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   7621篇
  免费   397篇
  2023年   42篇
  2020年   130篇
  2019年   190篇
  2018年   252篇
  2017年   229篇
  2016年   285篇
  2015年   190篇
  2014年   180篇
  2013年   2042篇
  2012年   229篇
  2011年   261篇
  2010年   245篇
  2009年   237篇
  2008年   201篇
  2007年   219篇
  2006年   180篇
  2005年   116篇
  2004年   104篇
  2003年   111篇
  2002年   119篇
  2001年   146篇
  2000年   110篇
  1999年   115篇
  1998年   92篇
  1997年   86篇
  1996年   91篇
  1995年   73篇
  1994年   61篇
  1993年   73篇
  1992年   75篇
  1991年   60篇
  1990年   64篇
  1989年   58篇
  1988年   52篇
  1987年   62篇
  1986年   62篇
  1985年   70篇
  1984年   80篇
  1983年   86篇
  1982年   69篇
  1981年   67篇
  1980年   67篇
  1979年   63篇
  1978年   69篇
  1977年   68篇
  1976年   61篇
  1975年   71篇
  1974年   44篇
  1972年   41篇
  1971年   38篇
排序方式: 共有8018条查询结果,搜索用时 15 毫秒
41.
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   
42.
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   
43.
44.
45.
46.
47.
ABSTRACT. The premise of this paper is that one can discover much about the location determinants of high-technology industry by examining the location (migration) decision of workers with high-technology occupations. A model of the high-technology worker migration decision is developed that permits estimation of worker response to both personal and area characteristics, the latter chosen to mirror location factors often cited by high-technology firms as important for both the attraction and retention of their specialized work force. Logit estimates of this model between 1975 and 1980 are presented. The paper is concluded with a discussion of policy implications.  相似文献   
48.
49.
50.
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