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   23950篇
  免费   516篇
各国政治   1015篇
工人农民   1528篇
世界政治   1446篇
外交国际关系   981篇
法律   13376篇
中国政治   115篇
政治理论   5851篇
综合类   154篇
  2021年   98篇
  2020年   200篇
  2019年   291篇
  2018年   1545篇
  2017年   1537篇
  2016年   1355篇
  2015年   325篇
  2014年   356篇
  2013年   1921篇
  2012年   539篇
  2011年   1268篇
  2010年   1307篇
  2009年   953篇
  2008年   1111篇
  2007年   1124篇
  2006年   433篇
  2005年   506篇
  2004年   611篇
  2003年   577篇
  2002年   466篇
  2001年   537篇
  2000年   481篇
  1999年   390篇
  1998年   253篇
  1997年   216篇
  1996年   236篇
  1995年   246篇
  1994年   242篇
  1993年   207篇
  1992年   312篇
  1991年   331篇
  1990年   295篇
  1989年   308篇
  1988年   285篇
  1987年   284篇
  1986年   324篇
  1985年   318篇
  1984年   286篇
  1983年   278篇
  1982年   195篇
  1981年   178篇
  1980年   150篇
  1979年   191篇
  1978年   123篇
  1977年   151篇
  1976年   121篇
  1975年   85篇
  1974年   102篇
  1973年   95篇
  1972年   92篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
102.
Comparison of a suspected biter's dental arches with the patterned injury of a bite mark is especially difficult when the bite occurs in an anatomic location with a small radius of curvature or with complex or compound curves. The authors present two case reports in which human skin was used as a template for the reproduction of a bite. In one case the victim's skin was used; in the other, the skin of a anatomically similar person was used. The use of inked dental casts, photography, and transparent overlays significantly reduced the errors common to analysis of bite marks in these highly curved areas.  相似文献   
103.
104.
105.
106.
107.
Development debates have been greatly influenced by the growth consensus: the conventional wisdom that economic growth should be the primary priority for less-developed countries (LDCs) because it most effectively improves the well-being of the world’s poor. We compare the impact of growth to other independent variables in an unbalanced panel analysis of up to 109 LDCs and 580 observations across six time points (1980, 1985, 1990, 1995, 2000, and 2003). Our dependent variables include caloric consumption, infant survival probability, one-to-five year survival probability, female life expectancy, and male life expectancy. First, we find that gross domestic product (GDP) has significant positive effects on caloric consumption, female life expectancy, and male life expectancy. Second, GDP does not have robust effects on infant and one-to-five survival probabilities. Third, fertility, urbanization, and secondary school enrollment have larger effects than GDP in the majority of models. The more powerful effects of fertility, urbanization, and secondary schooling cannot simply be attributed to an indirect effect of GDP. Fourth, we find that dependency variables do not have robust significant effects. Fifth, over time, GDP has become much less effective at improving caloric consumption and infant and one-to-five survival. We infer that there are serious limitations to concentrating exclusively on economic growth to improve well-being in LDCs.  相似文献   
108.
In the statistical interpretation of forensic glass evidence it is standard practice to make the assumption of homogeneity of the refractive index (RI) of the source glass, or of localized homogeneity. However, the work of Locke and Hayes showed that, for toughened windscreen glass, this assumption might not be true. This work is well cited, but there appears to have been little follow-on published research. Furthermore, the toughening process is something known to affect the refractive index, and is a process that float glass does not undergo. Float glass is a major component of casework in New Zealand and for that reason it would be interesting to know whether the findings of Locke and Hayes apply when dealing with float glass. In this paper we describe an experiment similar to that of Locke and Hayes, systematically examining the variation of RI in a pane of float window glass. It was found that, although there were no systematic differences in refractive index, there were observable differences across the pane.  相似文献   
109.
This article argues that, despite environmental issues climbing higher on the political agenda and considerable recent policy activity, rhetoric is not matched by reality in our efforts to manage the Australian environment. We integrate the imperatives emerging from the policy and sustainability literatures and from actual policy, with detailed work on wildlife conservation in Victoria's Central Highlands. Our analysis demonstrates that, rather than undertaking the more intensive policy and 'adaptive management' that is needed, governments are often doing less and may actually be 'taking their hands of their wheel'. Some public policy and administration implications of the emerging policy field of sustainability are illustrated.  相似文献   
110.
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