全文获取类型
收费全文 | 38196篇 |
免费 | 516篇 |
国内免费 | 69篇 |
专业分类
财政金融 | 5514篇 |
工业经济 | 2081篇 |
计划管理 | 6804篇 |
经济学 | 8016篇 |
综合类 | 2654篇 |
运输经济 | 220篇 |
旅游经济 | 209篇 |
贸易经济 | 6807篇 |
农业经济 | 1229篇 |
经济概况 | 4567篇 |
信息产业经济 | 45篇 |
邮电经济 | 635篇 |
出版年
2024年 | 36篇 |
2023年 | 201篇 |
2022年 | 385篇 |
2021年 | 606篇 |
2020年 | 590篇 |
2019年 | 371篇 |
2018年 | 2616篇 |
2017年 | 2591篇 |
2016年 | 1637篇 |
2015年 | 663篇 |
2014年 | 883篇 |
2013年 | 1393篇 |
2012年 | 2050篇 |
2011年 | 4247篇 |
2010年 | 3909篇 |
2009年 | 2999篇 |
2008年 | 3083篇 |
2007年 | 3262篇 |
2006年 | 1804篇 |
2005年 | 1768篇 |
2004年 | 896篇 |
2003年 | 970篇 |
2002年 | 633篇 |
2001年 | 381篇 |
2000年 | 208篇 |
1999年 | 128篇 |
1998年 | 89篇 |
1997年 | 54篇 |
1996年 | 48篇 |
1995年 | 23篇 |
1994年 | 34篇 |
1993年 | 33篇 |
1992年 | 30篇 |
1991年 | 22篇 |
1990年 | 12篇 |
1989年 | 16篇 |
1988年 | 9篇 |
1987年 | 9篇 |
1986年 | 17篇 |
1985年 | 10篇 |
1984年 | 22篇 |
1983年 | 4篇 |
1982年 | 8篇 |
1981年 | 6篇 |
1980年 | 2篇 |
1979年 | 6篇 |
1978年 | 6篇 |
1976年 | 3篇 |
1975年 | 3篇 |
1966年 | 1篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
1.
2.
随着3G时代的到来,电信企业之间的竞争将更加激烈.电信企业要想在激烈的竞争环境中立足,拥有自己的市场,必须以服务营销为战略研究重点,建立以用户为中心的服务营销体制,建立包括企业利润、企业的成长性,用户忠诚、用户满意、提供给用户的产品与服务的价值,员工能力、满意、忠诚及效率在内的电信服务利润链. 相似文献
3.
The paper argues that although considerations such as industry consolidation, the role of lending and the effects of technology are still important in shaping the future of investment banking, sustainable competitive advantage necessitates that emphasis is also placed on thought leadership. This entails quite a radical change in terms of the way in which the industry approaches the problem of competition and requires emphasis on value creation for all the constituent parts of the industry: corporations, investors, the banks themselves and research departments. Accordingly, the paper provides a rationale for this change and provides inter alia a range of examples to illustrate how thought leadership could lead to a fundamental change in the future of the investment banking industry. 相似文献
4.
A play-the-winner-type urn design with reduced variability 总被引:1,自引:0,他引:1
Anastasia Ivanova 《Metrika》2003,58(1):1-13
We propose a new adaptive allocation rule, the drop-the-loser, that randomizes subjects in the course of a trial comparing
treatments with dichotomous outcomes. The rule tends to assign more patients to better treatments with the same limiting proportion
as the randomized play-the-winner rule. The new design has significantly less variable allocation proportion than the randomized
play-the-winner rule. Decrease in variability translates into a gain in statistical power. For some values of success probabilities
the drop-the-loser rule has a double advantage over conventional equal allocation in that it has better power and assigns
more subjects to the better treatment.
Acknowledgments. I thank Stephen Durham, the associate editor, and the referees for their helpful suggestions. 相似文献
5.
6.
7.
8.
9.
10.
Eric F. Parkinson 《International Journal of Technology and Design Education》2004,14(3):219-243
Construction kits have played a significant part in nurturing the growth and development of the minds and manipulation-based
skills of children (and adults) in formal and non-formal education settings. These kits have origins rooted in the representation
of the built world and now have a diversity of form and function, including technical versions with moving parts. This article
examines some of the historically based ideas that lie behind the role that kits may have in terms of physical modelling.
The article traces the transformation of kits from simple bricks and blocks into more complicated pieces for space-filling
and achieving the transfer of forces and motion. This transformation occurred during the Victorian era when the influence
of the ideas of educationalists and, perhaps rather strangely, exponents of early aviation, played major roles in determining
the diversity of forms of construction kit and modelled possibilities that are now to be seen in classrooms and homes. The
article ends with a review of some of the lessons from the past and present that will need to be considered in relation to
concrete modelling in schools for the future.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献