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   19943篇
  免费   759篇
各国政治   1111篇
工人农民   730篇
世界政治   1368篇
外交国际关系   774篇
法律   12698篇
中国共产党   7篇
中国政治   126篇
政治理论   3781篇
综合类   107篇
  2020年   300篇
  2019年   362篇
  2018年   494篇
  2017年   521篇
  2016年   542篇
  2015年   429篇
  2014年   447篇
  2013年   2086篇
  2012年   465篇
  2011年   497篇
  2010年   501篇
  2009年   544篇
  2008年   549篇
  2007年   578篇
  2006年   585篇
  2005年   452篇
  2004年   492篇
  2003年   450篇
  2002年   404篇
  2001年   823篇
  2000年   698篇
  1999年   584篇
  1998年   272篇
  1997年   216篇
  1996年   189篇
  1995年   191篇
  1994年   207篇
  1993年   182篇
  1992年   362篇
  1991年   410篇
  1990年   378篇
  1989年   376篇
  1988年   355篇
  1987年   397篇
  1986年   354篇
  1985年   339篇
  1984年   301篇
  1983年   297篇
  1982年   214篇
  1981年   222篇
  1980年   150篇
  1979年   286篇
  1978年   188篇
  1977年   146篇
  1976年   128篇
  1975年   154篇
  1974年   169篇
  1973年   182篇
  1972年   133篇
  1971年   123篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
This paper reports results of a study based on a nationally representative sample of U.S. youth (N = 11,549) that asked two questions: (1) How does family structure affect the likelihood of adolescent death beyond that of race/ethnicity, sex, socioeconomic status, personal behavior, and other structural factors and (2) under what conditions might appeals for social justice be warranted for relative mortality statuses and for absolute gains in mortality? The study found that marital instability increases the likelihood of dying when controlling for a variety of other factors including class, race/ethnicity, sex, and unemployment rate in area of residence. The author argues that this finding lends support to social justice arguments to redistribute resources in such a way as to ensure the likelihood of absolute gains in mortality. The study also found, however, that race/ethnicity/sex also accounted for the likelihood of dying independently of family structure when controlling for socioeconomic and other factors. The author argues that this finding lends support to social justice arguments to redistribute resources on the basis of relative mortality statuses.  相似文献   
32.
Restriction fragment length polymorphism (RFLP) analysis for the purpose of individualization is now being used in casework in the People's Republic of China. This report describes the use of the multilocus minisatellite probe 33.15 to solve three cases, including two homicides and a rape. In the third case, fetal tissue was analyzed to prove that the alleged rapist was, in fact, the father. In each case, analysis of deoxyribonucleic acid (DNA) resulted in a positive match. The probability of chance association of the DNA fingerprint was calculated as 5.6 x 10(-12), which is similar to the figures reported in the literature.  相似文献   
33.
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   
34.
35.
36.
37.
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   
38.
Past research has largely ignored the developmental changes within the child that account for the association between parenting and risk for delinquency. We used structural equation modeling and data from a longitudinal study of several hundred African‐American families to test the contentions of various theories regarding the sociocognitive and emotional factors that mediate the impact of parental behavior on a youth's risk for delinquency. Our findings largely supported the theories. The impact of monitoring/discipline was indirect through low self‐control and acceptance of deviant norms, whereas the effect of hostility/ rejection was indirect through low self‐control, hostile view of relationships, and acceptance of deviant norms. These two dimensions of parenting were no longer related either to affiliation with deviant peers or to conduct problems once the effects of these psychological characteristics were taken into account; the impact of these parenting practices was completely mediated by these four cognitive/affective variables. Contrary to expectation, however, these psychological factors did not mediate any of the relationship between caretaker involvement in antisocial behavior and child conduct problems.  相似文献   
39.
40.
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