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   67694篇
  免费   3274篇
各国政治   4442篇
工人农民   2845篇
世界政治   5885篇
外交国际关系   3784篇
法律   31723篇
中国共产党   12篇
中国政治   752篇
政治理论   20573篇
综合类   952篇
  2021年   401篇
  2020年   1159篇
  2019年   1519篇
  2018年   1654篇
  2017年   1959篇
  2016年   2167篇
  2015年   1815篇
  2014年   2089篇
  2013年   10453篇
  2012年   1601篇
  2011年   1702篇
  2010年   1816篇
  2009年   2059篇
  2008年   1748篇
  2007年   1703篇
  2006年   1877篇
  2005年   1764篇
  2004年   1662篇
  2003年   1451篇
  2002年   1508篇
  2001年   1451篇
  2000年   1300篇
  1999年   1152篇
  1998年   1097篇
  1997年   978篇
  1996年   959篇
  1995年   911篇
  1994年   910篇
  1993年   941篇
  1992年   958篇
  1991年   996篇
  1990年   923篇
  1989年   966篇
  1988年   947篇
  1987年   991篇
  1986年   950篇
  1985年   1021篇
  1984年   925篇
  1983年   986篇
  1982年   885篇
  1981年   834篇
  1980年   649篇
  1979年   683篇
  1978年   589篇
  1977年   536篇
  1976年   485篇
  1975年   411篇
  1974年   411篇
  1973年   432篇
  1972年   376篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
151.
152.
人离体肝组织胺类产生与死亡时间和环境温度的关系   总被引:3,自引:1,他引:2  
目的探讨在不同环境温度下,人离体肝组织中有机胺类产生量随死亡时间变化的规律,为某些碎尸案的死亡时间推断提供参考资料。方法应用高效液相色谱仪外标法,动态检测人离体肝组织中组胺、腐胺、尸胺和未腐败氨基酸含量。结果在8℃、15℃、23℃和32℃环境下,有机胺类产生量分别于人死后肝脏即刻离体69h、54h、40h和33h趋于最大值,并且在到达峰值之前,各温度组离体肝组织中有机胺类生成量均与死亡时间成正比关系。结论人离体肝组织中有机胺类产生量与死亡时间和环境温度在一定范围内均呈正相关。  相似文献   
153.
第三代领导集体依据当代世界、社会主义和中国发展的实际 ,全面地丰富和发展了邓小平理论。在这种丰富和发展中 ,世界眼光始终贯穿其中 ,体现了理论与现实的统一、世界性与民族性的统一、顺应性与主动性的统一、一般性与个别性的统一、发展的阶段性与无限性的统一。  相似文献   
154.
155.
Legal context: The relatively informal agreements setting up the TrilateralCooperation (TC) among the world's three most important patentoffices are contrasted with formal multinational treaties suchas the Patent Law Treaty and the abortive Substantive PatentLaw Treaty. Key points: After its inception in 1983, the TC concentrated initially ondeveloping and implementing standards for electronic storageand retrieval of prior art documents, and facilitation of searching.This was later extended to electronic sharing of priority documentsand to standardization and searching of DNA sequence databases.More recently emphasis has been placed on harmonization of searchingand examination procedures, and working groups have comparedthe approaches of the Trilateral Offices (TOs) to the patentabilityof claims in areas of new technology. Encouragingly, the resultsare usually the same, although the specific objections raisedmay differ. The ultimate goal is to reach a situation in whicha claim allowed by one TO would be accepted by the others withoutfurther examination. Practical significance: The TC has already facilitated search and examination, leadingto lower costs and shorter pendency times than would otherwisebe the case. Further progress depends on harmonization of substantivepatent law, which in turn depends on the willingness of theUSA to accept a first-to-file system.  相似文献   
156.
This article provides an editorial introduction to the following three related articles on the growing use and influence of social science research in family law. It first considers why this has become problematic and identifies some common strategies used by advocates, sometimes under the guise of scholarship, to destroy the standing of research findings contrary to their ideological or political position. Then it discusses briefly the remedies proposed to mitigate these kinds of problems within the following three articles.  相似文献   
157.
This article summarizes some of the literature reviewed by the Girls Study Group, which is a federally funded project aimed at assessing the causes of girls’ delinquency as well as evaluating programs to address it. The literature reveals that a number of factors such as family dysfunction, involvement with antisocial peers, and living in disadvantaged neighborhoods are correlated with delinquency for both boys and girls. Some factors, however, are gender sensitive, meaning that either girls are more exposed to a given risk factor than boys or react somewhat differently to a given risk factor. Girls have higher rates of exposure to sexual assault, which is associated with delinquency and, although more research is needed, they are more affected by the impacts of early puberty, when it is coupled with harsh parenting and disadvantaged neighborhoods. This article discusses some implications of the research on correlates of delinquency for programming for girls and makes recommendations for program selection.  相似文献   
158.
The American Law Institute proposes that in contested physical custody cases the court should allocate to each parent a proportion of the child's time that approximates the proportion of time each has spent performing caretaking functions in the past. Examined through the lens of child development research, the approximation rule is unlikely to improve on the best interests standard. It is difficult to apply; is perceived as gender‐biased; creates a new focus for disputing parents; renders a poor estimate of parents’ contributions to their child's best interests; overlooks parents’ intangible, yet significant, contributions to their child's well‐being; and miscalculates the essence of how a child experiences the family. A preferable alternative is a better defined, contemporary best interests standard that accommodates new knowledge and reforms that encourage nonadversarial, individualized resolutions of custody disputes.  相似文献   
159.
160.
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