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   21309篇
  免费   572篇
各国政治   875篇
工人农民   843篇
世界政治   1707篇
外交国际关系   771篇
法律   12912篇
中国共产党   3篇
中国政治   100篇
政治理论   4464篇
综合类   206篇
  2020年   261篇
  2019年   323篇
  2018年   419篇
  2017年   489篇
  2016年   515篇
  2015年   345篇
  2014年   423篇
  2013年   2079篇
  2012年   503篇
  2011年   554篇
  2010年   439篇
  2009年   496篇
  2008年   559篇
  2007年   570篇
  2006年   552篇
  2005年   473篇
  2004年   499篇
  2003年   512篇
  2002年   452篇
  2001年   835篇
  2000年   776篇
  1999年   630篇
  1998年   351篇
  1997年   293篇
  1996年   247篇
  1995年   252篇
  1994年   297篇
  1993年   267篇
  1992年   436篇
  1991年   457篇
  1990年   438篇
  1989年   440篇
  1988年   430篇
  1987年   445篇
  1986年   419篇
  1985年   415篇
  1984年   354篇
  1983年   380篇
  1982年   292篇
  1981年   280篇
  1980年   217篇
  1979年   291篇
  1978年   196篇
  1977年   166篇
  1976年   157篇
  1975年   142篇
  1974年   172篇
  1973年   143篇
  1972年   126篇
  1971年   114篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
11.
In many states, legal representation for parents of dependent children is inadequate and can be a source of delays in securing permanency for children and unnecessarily protracted court proceedings. Often, such parents also face barriers to accessing services and independent evaluators. These issues are being addressed in the state of Washington through two approaches. The first is a successful enhanced legal representation program that has substantially improved case outcomes. The second is a statewide committee using innovative means to examine systemic responses to the challenges of the Adoption and Safe Families Act.  相似文献   
12.
13.
Fibres used in forensic casework suffer from a disadvantage common to other forms of trace evidence--it is not possible to state with absolute certainty that they originate from a specific source. Target fibre studies, population studies and research on 'blocks of colour' have effectively demonstrated the polymorphism of textile fibres (particularly man-made ones) and have shown that when a fibre is believed to have a specific putative source, the chance that it has originated from a different source purely by coincidence is extremely remote. A study by Houck MM (Houck MM, Inter-comparison of unrelated fibre evidence. Forensic Science International 2003; 135: 146-149) has shown that no coincidental matching fibres were recovered from items of clothing examined in 20 unrelated crimes. The study involved over two million comparisons. This work goes a step further, and using the example of blue polyester fibres shows that even within a very narrow segment of the whole general fibre population, many examples of a specific colour/type of man-made fibre taken from random sources can be compared and the chance of any two being the same is very low. These studies should help to show the specificity and value of transferred fibres in providing forensic evidence.  相似文献   
14.
15.
16.
17.
Das Bundesverwaltungsgericht hat in seinem Urteil vom 16.3.2006 zum Gro?flughafen Berlin-Brandenburg in einem Leitsatz festgestellt, dass das FFH-Schutzregime, dem bestimmte Biotope unterliegen, sich nicht auf V?gel erstreckt, denen das betreffende Biotop als Habitat dient. Diese Feststellung führt zu der Frage, inwieweit charakteristische Arten von Lebensr?umen nach Anhang I FFH-RL in der FFH-Vertr?glichkeitsprüfung nach § 34 BNatSchG überhaupt bewertungsrelevant sind. Der Beitrag setzt sich dazu mit dem Urteil kritisch auseinander.  相似文献   
18.
This article tests cross-nationally the minority group threat thesis that public sentiments toward repressive crime-control policies reflect conflicted racial and ethnic relations. Using multiple data sets representing France, Belgium, the Netherlands, East and West Germany, Italy, Luxembourg, Denmark, Great Britain, Greece, Spain, Finland, Sweden, Austria, Canada, Ireland, and Portugal, we examine whether racial and ethnic intolerance—animus, resentments, or negative sentiments toward minorities—predicts greater support for the death penalty. Our results reveal that the respondents were significantly more likely to express support for capital punishment if they were racially or ethnically intolerant while controlling for other covariates of public opinion. These findings indicate that the link between support for capital punishment and racial and ethnic animus may occur universally in countries with conflicted racial and ethnic relations.  相似文献   
19.
A method has been developed on reverse phase high performance liquid chromatography for simultaneous determination of methyl, ethyl and isopropyl alcohols under refractive index detection using pure water as the mobile phase. A good separation has been achieved between these alcohols. Detector response was linear with a detection limit of 5 mg/100 ml. Recovery studies were performed by adding known amounts of methyl and ethyl alcohols to blood, lung and liver within the range 80–90%. The reproducibility of the results was always >90%. The quantitative distribution of methyl alcohol in postmortem body tissues and fluids has been reported in three cases of poisoning.  相似文献   
20.
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