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   10380篇
  免费   266篇
各国政治   742篇
工人农民   379篇
世界政治   787篇
外交国际关系   514篇
法律   5588篇
中国共产党   1篇
中国政治   63篇
政治理论   2490篇
综合类   82篇
  2021年   60篇
  2020年   130篇
  2019年   145篇
  2018年   212篇
  2017年   251篇
  2016年   261篇
  2015年   181篇
  2014年   224篇
  2013年   1337篇
  2012年   228篇
  2011年   251篇
  2010年   231篇
  2009年   265篇
  2008年   324篇
  2007年   315篇
  2006年   286篇
  2005年   253篇
  2004年   239篇
  2003年   240篇
  2002年   221篇
  2001年   344篇
  2000年   294篇
  1999年   290篇
  1998年   154篇
  1997年   132篇
  1996年   117篇
  1995年   119篇
  1994年   119篇
  1993年   111篇
  1992年   148篇
  1991年   208篇
  1990年   178篇
  1989年   182篇
  1988年   178篇
  1987年   197篇
  1986年   203篇
  1985年   159篇
  1984年   155篇
  1983年   147篇
  1982年   109篇
  1981年   107篇
  1980年   94篇
  1979年   142篇
  1978年   105篇
  1977年   86篇
  1976年   71篇
  1975年   88篇
  1974年   104篇
  1973年   90篇
  1971年   62篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
72.
73.
Some features of early child care are more prominent in Norway than in other countries, such as emphasis on the outdoor environment. Of general relevance and interest is the form of day care provided by forest day-care centers. Three ideas form the development of these centers placed in wild areas. First, throughout history, Norwegians have had a close attachment to nature and some parents want to provide their children with outdoor experiences at an early age. Second, urging children to play outdoors characterizes the image many parents have of a happy, healthy childhood. Third, provision of day care for children has always been restricted in western countries, forcing parents to invent types of service that can become part of an ecological system that promotes healthy development.The forest day-care centers developed recently represent a supplement to the wide typology of child care in the 21st century. The article outlines the connections between these ideas in general European and western history and Norwegian history and presents debate and decisions about a question dating from the last half of the 1980s. It concludes that the forest day-care centers are perhaps only a modern form of the original kindergarten concept, which started in Europe and America as gardens for children not gardens of children.  相似文献   
74.
Ethanol was determined by gas chromatography in a variety of tissues and body fluids secured at autopsy in 61 cases. The specimens tested included right and left heart blood, femoral blood, pericardial fluid, cerebrospinal fluid, vitreous humor, urine, stomach contents, and brain. Statistical analysis of the cases revealed no significant differences among the various blood sites tested. However, the variations in blood ethanol concentrations among the various sampling sites within each case were as follows: 40 cases showed differences of less than 25%; 16 cases revealed variability between 25% and 50%, 4 cases had differences exceeding 50%. In one case, satisfactory blood analyses could not be accomplished. The larger variances occurred especially in those instances in which stomach alcohol concentration was 0.50% or greater. In one case, the variability amongst the different blood sites exceeded 400% (femoral blood--0.043%, right atrium--0.070%, root of aorta--0.156%); the brain was 0.050%, and the stomach contents was 1.2%. For all 61 cases, variances in blood alcohol content among the different sampling sites in a single cadaver ranged from 1.8 to 428%.  相似文献   
75.
Within the context of legal reform, the Battered Wife Movement has divided feminists on the question of criminal justice as a desirable component of a feminist agenda. Thus it provides a good example of the dilemmas of developing a feminist theory about the state as the basis for informed practice. In this paper, Currie overviews the way in which the BWM has been transformed from a radical demand for the redistribution of social power into an expansion of current patriarchal institutions. As an example of the institutionalization of feminist issues, however, she rejects explanations of this transformation as simply ideological revision by the state. Rather, Currie notes that it occurs through and not against feminist discourse, meaning that we must acknowledge theory as practice if we are to develop a truly subversive and liberatory discourse within feminist scholarship.  相似文献   
76.
77.
Deoxyribonucleic acid (DNA) typing of ribosomal ribonucleic acid (rRNA) genes was performed with a polymerase chain reaction (PCR) assay for species identification. A variable region of the 28S ribosomal RNA gene was amplified with primers complementary to flanking sequences phylogenetically well conserved. The products of twelve animal DNAs (human, Japanese monkey, dog, cattle, pig, cat, rabbit, mouse, rat, chicken, frog, and fish) were separated by polyacrylamide gel electrophoresis, each revealing a few bands ranging from 150 to 100 base pairs. The band patterns obtained from each DNA sample differed in number and size, which indicates the applicability of the method to species identification. Samples containing either as little as 1 pg of DNA or degraded DNA of 0.2 to 0.5 kb in length were able to give detectable bands. Postmortem human tissue DNAs were tested as an example. They showed a pattern identical to the human control one, which was distinct from those of the other animals examined.  相似文献   
78.
Policy analysis for the Congress is a timely subject. Several policy initiatives have emerged recently from the “first branch.” Others have demonstrated an independent capacity for analysis that is impressive by historical standards. This article introduces a practitioner symposium of three related works on policy analysis for Congress, with appropriate commentary by a distinguished veteran. It argues that because timing is crucial in the congressional policy process, anticipation and advance preparation are central to the effective use of analysis. The other articles illustrate the stages of advance preparation—of the policy analyst, the congressional environment, and the Member for voting—in the form of case studies.  相似文献   
79.
The Hunter family of Rhode Island produced two important American diplomatists of the nineteenth century. The elder William Hunter served for nine years as the American envoy to Brazil, where he exerted positive influence over the young emperor, Dom Pedro II. The younger William Hunter entered the Department of State in 1829 and spent fifty-seven years there under twenty-one Secretaries of State. For decades the department's third-ranking officer, he became its “mentor and authority.” The overlapping careers of Hunter and his two successors helped guide American diplomacy until 1937.  相似文献   
80.
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