全文获取类型
收费全文 | 87431篇 |
免费 | 3336篇 |
国内免费 | 1673篇 |
专业分类
财政金融 | 4332篇 |
工业经济 | 3333篇 |
计划管理 | 19494篇 |
经济学 | 11698篇 |
综合类 | 11363篇 |
运输经济 | 711篇 |
旅游经济 | 1362篇 |
贸易经济 | 7953篇 |
农业经济 | 6516篇 |
经济概况 | 9666篇 |
水利工程 | 16012篇 |
出版年
2024年 | 228篇 |
2023年 | 947篇 |
2022年 | 1539篇 |
2021年 | 2314篇 |
2020年 | 2405篇 |
2019年 | 1593篇 |
2018年 | 1492篇 |
2017年 | 1797篇 |
2016年 | 2162篇 |
2015年 | 2691篇 |
2014年 | 6250篇 |
2013年 | 6253篇 |
2012年 | 7526篇 |
2011年 | 9472篇 |
2010年 | 7196篇 |
2009年 | 5732篇 |
2008年 | 5768篇 |
2007年 | 5314篇 |
2006年 | 4989篇 |
2005年 | 3846篇 |
2004年 | 2842篇 |
2003年 | 2363篇 |
2002年 | 1775篇 |
2001年 | 1682篇 |
2000年 | 1197篇 |
1999年 | 769篇 |
1998年 | 426篇 |
1997年 | 378篇 |
1996年 | 304篇 |
1995年 | 242篇 |
1994年 | 182篇 |
1993年 | 174篇 |
1992年 | 116篇 |
1991年 | 56篇 |
1990年 | 33篇 |
1989年 | 55篇 |
1988年 | 32篇 |
1987年 | 9篇 |
1986年 | 5篇 |
1985年 | 48篇 |
1984年 | 76篇 |
1983年 | 52篇 |
1982年 | 51篇 |
1981年 | 17篇 |
1980年 | 19篇 |
1979年 | 12篇 |
1978年 | 4篇 |
1977年 | 6篇 |
1973年 | 1篇 |
排序方式: 共有10000条查询结果,搜索用时 203 毫秒
81.
建筑工程资格预审无论对业主还是对承包商都至关重要,根据建筑工程的特点,在目前普遍采用的资格预审评价方法的基础之上,总结了进行资格预审的评价指标体系,并提出了基于模糊数学意见集中排序法的建筑工程资格预审方法。 相似文献
82.
通过广西水电南宁地质勘探基础工程处推行职工持股的思路,结合广西水利施工企业目前的具体情况, 就如何推行职工持股进行探讨,并提出建议及看法。 相似文献
83.
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
84.
Karin M. Ekstrm Marianne P. Ekstrm Marina Potapova Helena Shanahan 《International Journal of Consumer Studies》2003,27(4):294-301
The purpose of this article is to describe how households in Novgorod the Great, Russia, deal with food provision in everyday life. The study focuses on changes experienced in food provision and consumption in Russian society, in order to illustrate how households respond to the transformation towards a market economy. The study reflects women's perspective on food provision. Students from Novgorod the Great visited 105 households and asked the women in the household to answer a questionnaire. Results from the study show that in order to cope with changes in society related to economic reforms, Russian households had changed both their food consumption and food production patterns. There was no big difference between urban and rural households. Nearly all of the households were self‐sufficient in the provision of vegetables and potatoes. Many households had a ‘dacha’ (plot), where they produced most of what they needed. Among the changes experienced during recent years (i.e. during the end of the 1990s), a decade after perestroika was initiated, households mentioned the rise in food prices and the decrease of income. Households reported that they consumed less fruit and/or meat. Some households also mentioned that the quality of nourishment had decreased, thereby indicating lower general quality, lower nutrition value, or less healthy foodstuffs. 相似文献
85.
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
86.
87.
88.
立足政府需要,从侧面对当前政府职能转变过程进行分析和探讨,希望以政府本身作为理性实体的运作为基础,对该问题进行解释。 相似文献
89.
Debra Zahay Author Vitae Abbie Griffin Author Vitae Elisa Fredericks Author Vitae 《Industrial Marketing Management》2004,33(7):657-666
This paper presents qualitative and exploratory research investigating the role that managing knowledge and information plays in new product development (NPD). A set of 20 in-depth interviews uncovered eight basic types of information used throughout the NPD process and three general approaches to managing information needed in the NPD process. Although some exemplary companies seem to do an outstanding job of collecting and disseminating information, the majority of firms struggle. NPD process automation solutions tackle part of the problem, ignoring nonquantitative data forms and the full picture of information use throughout the entire development process. 相似文献
90.
土石过水围堰过水期最不利工况及其流量确定 总被引:7,自引:0,他引:7
本文系统分析了影响土石过水围堰溢流工况的主要因素,提出衡量最不利工况的指标和确定员不利流量的方法,为土石过水围堰堰体下游护坡结构及消能防冲设施设计提供了理论依据。通过理论计算结果与模型试验现场观测资料数据对比分析,说明提出的过水期最不利流量判别方法是符合实际情况的。 相似文献