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   17444篇
  免费   519篇
各国政治   711篇
工人农民   724篇
世界政治   1468篇
外交国际关系   679篇
法律   10396篇
中国共产党   2篇
中国政治   80篇
政治理论   3729篇
综合类   174篇
  2020年   216篇
  2019年   256篇
  2018年   333篇
  2017年   396篇
  2016年   429篇
  2015年   296篇
  2014年   340篇
  2013年   1709篇
  2012年   415篇
  2011年   444篇
  2010年   354篇
  2009年   397篇
  2008年   463篇
  2007年   499篇
  2006年   471篇
  2005年   410篇
  2004年   416篇
  2003年   430篇
  2002年   390篇
  2001年   685篇
  2000年   624篇
  1999年   514篇
  1998年   290篇
  1997年   248篇
  1996年   209篇
  1995年   208篇
  1994年   249篇
  1993年   226篇
  1992年   344篇
  1991年   370篇
  1990年   332篇
  1989年   344篇
  1988年   318篇
  1987年   336篇
  1986年   337篇
  1985年   334篇
  1984年   287篇
  1983年   317篇
  1982年   256篇
  1981年   242篇
  1980年   179篇
  1979年   248篇
  1978年   168篇
  1977年   145篇
  1976年   130篇
  1975年   120篇
  1974年   137篇
  1973年   120篇
  1972年   113篇
  1971年   97篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
111.
112.
In order to cooperate with voluntary screening programs aimed at the surveillance of the HIV epidemic in Finland, we have studied medicolegal autopsies for HIV antibodies since 1986 using an enzyme immunoassay on postmortem sera. The investigation covered 47.4% and 39.2%, respectively, of all deaths under the age of 65 years in the metropolitan areas of Helsinki and Turku--two cities on the densely populated southern coast of Finland from which most HIV infections have thus far been detected. Nine HIV-positive cases (0.12%) were detected among the 7305 medicolegal autopsies tested in 1986 to 1990. This figure is higher than the prevalence of 0.01 to 0.03% in voluntary screening programs for the general population would suggest. Seven of our cases had previously tested positive, and two were previously unknown cases, indicating that people at high risk are clustered in the medicolegal autopsy series. Of the six cases in an early stage of infection, three committed suicide suggesting the importance of HIV-screening in suicide cases in tracing symptomless HIV carriers. Five of the cases were detected in 1990, a year when the number of new HIV infections had more than doubled compared to the previous two years. This suggests that testing of medicolegal autopsies as surrogate tests for the population gives useful information even in low-prevalence areas like Finland. Such testing has none of the ethical problems of many other back-up surveys, and may be particularly sensitive to early changes in epidemiology.  相似文献   
113.
The conflict and animosity that sometimes accompanies child custody disputes can give rise to the propagation of allegations of child sexual abuse. To characterize the magnitude of the problem, the present study attempted to determine whether and to what extent child sexual abuse allegations predominate in family court litigation. The entire one-year caseload of a county family court docket was systematically reviewed and coded. Methodical evaluation of 603 family court files yielded base rates of pertinent allegations and other information profiling the cases. The findings did not support the contention that sexual abuse allegations are commonplace in child custody disputes. Sexual abuse allegations were made in 2% of cases in which custody or access was contested and in only 0.8% of the cases overal. Implications of the findings for future research were discussed.The authors gratefully acknowledge the assistance of the Honorable William R. Campbell and Barbara Scott, Clerk of Court for the South Carolina Fifth Judicial Circuit, as well as the contributions of Angie Newton, Frank Robinson, and Kimberly Ellis in the data collection process.  相似文献   
114.
115.
116.
117.
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   
118.
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   
119.
120.
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