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   10483篇
  免费   547篇
各国政治   419篇
工人农民   355篇
世界政治   807篇
外交国际关系   300篇
法律   7071篇
中国共产党   1篇
中国政治   54篇
政治理论   1983篇
综合类   40篇
  2021年   60篇
  2020年   192篇
  2019年   234篇
  2018年   231篇
  2017年   292篇
  2016年   295篇
  2015年   245篇
  2014年   268篇
  2013年   987篇
  2012年   234篇
  2011年   302篇
  2010年   287篇
  2009年   300篇
  2008年   285篇
  2007年   257篇
  2006年   273篇
  2005年   248篇
  2004年   248篇
  2003年   232篇
  2002年   237篇
  2001年   464篇
  2000年   420篇
  1999年   293篇
  1998年   183篇
  1997年   150篇
  1996年   126篇
  1995年   118篇
  1994年   145篇
  1993年   133篇
  1992年   197篇
  1991年   217篇
  1990年   203篇
  1989年   212篇
  1988年   204篇
  1987年   190篇
  1986年   231篇
  1985年   206篇
  1984年   159篇
  1983年   169篇
  1982年   112篇
  1981年   120篇
  1980年   85篇
  1979年   131篇
  1978年   74篇
  1977年   73篇
  1976年   69篇
  1974年   73篇
  1973年   66篇
  1972年   66篇
  1970年   46篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
981.
During the post-war negotiations in the years of 1945 and 1946, the Soviets launched a bitter war of nerves against Turkey in order to establish a military base in Istanbul and share control of the Straits. It was crucial for Britain that the USSR be prevented from gaining any influence in Turkey. However, as Britain was in no position to support Turkey financially, American authorities encouraged by London and Ankara took over the responsibility for Turkey. This articles examines the Great Powers rivalry over Turkey and Turkey’s response to it. It argues that regional factors other than US–Soviet confrontation, such as Turkey’s security search against the Soviets, also played a crucial part in starting the Cold War in the Near East.  相似文献   
982.
983.
984.
985.
986.
987.
In this article we incorporate notions of the fairness of sanctionsinto the standard model of public enforcement. When both theprobability and magnitude of sanctions may be varied, the usualsolution involves a very high sanction and a relatively lowprobability of enforcement if individuals are risk neutral.When the issue of fairness is added to the analysis, the optimalsanction generally is not extremely high because such a sanctionwould be seen as unfair. The optimal probability of imposingsanctions may be higher than in the usual case (to offset thelower sanction) or lower than in the usual case (because thelower sanction reduces the effectiveness of enforcement).  相似文献   
988.
The current study used a person-oriented approach to examine the participation of adolescents in both constructive, organized activities as well as relaxed leisure activities. The goal of this research was to identify different profiles of involvement in activities and the relations to psychosocial indicators for these differing groups. Activity profiles were created using cluster analytic techniques for 918 adolescents' responses in 11 activity domains. The groups were found to be both statistically and substantively unique and consistent with findings from previous research. Further, the groups showed meaningful and consistent differences across a range of psychosocial indicators, including academic performance, problem behavior, and mental health. Results indicated that adolescents' activity involvement was related to their psychological and behavioral functioning and that the profiles of participation across activity settings provide a more holistic view of teens' choices than do single variable models.  相似文献   
989.
A statistical investigation of the relationship between firing range and the amount and distribution of gunshot residue (GSR), used automated image analysis (IA) to quantify GSR deposit resulting from firings into pig skin, from distances ranging between contact and 45 cm. Overall, for a Ruger .22 semi-automatic rifle using CCI solid point, high velocity ammunition, the total area of GSR deposit on the skin sections decreased in a non-linear fashion with firing range. More specifically there were significant differences in the amount of GSR deposited from shots fired at contact compared with shots fired from distances between 2.5 and 45 cm; and between shots fired from a distance of 20 cm or less, with shots fired at a distance of 30 cm or more. In addition, GSR particles were heavily concentrated in the wound tract only for contact and close range shots at 2.5 cm, while the particle distribution was more uniform between the wound tract and the skin surfaces for shots fired from distances greater than 2.5 cm. Consequently, for future scientific investigations of gunshot fatalities, once standards have been established for the weapon and ammunition type in question, image analysis quantification of GSR deposited in and around the gunshot wound may be capable of providing a reliable, statistical basis for estimating firing range.  相似文献   
990.
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