全文获取类型
收费全文 | 23858篇 |
免费 | 695篇 |
专业分类
各国政治 | 1233篇 |
工人农民 | 884篇 |
世界政治 | 2095篇 |
外交国际关系 | 1062篇 |
法律 | 13468篇 |
中国共产党 | 2篇 |
中国政治 | 147篇 |
政治理论 | 5421篇 |
综合类 | 241篇 |
出版年
2021年 | 131篇 |
2020年 | 331篇 |
2019年 | 400篇 |
2018年 | 559篇 |
2017年 | 637篇 |
2016年 | 707篇 |
2015年 | 444篇 |
2014年 | 512篇 |
2013年 | 2708篇 |
2012年 | 607篇 |
2011年 | 645篇 |
2010年 | 523篇 |
2009年 | 551篇 |
2008年 | 674篇 |
2007年 | 721篇 |
2006年 | 681篇 |
2005年 | 604篇 |
2004年 | 631篇 |
2003年 | 619篇 |
2002年 | 560篇 |
2001年 | 836篇 |
2000年 | 752篇 |
1999年 | 661篇 |
1998年 | 383篇 |
1997年 | 336篇 |
1996年 | 292篇 |
1995年 | 272篇 |
1994年 | 325篇 |
1993年 | 298篇 |
1992年 | 431篇 |
1991年 | 455篇 |
1990年 | 412篇 |
1989年 | 421篇 |
1988年 | 407篇 |
1987年 | 386篇 |
1986年 | 423篇 |
1985年 | 386篇 |
1984年 | 343篇 |
1983年 | 357篇 |
1982年 | 291篇 |
1981年 | 281篇 |
1980年 | 204篇 |
1979年 | 281篇 |
1978年 | 204篇 |
1977年 | 176篇 |
1976年 | 149篇 |
1975年 | 142篇 |
1974年 | 168篇 |
1973年 | 132篇 |
1972年 | 128篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
141.
Federal transportation officials assert that labor protections in the Urban Mass Transportation Act inhibit the propensity of local transit agencies to contract with private firms for services. The authors present results from a survey of a large sample of transit managers and econometric analysis to support their conclusion that labor protections do not appear to reduce the incidence of contracting. The labor protections, however, may be costly to transit management in other ways. The authors recommend actions, aside from repeal of labor protections, to increase contracting by local transit agencies. 相似文献
142.
143.
144.
145.
146.
147.
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
148.
Using an interrupted time-series design, this research note analyzes the long-term effect of Minnesota's sentencing guidelines on reducing unwarranted disparity in sentencing outcomes that fall within their scope of authority. Unwarranted disparity is defined as residual variation not attributable to legally mandated sentencing factors. Findings suggest that although the sentencing guidelines initially reduced disparity for the no prison/prison sentencing decision, inequality began to revert to preguideline levels as time passed. Further analysis revealed that the guidelines had a permanent impact on reducing disparities in decisions on the length of prison sentence. Overall we observed an 18% decline in disparity for the no prison/prison outcome and a 60% reduction in inequality for the judicial decision as to length of prison sentence. Two explanations for the reversionary trend in the no prison/prison series are highlighted. 相似文献
149.
Michael Polakowski 《Journal of Quantitative Criminology》1994,10(1):41-78
The present paper operationalizes and empirically tests the most recent theoretical speculations of Hirschi and Gottfredson regarding an individual level characteristic of self-control and its relation to earlier specifications of control theory as well as the literature on personality. Linkages are drawn between their broad delineation of self-control and personal disorders of hyperactivity, impulsivity, attention deficits, and minor conduct problems. Psychologists disagree about whether such disorders represent single or multiple traits and whether both behavioral and cognitive measures can appropriately depict personality characteristics. Employing structural equation techniques, support for several propositions derived from Gottfredson and Hirschi's thesis is found: Self-control subsumes several personality disorders and is significantly comprised by early behavioral indicators of aggression and fighting, is inversely related to other elements of the social bond, is moderately stable over a short period of time, and significantly predicts criminal convictions. However, questions remain regarding the ubiquity of self-control, the magnitude and meaning of stability, and the power of this perspective to explain all forms of self-reported delinquency. 相似文献
150.