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   9084篇
  免费   195篇
财政金融   1661篇
工业经济   729篇
计划管理   1467篇
经济学   2048篇
综合类   125篇
运输经济   52篇
旅游经济   123篇
贸易经济   1499篇
农业经济   507篇
经济概况   1063篇
信息产业经济   1篇
邮电经济   4篇
  2021年   62篇
  2020年   115篇
  2019年   159篇
  2018年   213篇
  2017年   214篇
  2016年   218篇
  2015年   111篇
  2014年   217篇
  2013年   906篇
  2012年   281篇
  2011年   346篇
  2010年   270篇
  2009年   305篇
  2008年   262篇
  2007年   246篇
  2006年   209篇
  2005年   217篇
  2004年   186篇
  2003年   178篇
  2002年   167篇
  2001年   186篇
  2000年   192篇
  1999年   167篇
  1998年   158篇
  1997年   146篇
  1996年   147篇
  1995年   130篇
  1994年   123篇
  1993年   143篇
  1992年   157篇
  1991年   131篇
  1990年   136篇
  1989年   123篇
  1988年   138篇
  1987年   112篇
  1986年   125篇
  1985年   147篇
  1984年   144篇
  1983年   143篇
  1982年   137篇
  1981年   135篇
  1980年   133篇
  1979年   109篇
  1978年   126篇
  1977年   88篇
  1976年   90篇
  1975年   78篇
  1974年   66篇
  1973年   75篇
  1972年   58篇
排序方式: 共有9279条查询结果,搜索用时 0 毫秒
21.
The personal computer (PC) marketplace in the US presents a dizzying array of component suppliers and products. No single firm dominates the industry with a complete package of hardware and software components. Although one company's operating systems and general-purpose applications are installed on most PCs in the US, the other system components—processors, memory, storage devices, display adapters, monitors, specialized applications, and so on—come from any number of sources. David T. Methe, Ryoko Toyama, and Junichiro Miyabe point out that the PC industry in Japan also exhibits this decentralized nature. However, they also note that despite the decentralized network structure of the Japanese PC industry, one company—NEC—was able to achieve a dominant market share. To provide insight into the key issues involved in the management of complex technology, they contrast NEC's strategic approach to product development and organizational learning with the approaches taken by Fujitsu—the firm that placed a distant second in this market. Despite matching NEC in terms of technological capabilities, financial resources, and managerial talent, Fujitsu never managed to threaten NEC's dominance of the PC market in Japan. Fujitsu continually emphasized technological leadership, even at the expense of protecting its installed base. Poor coordination of resources and product development efforts resulted in incompatibilities among Fujitsu's various products, and the company failed to foster close relationships with suppliers of such key technologies as software and peripherals. NEC's PCs did not enjoy the advantages of first-to-market status or technological leadership. Instead, NEC achieved market dominance by finding the combination of product technologies that met the needs of the greatest number of consumers. Throughout almost 20 years of competition in the PC industry, NEC successfully maintained consistency and backward compatibility across its product lines. NEC also recognized the importance of third-party software developers, and carefully cultivated relations with these firms as a source of competitive advantage. In other words, NEC struck the right balance between three key factors: technological innovation, motivation of third-party developers of software and peripherals, and service to its installed base of customers.  相似文献   
22.
Previous studies of the driving times of shopping center patrons have not examined the effect of limited access highways. This study analyzed the impact of interstate highways on the driving times of 204 shoppers at three medium-sized regional shopping centers. Those shoppers indicating usage of interstate highways to reach their shopping destinations were significantly more likely to incur travel times greater than fifteen and twenty minutes than those not using the available interstate roads. In predicting the drawing power of these shopping centers, factors besides mass were found to be useful. These include square footage of shopping goods, stores, and number of parking places.  相似文献   
23.
Unemployment has been identified as one of the main problems confronting South Africa. Recently, in order to improve rural infrastructure and create employment, several pilot projects of rural road construction have been initiated in South Africa. In such a context it is considered that attention should be drawn to a pilot project carried out some time ago in Botswana to examine the potential of labour‐intensive methods in the construction and maintenance of rural roads.

The main conclusion of the pilot project was that labour‐intensive methods were viable, although attention had to be paid to several critical factors. In 1982, following its evaluation of the pilot project, the Government of Botswana decided that over the next five years the technical and organisational methods developed during the pilot project should be replicated throughout Botswana.

After a brief survey of the background to the project, the paper summarises several important features of the pilot project and its main findings. The paper closes with some comments on the implications of this pilot project for those currently underway in South Africa.  相似文献   

24.
Pacific Presbyterian Medical Center has chalked up an impressive string of successes. What's ahead? A $20 million cancer center.  相似文献   
25.
26.
Abstract.  While it is well known that demand elasticities calculated at the macro level will in general differ from those calculated at the micro level because of aggregation effects, there remain the questions of how large the effects are and how they vary with the degree of inequality in the income distribution. We explore these questions with models based on a quadratic version of the Almost Ideal Demand System. We investigate the elasticity differences theoretically and then calibrate the models and generate numerical results, using income data for seven countries with widely different distributions. The aggregation effects are found generally to be rather small, even with highly unequal income distributions.  相似文献   
27.
The authors examine recent migration patterns into and within the European Union. Issues involving asylum and migration policy are discussed, and problems caused by differing naturalization practices in different countries are considered. Skill patterns of migrants and problems in labor markets are also investigated.  相似文献   
28.
29.
30.
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