全文获取类型
收费全文 | 6152篇 |
免费 | 140篇 |
专业分类
各国政治 | 245篇 |
工人农民 | 281篇 |
世界政治 | 482篇 |
外交国际关系 | 214篇 |
法律 | 3817篇 |
中国政治 | 55篇 |
政治理论 | 1174篇 |
综合类 | 24篇 |
出版年
2021年 | 43篇 |
2020年 | 77篇 |
2019年 | 113篇 |
2018年 | 145篇 |
2017年 | 126篇 |
2016年 | 133篇 |
2015年 | 83篇 |
2014年 | 129篇 |
2013年 | 641篇 |
2012年 | 157篇 |
2011年 | 173篇 |
2010年 | 132篇 |
2009年 | 153篇 |
2008年 | 196篇 |
2007年 | 178篇 |
2006年 | 151篇 |
2005年 | 148篇 |
2004年 | 168篇 |
2003年 | 141篇 |
2002年 | 106篇 |
2001年 | 322篇 |
2000年 | 283篇 |
1999年 | 195篇 |
1998年 | 81篇 |
1997年 | 83篇 |
1996年 | 56篇 |
1995年 | 60篇 |
1994年 | 56篇 |
1993年 | 43篇 |
1992年 | 126篇 |
1991年 | 141篇 |
1990年 | 132篇 |
1989年 | 133篇 |
1988年 | 117篇 |
1987年 | 130篇 |
1986年 | 112篇 |
1985年 | 104篇 |
1984年 | 98篇 |
1983年 | 85篇 |
1982年 | 60篇 |
1981年 | 74篇 |
1980年 | 36篇 |
1979年 | 75篇 |
1978年 | 44篇 |
1975年 | 37篇 |
1974年 | 49篇 |
1973年 | 54篇 |
1972年 | 39篇 |
1971年 | 34篇 |
1970年 | 29篇 |
排序方式: 共有6292条查询结果,搜索用时 15 毫秒
41.
Postmortem changes in sulfide concentrations in body tissues were examined in autopsied rats exposed to hydrogen sulfide concentrations of 550 to 650 ppm, and in nonexposed rats and humans. Analyses were made by gas chromatography, following an extractive alkylation. Sulfide concentrations in the blood, liver, and kidneys of rats increased in both the exposed and nonexposed groups, depending on the lapse of time after death. On the other hand, the lung, brain, and muscle showed little or no change in sulfide concentration with elapse of time after death. The data obtained from human tissues were almost the same as those for rats, except data for blood, in which no or little increase of sulfide was observed. 相似文献
42.
43.
We develop a model of the peace dividend and use it to predict the fiscal consequences of a reduction in the demand for military spending. The model is based on the assumption that the political process responds to political demands and costs in a way that maximizes net political benefits. The predictions of our model on how a peace dividend will be allocated over nonmilitary spending, tax relief, and deficit reduction is tested against the experience of eight major wars in United States history. 相似文献
44.
A case of kidnapping involving the concept of paternity testing is described. The couple arrested and charged with kidnapping stated the child in their possession was their biological daughter. Serological tests were performed on liquid blood samples in an effort to determine if the couple could have been the biological parents of the child. Two genetic inconsistencies were discovered in the 15 blood marker systems analyzed. 相似文献
45.
Tracy L. Devine Guzmán 《Bulletin of Latin American research》2005,24(1):92-122
If categories of 'race' and nationality are social and historical constructions laden with irrefutable meaning and consequences, then ethnic identities, like any other forms of identity, are means to other ends that may or may not be particular. Twentieth‐century indigenist history in Brazil reveals how the cultural politics of indigenism and nationalism can coalesce in a tautological politics of identity that undermines individual liberty and democratic heterogeneity. The concepts 'post‐indigenism,'post‐nationalism' and 'post‐identity' point to the strategic suspension of the infinite heterogeneity of the political subject as a means to widen the ground of shared experience and common interests beyond the realm of hollow and oppressive essentialisms. 相似文献
46.
V. K. Borooah 《Public Choice》1991,72(1):1-12
An important problem in the political economy of the UK is that the disparity of unemployment rates across its regions is much more marked than the corresponding dispersion of wage rates. One possibility is that this is due to the attitude of trade unions to their members in different regions. If unions wish to preserve parity between members in different regions then they will value wage equality between regions over and above wage levels. This may then persuade them to overlook inter-regional productivity differences in setting wages. The price that low-efficiency regions will then pay for this desire for wage equality is higher unemployment rates.Much of the research for this paper was carried out while the author was visiting the Trade Union Economics Research Institute (FIEF), Stockholm in 1989. An earlier version of this paper was presented at a seminar there and the author is gratefully to Villy Bergstrom, Paul Chen, Douglas Hibbs, Eva Udden-Jondal and other institute members for several useful comments. Comments from Kevin Lee, John Spencer and an anonymous referee have also substantially improved the paper. The usual disclaimer applies. 相似文献
47.
Charles B. Fleming Richard F. Catalano Monica L. Oxford Tracy W. Harachi 《Journal of Quantitative Criminology》2002,18(4):423-439
The social development model (SDM) is a theory of behavior that has proven useful in explaining the etiology of delinquency, violence, and substance use among adolescents as well as early antisocial behavior among pre-adolescents. A further test of the model is its generalizability across population groups. A section of the SDM representing prosocial influences in the etiology of problem behavior was compared for boys and girls and for children from low- and non low-income families using three waves of child, parent and teacher survey data on a sample of 851 elementary school students. Multiple group structural equation modeling was used to assess differences across groups in both measurement of model constructs and hypothesized structural paths between constructs. The results indicate overall similarity in the reliability of measurement models and validity of structural models. 相似文献
48.
A dissecting intramural haematoma of the coronary artery is an infrequent cause of sudden and unexpected death. Most cases are women and in a significant number of these women, the haematoma occurred at term to 80 days postpartum. Because the intimal rupture and communication with the lumen were not found in most of the cases, the site of rupture has been considered to be a vasa vasorum. The authors report on a case of one woman who was at a later postpartum period (106 days). The microscopic finding of the dissected coronary artery revealed two intimal tears in a section. The case showed that the dissecting intramural haematoma of the coronary artery is caused not only by the rupture of the vasa vasorum but also by the rupture of the intima. 相似文献
49.
Distinctive blunt force injuries caused by a crescent wrench. 总被引:1,自引:0,他引:1
50.
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