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   20803篇
  免费   689篇
  国内免费   5篇
各国政治   823篇
工人农民   933篇
世界政治   1405篇
外交国际关系   742篇
法律   13292篇
中国共产党   6篇
中国政治   179篇
政治理论   3917篇
综合类   200篇
  2020年   271篇
  2019年   343篇
  2018年   438篇
  2017年   505篇
  2016年   519篇
  2015年   358篇
  2014年   399篇
  2013年   1949篇
  2012年   552篇
  2011年   603篇
  2010年   480篇
  2009年   521篇
  2008年   596篇
  2007年   653篇
  2006年   640篇
  2005年   554篇
  2004年   561篇
  2003年   586篇
  2002年   496篇
  2001年   818篇
  2000年   720篇
  1999年   597篇
  1998年   297篇
  1997年   229篇
  1996年   256篇
  1995年   224篇
  1994年   259篇
  1993年   243篇
  1992年   412篇
  1991年   443篇
  1990年   455篇
  1989年   389篇
  1988年   440篇
  1987年   383篇
  1986年   408篇
  1985年   372篇
  1984年   300篇
  1983年   289篇
  1982年   227篇
  1981年   244篇
  1980年   174篇
  1979年   224篇
  1978年   158篇
  1977年   131篇
  1976年   131篇
  1975年   151篇
  1974年   168篇
  1973年   130篇
  1972年   119篇
  1970年   117篇
排序方式: 共有10000条查询结果,搜索用时 62 毫秒
21.
22.
23.
24.
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   
25.
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   
26.
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   
27.
28.
Having found that a deep hyperlink on Davis' website to livestreaming of a motorcycle race owned by Live Nation constitutescopying, the court granted Live Nation's Motion for summaryjudgment in its copyright infringement claim and enjoined Davisfrom maintaining the link.  相似文献   
29.
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   
30.
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   
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