全文获取类型
收费全文 | 22087篇 |
免费 | 126篇 |
国内免费 | 1篇 |
专业分类
财政金融 | 3830篇 |
工业经济 | 1219篇 |
计划管理 | 3476篇 |
经济学 | 4865篇 |
综合类 | 551篇 |
运输经济 | 53篇 |
旅游经济 | 85篇 |
贸易经济 | 5407篇 |
农业经济 | 304篇 |
经济概况 | 1806篇 |
信息产业经济 | 44篇 |
邮电经济 | 574篇 |
出版年
2021年 | 29篇 |
2020年 | 69篇 |
2019年 | 88篇 |
2018年 | 2375篇 |
2017年 | 2131篇 |
2016年 | 1304篇 |
2015年 | 157篇 |
2014年 | 194篇 |
2013年 | 700篇 |
2012年 | 592篇 |
2011年 | 2100篇 |
2010年 | 1957篇 |
2009年 | 1681篇 |
2008年 | 1669篇 |
2007年 | 2008篇 |
2006年 | 231篇 |
2005年 | 517篇 |
2004年 | 589篇 |
2003年 | 689篇 |
2002年 | 419篇 |
2001年 | 195篇 |
2000年 | 166篇 |
1999年 | 136篇 |
1998年 | 122篇 |
1997年 | 107篇 |
1996年 | 113篇 |
1995年 | 97篇 |
1994年 | 81篇 |
1993年 | 86篇 |
1992年 | 79篇 |
1991年 | 69篇 |
1990年 | 69篇 |
1989年 | 66篇 |
1988年 | 67篇 |
1987年 | 63篇 |
1986年 | 88篇 |
1985年 | 98篇 |
1984年 | 91篇 |
1983年 | 89篇 |
1982年 | 74篇 |
1981年 | 78篇 |
1980年 | 80篇 |
1979年 | 60篇 |
1978年 | 72篇 |
1977年 | 83篇 |
1976年 | 45篇 |
1975年 | 48篇 |
1974年 | 55篇 |
1973年 | 38篇 |
1972年 | 30篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
11.
12.
13.
14.
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
15.
16.
Calvyn Potgieter 《International Journal of Technology and Design Education》2004,14(3):205-218
In this article the impact of technology education, as a new learning area (subject) in the curriculum, on in-service teacher
education in South Africa is described in order to ascertain the extent of the impact. The research on which this article
is based draws on a variety of experiences and observations in the field at grassroots level (in particular an outreach project
in rural communities). The envisaged impact of technology education on South African schools, communities, teacher educators
and teachers, the range of in-service teacher education that is required, and the impacts in urban and rural areas are discussed.
Finally a number of concluding remarks are made about the extent of the impact of the inclusion of technology education in
the new National Curriculum Statement and whether the situation has changed since the implementation of a pilot technology
education project in 1998.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
17.
Richard D. Horan Jason F. Shogren Erwin Bulte 《Scottish journal of political economy》2003,50(2):131-148
One Pleistocene mystery is why early North Americans eradicated their large, potentially domesticable animals (e.g., horses), whereas early Europeans did not. A commonly‐held hypothesis is that European species were evasive due to co‐evolution with hominids, whereas North American animals were naïve and unable to adapt quickly enough when experienced human hunters arrived from Eurasia. We explore this hypothesis with a paleoeconomic model of co‐evolution that integrates human hunting investments and wildlife population responses. We find that investments in hunting ability, based on the relative scarcity of prey species, could have mattered more than wildlife ‘naivety’ in explaining the extinction. 相似文献
18.
19.
Experiments are used to examine the effects of social comparisons in ultimatum bargaining. We inform responders about the average offer before they decide whether to accept or reject their specific offer. This significantly increases offers and offer‐specific rejection probabilities. For comparison, we consider another change in informational conditions: telling responders the total pie is $30—ex ante it was either $15 or $30—affects offers and rejection probabilities roughly as much. Our results are consistent with people’s dislike for deviations from the norm of equity but inconsistent with fairness theories, where people dislike income disparity between themselves and their referents. 相似文献
20.