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   13666篇
  免费   334篇
各国政治   646篇
工人农民   534篇
世界政治   899篇
外交国际关系   464篇
法律   8750篇
中国政治   84篇
政治理论   2537篇
综合类   86篇
  2020年   152篇
  2019年   187篇
  2018年   235篇
  2017年   285篇
  2016年   304篇
  2015年   203篇
  2014年   281篇
  2013年   1368篇
  2012年   305篇
  2011年   333篇
  2010年   299篇
  2009年   281篇
  2008年   354篇
  2007年   385篇
  2006年   384篇
  2005年   316篇
  2004年   312篇
  2003年   349篇
  2002年   288篇
  2001年   554篇
  2000年   501篇
  1999年   409篇
  1998年   177篇
  1997年   141篇
  1996年   142篇
  1995年   129篇
  1994年   148篇
  1993年   128篇
  1992年   238篇
  1991年   291篇
  1990年   276篇
  1989年   287篇
  1988年   270篇
  1987年   302篇
  1986年   274篇
  1985年   279篇
  1984年   235篇
  1983年   249篇
  1982年   164篇
  1981年   172篇
  1980年   130篇
  1979年   206篇
  1978年   152篇
  1977年   134篇
  1976年   109篇
  1975年   123篇
  1974年   137篇
  1973年   130篇
  1972年   94篇
  1971年   102篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
82.
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   
83.
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   
84.
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   
85.
86.
87.
88.
89.
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   
90.
Social scientists have theorized about the cycle of domestic violence in family abuse. Little research has addressed dating violence as a consequence to the experience of domestic violence by children. This article deals with the self-reported experience of dating violence by high school students from abusive and nonabusive households. A survey was conducted of 1,353 students in a rural area of North Dakota. Results indicated that students from abusive households showed significantly higher incidence of dating violence than those from homes where no abuse was evident. However, less than one in five of the students from abusive home reported dating violence, providing little support for the cycle of violence hypothesis. Students from abusive homes viewed violence as negatively as students from nonabusive homes. Thus, while there are significant differences between the two groups, there are also important similarities. Although there is apparently a greater risk of dating violence among students who have experienced violence at home, these data do not support the idea of an inescapable pattern of violence among adolescents who have experienced violence themselves.  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