全文获取类型
收费全文 | 4751篇 |
免费 | 166篇 |
专业分类
各国政治 | 232篇 |
工人农民 | 182篇 |
世界政治 | 339篇 |
外交国际关系 | 126篇 |
法律 | 2991篇 |
中国共产党 | 1篇 |
中国政治 | 28篇 |
政治理论 | 987篇 |
综合类 | 31篇 |
出版年
2020年 | 60篇 |
2019年 | 68篇 |
2018年 | 85篇 |
2017年 | 104篇 |
2016年 | 104篇 |
2015年 | 96篇 |
2014年 | 87篇 |
2013年 | 490篇 |
2012年 | 130篇 |
2011年 | 120篇 |
2010年 | 106篇 |
2009年 | 104篇 |
2008年 | 133篇 |
2007年 | 129篇 |
2006年 | 126篇 |
2005年 | 123篇 |
2004年 | 126篇 |
2003年 | 120篇 |
2002年 | 112篇 |
2001年 | 182篇 |
2000年 | 169篇 |
1999年 | 128篇 |
1998年 | 68篇 |
1997年 | 52篇 |
1996年 | 43篇 |
1995年 | 56篇 |
1994年 | 50篇 |
1993年 | 47篇 |
1992年 | 91篇 |
1991年 | 88篇 |
1990年 | 106篇 |
1989年 | 88篇 |
1988年 | 83篇 |
1987年 | 83篇 |
1986年 | 104篇 |
1985年 | 109篇 |
1984年 | 76篇 |
1983年 | 78篇 |
1982年 | 50篇 |
1981年 | 47篇 |
1980年 | 44篇 |
1979年 | 48篇 |
1978年 | 55篇 |
1976年 | 35篇 |
1975年 | 46篇 |
1974年 | 61篇 |
1973年 | 55篇 |
1972年 | 42篇 |
1970年 | 34篇 |
1969年 | 41篇 |
排序方式: 共有4917条查询结果,搜索用时 156 毫秒
951.
Endogenous ethanol concentrations in blood were determined by sensitive headspace gas chromatography/mass spectrometry in 1557 residents of the United Arab Emirates. The subjects were from 13 nationalities, of both sexes and of different age groups. There was no significant difference in blood ethanol concentration between nationalities or between sexes within and between nationalities. The data was pooled and the overall median, minimum, maximum, 25% percentile and 75% percentile were 0.04, 0.00, 3.52, 0.01 and 0.09 mg/dl respectively. The values of blood ethanol concentration as reported in this study indicate that they are far too low to have any forensic significance. 相似文献
952.
This report examines possession and storage of firearms in low-income urban families with at least one child between 8 and 12 years of age. The data primarily consisted of responses to a survey administered to parents, but these data were supplemented by records obtained from discussion groups composed of children between 8 and 12 years of age. The data were collected from five low-income neighborhoods in a medium sized city in the Pacific Northwest as part of a larger study focusing on the presence of risk factors for substance abuse, violence, and gang activity. All five neighborhoods are known to be plagued by poverty, violence, substance abuse, and gang activity. To make our findings more understandable, we compared our findings from these neighborhoods to similar data from a middle-class neighborhood. Middle-class parents were twice as likely to have firearms in their homes, but were much less likely to keep them loaded and/or unlocked. High rates of victimization, fear of crime, self-protective behavior, and exposure to threats or attacks were associated with keeping firearms for protection and engaging in risky gun behavior in the home. 相似文献
953.
954.
JOHN S.F. WRIGHT PAUL G. DEMPSTER JUSTIN KEEN PAULINE ALLEN ANDREW HUTCHINGS 《Public administration》2012,90(2):351-369
New governance arrangements for NHS Foundation Trusts (FTs) aimed to replace centralized state ownership of acute English hospitals with a new form of social ownership. Under this, trusts would exist as independent public interest organizations on the model of mutuals and co‐operative societies. Assessing the impact of the new arrangements on the management structure of four acute hospitals, we demonstrate that FTs have failed to deliver social ownership and local accountability on this model. We suggest that policy‐makers should re‐frame the governance apparatus associated with mutualism and social ownership in terms of the concept of meta‐regulation. By re‐framing governors as meta‐regulators, regulatory institutions would acquire new powers to steer FTs towards sustainable forms of compliance via non‐coercive, non‐intrusive means. 相似文献
955.
956.
The paper follows on from earlier work [Taroni F and Aitken CGG. Probabilistic reasoning in the law, Part 1: assessment of probabilities and explanation of the value of DNA evidence. Science & Justice 1998; 38: 165-177]. Different explanations of the value of DNA evidence were presented to students from two schools of forensic science and to members of fifteen laboratories all around the world. The responses were divided into two groups; those which came from a school or laboratory identified as Bayesian and those which came from a school or laboratory identified as non-Bayesian. The paper analyses these responses using a likelihood approach. This approach is more consistent with a Bayesian analysis than one based on a frequentist approach, as was reported by Taroni F and Aitken CGG. [Probabilistic reasoning in the law, Part 1: assessment of probabilities and explanation of the value of DNA evidence] in Science & Justice 1998. 相似文献
957.
958.
JACOB I. STOWELL STEVEN F. MESSNER KELLY F. MCGEEVER LAWRENCE E. RAFFALOVICH 《犯罪学》2009,47(3):889-928
A good deal of research in recent years has revisited the relationship between immigration and violent crime. Various scholars have suggested that, contrary to the claims of the classic Chicago School, large immigrant populations might be associated with lower rather than higher rates of criminal violence. A limitation of the research in this area is that it has been based largely on cross‐sectional analyses for a restricted range of geographic areas. Using time‐series techniques and annual data for metropolitan areas over the 1994–2004 period, we assess the impact of changes in immigration on changes in violent crime rates. The findings of multivariate analyses indicate that violent crime rates tended to decrease as metropolitan areas experienced gains in their concentration of immigrants. This inverse relationship is especially robust for the offense of robbery. Overall, our results support the hypothesis that the broad reductions in violent crime during recent years are partially attributable to increases in immigration. 相似文献
959.
960.
Terry-McElrath YM McBride DC Chriqui JF O'Malley PM Vanderwaal CJ Chaloupka FJ Johnston LD 《Crime and delinquency》2009,55(4):600-626
This article examines relationships between local drug policy (as represented by prosecutor-reported case outcomes for first-offender juvenile marijuana possession cases) and youth self-reported marijuana use, perceived risk, and disapproval. Interviews with prosecutors and surveys of 8th-, 10th-, and 12th-grade students in the United States were conducted in 2000. Analyses include data from 97 prosecutors and students from 127 schools in 40 states. Results indicate significant relationships between local drug policy and youth marijuana use and attitudes. In general, more-severe dispositions are associated with less marijuana use, higher disapproval rates, and increased perceptions of great risk. Associations primarily appear to be specific to marijuana-related outcomes. Results are discussed within the framework of both deterrence and broader social norms regarding substance use. 相似文献