  2009年   256篇
  2008年   304篇
  2007年   366篇
  2006年   308篇
  2005年   256篇
  2004年   288篇
  2003年   291篇
  2002年   262篇
  2001年   307篇
  2000年   318篇
  1999年   238篇
  1998年   183篇
  1997年   156篇
  1996年   159篇
  1995年   130篇
  1994年   130篇
  1993年   138篇
  1992年   191篇
  1991年   195篇
  1990年   206篇
  1989年   188篇
  1988年   210篇
  1987年   210篇
  1986年   182篇
  1985年   155篇
  1984年   147篇
  1983年   139篇
  1982年   117篇
  1981年   94篇
  1980年   87篇
  1979年   92篇
  1978年   78篇
  1977年   68篇
  1976年   56篇
  1975年   52篇
  1974年   64篇
  1973年   60篇
  1970年   46篇
排序方式: 共有10000条查询结果,搜索用时 828 毫秒
951.
Books reviewed:
Joanna Cagan and Neil deMause, Field of Schemes: How the Great Stadium Swindle Turns Public Money into Private Profit
Jerold J. Duquette, Regulating the National Pastime: Baseball and Antitrust .
James Quirk and Rodney Fort, Hard Ball: The Abuse of Power in Pro Team Sports .
Wilbur C. Rich, editor, The Economics and Politics of Sports Facilities .
Mark S. Rosentraub, Major League Losers: The Real Cost of Sports and Who's Paying for It.
Jay Weiner, Stadium Games: Fifty Years of Big League Greed and Bush League Boondoggles .  相似文献   
952.
A new educational trend has developed over the past decade that may actually be doing more harm to high school students than good. States have been passing legislation requiring high school students to complete a college prep‐level curriculum in order to receive a high school diploma. While this push for higher academic achievement is a great idea, students are not given the educational base they need to be able to succeed in such a program once they reach high school and many are left without the skills necessary to handle such academic expectations. This Note proposes guidelines for changing these rigid state statutes in favor of a Three‐Tiered System that gives students options based on their academic abilities and urges states to adopt these changes.  相似文献   
953.
954.
IN 2010, in the midst of economic turmoil, Irish society is enriched because of its close friendship with China and the Chinese people; a friendship that is based on mutual respect, cultural understanding and trust.  相似文献   
955.
While rural poverty is endemic in the Andean region, structural adjustment programmes have led to a dismemberment of agricultural research and extension services so that they are unable to serve the needs of smallholder farmers. The NGO Practical Action has been working in the Andes to address farmers' veterinary and agriculture needs. The work has included the training of farmer-to-farmer extension agents, known locally as Kamayoq. The Kamayoq have encouraged farmer participatory research, and local farmers pay them for their veterinary and crop advisory services in cash or in kind. The Kamayoq model is largely an unsubsidised approach to the provision of appropriate technical services and encouragement of farmer participation. The model also illustrates that, in the context of encouraging farmer participation and innovation, NGOs have advantages over research organisations because of their long-term presence, ability to establish trust with local farmers, and their emphasis on social and community processes.  相似文献   
956.
Participatory research approaches are increasingly popular with scientists working for poverty alleviation, sustainable rural development, and social change. This introduction offers an overview of the special issue of Development in Practice on the theme of ‘operationalising participatory research and gender analysis’. The purpose of this special issue is to add value to the discussion of methodological, practical, philosophical, political, and institutional issues involved in using gender-sensitive participatory methods. Drawing on 16 articles, we place some of the main issues, empirical experiences, and debates in participatory research and participatory technology development in the context of implementation, evaluation, and institutionalisation of participatory research and evaluation approaches.  相似文献   
957.
958.
In this work we aimed to compare the application of increasing PCR cycle number, whole genome amplification and nested-PCR on fingerprints genetic analysis. Results were compared for correct alleles, allele dropin and allelic dropout. We concluded that increasing the number of PCR cycles is yet the best way to attain the required sensitivity.  相似文献   
959.
Current forensic DNA profiling methods rely on the analysis of samples at specialised laboratories with an average turnaround time of several days. The ability to rapidly determine a partial profile of short tandem repeats at the point-of-arrest would be of great benefit to police forces around the world, for example enabling a suspect to be rapidly included or excluded from an investigation. We have developed a homogeneous PCR method for the interrogation of STR loci utilising fluorescent oligonucleotide probes and melting curve analysis. Alleles of the D18S51, TH01 and D8S1179 loci were differentiated and identified on the basis of target length and probe melting temperature. Assay performance was evaluated by comparing melting peak data with the AmpFlSTR® SGM Plus® system. The method is compatible with direct analysis of unpurified buccal swab samples, enabling a partial STR profile to be generated within 1 h.  相似文献   
960.
Correlation among age, concentrations of carboxyhemoglobin and hydrogen cyanide, oxygen density and hemolysis were studied in 120 house fire victims. Victims aged over 60 years comprised approximately 50% of the pooled subjects. Blood samples were mainly collected from the left ventricle, but sometimes from both the right and left ventricles. The concentration of carboxyhemoglobin ranged from 1-95%, of which 71 persons (59.7%) died with carboxyhemoglobin concentrations below 60%. Carboxyhemoglobin concentrations below 10% were found in 9 persons (7.5%). Most of these cases involved the elderly persons. In this paper, we report on the death of elderly victims as a result of low carboxyhemoglobin concentrations. A significant correlation of blood carboxyhemoglobin concentrations existed between the right and left ventricles. The concentration of carboxyhemoglobin in the left ventricle was significantly higher than that in the right. Two out of 31 victims whose hydrogen cyanide concentrations were determined, succumbed to hydrogen cyanide poisoning, having a high concentration of hydrogen cyanide and a low concentration of carboxyhemoglobin. On analysis, oxygen density was found to be low in 13 persons. A negative correlation was shown between carboxyhemoglobin concentration and hemolysis. Inasmuch as hemolysis may indicate the extent of heat dissociation, hemolysis should provide an index of carbon monoxide dissociation from carboxyhemoglobin. In the present study of victims, possible causes of death i.e., carbon monoxide gas poisoning, hydrogen cyanide poisoning, oxygen deprivation, burning, shock due to burns and others were estimated. The survival time for elderly victims was considered to be short.  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