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   10832篇
  免费   532篇
  2020年   175篇
  2019年   251篇
  2018年   336篇
  2017年   301篇
  2016年   386篇
  2015年   254篇
  2014年   242篇
  2013年   3027篇
  2012年   313篇
  2011年   343篇
  2010年   324篇
  2009年   311篇
  2008年   281篇
  2007年   272篇
  2006年   235篇
  2005年   154篇
  2004年   143篇
  2003年   147篇
  2002年   146篇
  2001年   205篇
  2000年   151篇
  1999年   165篇
  1998年   130篇
  1997年   111篇
  1996年   116篇
  1995年   107篇
  1994年   97篇
  1993年   101篇
  1992年   110篇
  1991年   89篇
  1990年   90篇
  1989年   80篇
  1988年   88篇
  1987年   100篇
  1986年   91篇
  1985年   117篇
  1984年   120篇
  1983年   127篇
  1982年   118篇
  1981年   105篇
  1980年   108篇
  1979年   89篇
  1978年   101篇
  1977年   106篇
  1976年   89篇
  1975年   87篇
  1974年   74篇
  1973年   58篇
  1972年   54篇
  1971年   58篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
52.
53.
Three rare Himyaritic coins found in the territory of the ancient Hadramawt kingdom are published for the first time. Two of the coins bear the name of the king,'Amdan Bayyin, while the third has the name of Tha'ran Ya'ub.  相似文献   
54.
55.
This paper puts into focus the regional implications of China's recent open-door policy. The empirical analysis employs a cross-sectional approach with 1986 data. The results suggest that foreign trade is more readily translated into economic development in the most well developed and industrialized eastern coastal provinces.  相似文献   
56.
57.
This paper is concerned with the products of a number of Neolithic quarries in highland Britain. It investigates the claim that the scale of axe distribution was partly the result of social factors which resulted in these artefacts gaining an added value in areas remote from their sources. One case study considers the sequence of production in Cumbria, in relation to the tensile strength of the rock quarried in different parts of the region. It shows that these considerations had only a limited influence over the choice of stone source and the scale on which it was worked. A second study compares the tensile strength of the main raw materials used for making non-flint axes with the extent to which these sources were actually exploited. Again there is only a limited relationship between the two, suggesting that social factors may indeed have been important.  相似文献   
58.
Global social, political, and economic change during the past quarter-century has been profound, particularly in major areas with languages different from those usually employed by Canadian geographers. Surveys by the author suggest that senior Canadian geography graduate students, however, are inadequately prepared to assimilate primary world sources of information, including the relevant research literatures (except those published in this country's two official languages), and that few geography departments any longer require competence in more than one language at any level of study. Nevertheless, geographers and their students could benefit in many ways from foreign language expertise. Suggestions are made whereby geography departments could reinforce their existing rigorous training programs with foreign linguistic and area competence.  相似文献   
59.
60.
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