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   15705篇
  免费   511篇
  国内免费   13篇
财政金融   2638篇
工业经济   1108篇
计划管理   2751篇
经济学   3618篇
综合类   325篇
运输经济   146篇
旅游经济   336篇
贸易经济   2925篇
农业经济   795篇
经济概况   1563篇
邮电经济   24篇
  2022年   90篇
  2021年   129篇
  2020年   231篇
  2019年   324篇
  2018年   464篇
  2017年   521篇
  2016年   457篇
  2015年   285篇
  2014年   441篇
  2013年   1724篇
  2012年   463篇
  2011年   448篇
  2010年   464篇
  2009年   468篇
  2008年   506篇
  2007年   461篇
  2006年   373篇
  2005年   373篇
  2004年   319篇
  2003年   329篇
  2002年   301篇
  2001年   295篇
  2000年   292篇
  1999年   256篇
  1998年   270篇
  1997年   271篇
  1996年   266篇
  1995年   249篇
  1994年   233篇
  1993年   253篇
  1992年   238篇
  1991年   232篇
  1990年   212篇
  1989年   187篇
  1988年   145篇
  1987年   177篇
  1986年   175篇
  1985年   262篇
  1984年   273篇
  1983年   265篇
  1982年   235篇
  1981年   235篇
  1980年   202篇
  1979年   210篇
  1978年   154篇
  1977年   159篇
  1976年   137篇
  1975年   109篇
  1974年   103篇
  1973年   95篇
排序方式: 共有10000条查询结果,搜索用时 656 毫秒
41.
Analysis of firm investment behavior during 1982–1993 shows that the Tax Reform Act of 1986 (TRA 86) Public Law No. 99-514 substantially affects both purchases and leases of depreciable assets. The changes in the regular corporate income tax rules are shown to lower asset acquisition. The effect of the alternative minimum tax (AMT) is found to vary with the debt share in firms’ capital structure and with the frequency of AMT exposure during the life of the assets acquired. On average, TRA86 depresses asset purchases less for firms that are subject to the AMT: AMT somewhat mitigates the negative effects of the regular tax rules.  相似文献   
42.
43.
44.
45.
46.
47.
48.
This report looks at evaluation studies of a number of cooperative academic-industrfy research programmes in Europe, and suggests that indirect economic benefits should be taken into account as well as motives and goals of participating firms.  相似文献   
49.
Medic (Medicago spp.) pastures are widely grown in rotation with dryland cereal crops in Mediterranean climate zones of Australia. Attempts since the 1960's to introduce this system to Mediterranean west Asia and north Africa (the native region of medic) have not lead to significant adoption; farmers in the region recognize medic, but as a weed and natural pasture plant. This first detailed economic evaluation of the rotational medic system was conducted using a whole-farm linear programming model based on the agricultural system of north-west Syria. The model represents in detail impacts of rotation on yields, labor requirements of alternative farm activities, availability of family and hired labor, subsistence income requirements, livestock feed sources and uses at different times and a choice of sheep stocking rates. Biological data for the analysis are based on a large six-year cropping and grazing experiment near Aleppo on terra-rossa soil with rainfall mainly in winter and averaging about 330 mm annually. The trial compared a dryland medic-wheat system and traditional two-year rotations of wheat with: fallow, watermelon, lentil and vetch. Results indicate that, given current prices and yields from the trial, medic is less profitable than traditional rotations. The model was used to investigate situations in which medic would be economically preferred. Selection of a medic rotation by the model was found to be particularly sensitive to the area of the farm and the price of labor. On small farms, labor availability per hectare is high, favouring the production of labor intensive crops such as lentil and watermelon. On larger farms, labor costs of these enterprises are substantial, increasing the relative profitability of medic, especially if labor prices increase. Interestingly, the relative desirability of medic is more sensitive to its impact on subsequent wheat crops than to the level of pasture production. We also found that modest increases in the prices of sheep products (especially milk) have a major impact on the economic performance of medic. These insights will allow improved focusing and targeting of future research and extension activities.  相似文献   
50.
This paper explores the relationship between organizational context and the interpretation of strategic issues by examining the hypothesis that CEOs' interpretations of foreign investment in the USA are influenced by the organizational context in which they are embedded. Three aspects of organizational context - the global business experience of the firm; the firm's level of organizational inertia (as represented by firm age and size); and the resources available for responding - are examined as predictors of CEOs' perceptions of foreign investment as a threat or an opportunity. Analysis of data from 320 organizations, controlled by industry, shows that global business experience, firm size, and perceived capability are significant predictors of the perception of threat and opportunity. the discussion addresses the implications of these findings for future research on issue interpretation and organizational context.  相似文献   
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