全文获取类型
收费全文 | 18428篇 |
免费 | 523篇 |
专业分类
各国政治 | 794篇 |
工人农民 | 715篇 |
世界政治 | 1569篇 |
外交国际关系 | 709篇 |
法律 | 10832篇 |
中国共产党 | 3篇 |
中国政治 | 92篇 |
政治理论 | 4044篇 |
综合类 | 193篇 |
出版年
2021年 | 95篇 |
2020年 | 250篇 |
2019年 | 309篇 |
2018年 | 384篇 |
2017年 | 455篇 |
2016年 | 479篇 |
2015年 | 338篇 |
2014年 | 398篇 |
2013年 | 1876篇 |
2012年 | 460篇 |
2011年 | 477篇 |
2010年 | 384篇 |
2009年 | 433篇 |
2008年 | 494篇 |
2007年 | 506篇 |
2006年 | 480篇 |
2005年 | 439篇 |
2004年 | 440篇 |
2003年 | 451篇 |
2002年 | 422篇 |
2001年 | 706篇 |
2000年 | 639篇 |
1999年 | 523篇 |
1998年 | 302篇 |
1997年 | 260篇 |
1996年 | 212篇 |
1995年 | 225篇 |
1994年 | 248篇 |
1993年 | 229篇 |
1992年 | 348篇 |
1991年 | 377篇 |
1990年 | 333篇 |
1989年 | 354篇 |
1988年 | 322篇 |
1987年 | 338篇 |
1986年 | 348篇 |
1985年 | 336篇 |
1984年 | 288篇 |
1983年 | 319篇 |
1982年 | 259篇 |
1981年 | 240篇 |
1980年 | 181篇 |
1979年 | 251篇 |
1978年 | 168篇 |
1977年 | 147篇 |
1976年 | 133篇 |
1975年 | 120篇 |
1974年 | 137篇 |
1973年 | 121篇 |
1972年 | 112篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
111.
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
112.
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
113.
114.
115.
Threatening and otherwise inappropriate letters to members of the United States Congress 总被引:2,自引:0,他引:2
P E Dietz D B Matthews D A Martell T M Stewart D R Hrouda J Warren 《Journal of forensic sciences》1991,36(5):1445-1468
The authors examine the characteristics of threatening and otherwise inappropriate communications sent to members of the U.S. Congress by a sample of 86 subjects, 20 of whom threatened assassination. We quote excerpts from these letters and provide quantitative data on such variables as the volume, duration, form, and appearance of such communications; the enclosures; the subjects' perceived relationships to the recipients; the thematic content of the communications; and the messages and threats communicated. Comparisons between 43 subjects who pursued encounters with members of Congress and 43 who did not revealed 17 factors associated with such pursuit. In this population, threateners were significantly less likely to pursue an encounter than inappropriate letter writers who did not threaten, regardless of the type of threat or the harm threatened. Inappropriate letters to members of Congress are compared with those directed to Hollywood celebrities. Mentally disordered persons writing to public figures often mention and sometimes threaten public figures other than those to whom the letters are addressed, which raises important issues regarding notification of endangered third parties and the sharing of information among protective agencies. 相似文献
116.
Benjamin J. Cohen 《国际研究展望》2003,4(3):275-292
With the rapid growth of cross-border competition among currencies, informed observers predict that the new monetary unions are virtually inevitable in many parts of the world. In fact, predictions of such alliances are misleading and almost certainly wrong. Monetary unions necessarily imply a measure of collective action in the issue and management of money. An alliance requires allies—other states with similar preferences and a disposition to act cooperatively. A survey of proposed monetary unions shows that willing partners among sovereign states are just not all that plentiful. Conceivably some governments could be attracted to less demanding forms of monetary alliance, depending on bargaining context. But prospects for many full new monetary unions are dim at best. 相似文献
117.
118.
R. CHRISTOPHER SPICER CIH CHMM HARRY J. GANGLOFF PH.D. Neil Feldscher CIH CSP 《环境索赔杂志》2005,17(1):13-28
Bioaerosol data is often used in cases of building mold infestation alleging damage or adverse health effects upon occupants, despite the lack of consistent sampling and analytical protocols and numerical health-based standards. The most fundamental problem in these scenarios is defining a “significant” difference between a suspect indoor environment and the reference environment, regardless of the type of sampling and analysis utilized. Data interpretation focused upon differences in absolute numerical concentrations of fungi is subject to wide differences in expert opinion. On the other hand, an objective quantification of differences can be expressed in terms of probability and better meets criteria established in evidentiary rules. 相似文献
119.
Christopher Birkbeck 《European Journal on Criminal Policy and Research》2005,11(3-4):321-346
Crime prevention is an activity that, sooner or later, requires the concourse of science. But the dictates of science may
not mesh well with the social, institutional and political considerations that are persistent and powerful determinants of
collective action. To the extent that they are ignored, crime prevention is less scientific and more pragmatic. Using a marketing
metaphor, this paper examines selected aspects of the supply of and demand for scientific crime prevention in Canada and Venezuela
from 1949 to the present. In both countries, academic entrepreneurs are revealed to be a necessary factor in the sale of crime
prevention to government. On the demand side, governments adopt and adapt crime prevention policies in relation to their broader
perspective on social problems and social change. However, rising crime rates and climates of urgency reduce the attractiveness
of crime prevention. Scientific crime prevention is easier to sell when crime rates are stable or declining. 相似文献
120.
Edward J. Keall 《British Journal of Middle Eastern Studies》2005,32(2):249-292