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   8116篇
  免费   245篇
各国政治   307篇
工人农民   283篇
世界政治   575篇
外交国际关系   290篇
法律   5271篇
中国政治   66篇
政治理论   1521篇
综合类   48篇
  2020年   104篇
  2019年   134篇
  2018年   166篇
  2017年   186篇
  2016年   186篇
  2015年   136篇
  2014年   195篇
  2013年   778篇
  2012年   202篇
  2011年   208篇
  2010年   183篇
  2009年   183篇
  2008年   211篇
  2007年   251篇
  2006年   243篇
  2005年   198篇
  2004年   213篇
  2003年   228篇
  2002年   193篇
  2001年   334篇
  2000年   320篇
  1999年   244篇
  1998年   99篇
  1997年   92篇
  1996年   85篇
  1995年   82篇
  1994年   85篇
  1993年   72篇
  1992年   153篇
  1991年   163篇
  1990年   151篇
  1989年   168篇
  1988年   145篇
  1987年   169篇
  1986年   145篇
  1985年   165篇
  1984年   129篇
  1983年   148篇
  1982年   102篇
  1981年   103篇
  1980年   77篇
  1979年   110篇
  1978年   83篇
  1977年   71篇
  1976年   62篇
  1975年   55篇
  1974年   64篇
  1973年   64篇
  1971年   54篇
  1970年   50篇
排序方式: 共有8361条查询结果,搜索用时 15 毫秒
861.
862.
863.
Corporate actors can choose their corporate domicile and haveconsiderable freedom to choose terms in corporate charters.Although contractarian corporate law literature almost alwaysanalyzes the private choice of corporate law through the lensof agency costs, this article considers the choice for its informationalcontent. A particular law may be chosen by an entrepreneur notbecause it reduces agency costs, but because it signals qualityto outside investors. The article considers the choice of aDelaware domicile. Higher expected litigation costs for relativelylow quality firms that accompany a Delaware domicile could implythat choosing Delaware signals a relatively high quality firm.Alternatively, the size and structure of the franchise tax inDelaware could give rise to a signal of quality from locatingthere. The article considers the ambiguous welfare implicationsof the signaling analysis and the debate over mandatory versusenabling rules in corporate law. It also suggests how the signalinganalysis might apply to the debate over the private choice ofa securities regulation domicile.  相似文献   
864.
865.
Occasionally, partial calvariae of hydrocephalic calves are found in forensic contexts and mistakenly identified as human. Such specimens can be properly identified through immunological assessment of associated soft tissue, microscopic analysis of associated hair, and morphological comparison with documented museum specimens. Morphological comparison should focus on the form of the occiput, supraorbital grooves, and bulbous vault and presence of coronal processes.  相似文献   
866.
867.
Deoxyribonucleic acid (DNA) isolated from male and female fresh blood samples was processed exactly as for routine DNA fingerprint analysis; that is, the DNA was digested with particular restriction endonucleases and fractionated by agarose gel electrophoresis. Ultraviolet (UV) visualization of ethidium-bromide (EtBr)-stained gels revealed a sex-specific banding pattern, which depended only on the restriction enzyme used. By means of this test, which is based on direct detection of particular sex-specific restriction fragments in human DNA digests, the authors succeeded in determining the sex of DNA obtained from biological specimens recovered as criminal evidence in rape cases. The data obtained demonstrate that direct sexing of DNA on DNA fingerprint gel appears to be useful as an intermediate control step in DNA fingerprinting analysis used for the purpose of assailant identification.  相似文献   
868.
869.
A series of experiments were conducted using various types of pollen grain, powder and metal particulates to determine their persistence on a range of different types of materials. The decay curves generated in the repeated experiments all broadly conform to those obtained and already presented in the literature for fibres and glass particulates. The experiments presented in this paper were conducted for up to 647 hours for individual runs and it was found that a general rule existed that it was the material type rather than the particulate type that was the major controlling factor in the persistence of particles. For the pollen grain experiments the overall theory is sustained; there is a significant loss initially followed by a slower decay although this is not precise given the varied nature of palynomorph types. The manner by which the particulates were introduced onto the material had an initial immediate effect, however, the persistence of these particulates over longer periods of time was generally unaffected.  相似文献   
870.
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