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   3681篇
  免费   227篇
各国政治   368篇
工人农民   220篇
世界政治   437篇
外交国际关系   258篇
法律   1882篇
中国共产党   3篇
中国政治   16篇
政治理论   697篇
综合类   27篇
  2023年   54篇
  2022年   35篇
  2021年   72篇
  2020年   119篇
  2019年   157篇
  2018年   193篇
  2017年   258篇
  2016年   220篇
  2015年   151篇
  2014年   206篇
  2013年   629篇
  2012年   183篇
  2011年   159篇
  2010年   95篇
  2009年   88篇
  2008年   141篇
  2007年   149篇
  2006年   122篇
  2005年   108篇
  2004年   116篇
  2003年   107篇
  2002年   82篇
  2001年   70篇
  2000年   67篇
  1999年   35篇
  1998年   33篇
  1997年   28篇
  1996年   15篇
  1995年   23篇
  1994年   16篇
  1993年   17篇
  1992年   17篇
  1991年   15篇
  1990年   9篇
  1989年   9篇
  1988年   7篇
  1987年   9篇
  1985年   7篇
  1984年   7篇
  1983年   7篇
  1982年   6篇
  1978年   5篇
  1975年   4篇
  1974年   6篇
  1972年   6篇
  1971年   4篇
  1968年   4篇
  1967年   6篇
  1966年   5篇
  1965年   4篇
排序方式: 共有3908条查询结果,搜索用时 15 毫秒
191.
“Albeit democratic, their coat of arms has pride of place”. Thus Romualdo Nogués defined, in 1890, Spanish collectors of bourgeois origin who had joined the ranks of the aristocracy. A few years later, in 1924, the Duke of Alba’s maiden speech at the Academia de Bellas Artes de San Fernando justified his personal artistic worthiness on the basis of his ancestors’ collecting activities and the artworks they had amassed.

These two examples set the scene for the research questions studied in this monographic issue. The present introduction offers a bird’s eye view of the phenomenon and continues with a few remarks about the House of Osuna which, as is well known, occupied a pivotal position in Spanish nobility during the whole of the second half of the nineteenth century.  相似文献   

192.
193.
194.
195.
196.
This ecological study examined the association between seven socioeconomic indicators (GDP, unemployment rate, female labor force participation rate, alcohol expenditure, marriage rate, percentage of births outside of marriage, and indictable crime rate) and total, male, and female rates of suicide and suicide plus undetermined death in Ireland during the period 1968-2000. Analysis of the data expressed as absolute values showed highly significant associations between the socioeconomic indicators and the total, male, and female suicide rates. However, these associations were explained by the strongly trended data. The trended nature of the data was removed by using year-to-year differences. Analysis of the first-differenced data showed that none of the socioeconomic indicators was associated with the total, male, or female suicide rates with the exception of indictable crime, which had a significant independent effect on the female suicide rate (coefficient = 2.0, p < .01) but not on suicide plus undetermined death. This study highlights the need to use econometric methods in time-trend analyses, the lack of age-sex specific exposure data in this area, and the challenge of understanding trends in suicide in their socioeconomic context.  相似文献   
197.
198.
A clear positive case for anabolic steroids doping was confounded by alleged urine tampering during doping control procedures. Review of the chain of custody showed no flaws, but nevertheless the athlete was adamant that the urine sample should be analyzed for DNA in order to support her contention that she was not the donor of the sample. The results obtained showed that the urine sample that scored positive for steroids contained nuclear DNA that could not be matched to the DNA obtained from the athlete's blood. On the other hand, the same urine sample contained mitochondrial DNA whose nucleotide sequences spanning the hyper variable regions HV1 and HV2 proved to be identical to those determined in mitochondrial DNA amplified from the athlete's blood. The occurrence of an extraneous genotype is compatible with exogenous nuclear DNA admixture to the athlete's urine. Alternatively, taking in consideration the mitochondrial DNA, we could not exclude that a sibling or a maternal relative of the athlete could have acted as a donor of the urine utilized for doping control and DNA analysis. Both situations point to possible tampering of the urine by the athlete. Adjudication at CAS maintained previous national and international federation decision that there was no proof of a chain of custody flaw to justify the athlete's allegation of urine substitution after collection.  相似文献   
199.
Scanning electron microscopy analysis of experimental bone hacking trauma   总被引:2,自引:0,他引:2  
The authors report on their macro- and microscopy study of bone lesions made by a sharp force instrument (a single blade knife), and a sharp-blunt instrument classified as a chopping weapon (a hatchet). The aim of this work was to attempt to identify the instrument by analyzing the general class characteristics of the cuts. Each weapon was used on human bones. The results indicate that macroscopic analysis is more problematic. The microscopic analysis assessed that characteristics examined were effective in distinguishing sharp from sharp-blunt injury to the bone. The microscope facilitates analysis unachievable with macroscopic methods, some three-dimensional characteristics not visible to the naked eye being clearly defined with its use. Emphasis has been placed on the value of SEM as an anthropologist's tool in bone lesion injuries.  相似文献   
200.
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