全文获取类型
收费全文 | 35638篇 |
免费 | 760篇 |
专业分类
财政金融 | 6251篇 |
工业经济 | 2008篇 |
计划管理 | 5785篇 |
经济学 | 8443篇 |
综合类 | 627篇 |
运输经济 | 220篇 |
旅游经济 | 338篇 |
贸易经济 | 7812篇 |
农业经济 | 815篇 |
经济概况 | 3470篇 |
信息产业经济 | 46篇 |
邮电经济 | 583篇 |
出版年
2023年 | 178篇 |
2022年 | 132篇 |
2021年 | 203篇 |
2020年 | 393篇 |
2019年 | 497篇 |
2018年 | 2875篇 |
2017年 | 2709篇 |
2016年 | 1836篇 |
2015年 | 504篇 |
2014年 | 698篇 |
2013年 | 2724篇 |
2012年 | 1111篇 |
2011年 | 2551篇 |
2010年 | 2416篇 |
2009年 | 2110篇 |
2008年 | 2009篇 |
2007年 | 2248篇 |
2006年 | 534篇 |
2005年 | 776篇 |
2004年 | 796篇 |
2003年 | 897篇 |
2002年 | 592篇 |
2001年 | 395篇 |
2000年 | 381篇 |
1999年 | 323篇 |
1998年 | 369篇 |
1997年 | 295篇 |
1996年 | 259篇 |
1995年 | 239篇 |
1994年 | 257篇 |
1993年 | 259篇 |
1992年 | 282篇 |
1991年 | 270篇 |
1990年 | 212篇 |
1989年 | 198篇 |
1988年 | 173篇 |
1987年 | 171篇 |
1986年 | 186篇 |
1985年 | 260篇 |
1984年 | 273篇 |
1983年 | 259篇 |
1982年 | 230篇 |
1981年 | 204篇 |
1980年 | 180篇 |
1979年 | 172篇 |
1978年 | 165篇 |
1977年 | 137篇 |
1976年 | 130篇 |
1975年 | 143篇 |
1974年 | 109篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
Germano Mwabu Mwangi S. Kimenyi Paul K. Kimalu Nancy Nafula Damiano Kulundu Manda 《Revue africaine de developpement》2003,15(1):77-85
Household surveys provide data that is used for identifying and measuring the poverty status of households and individuals. However, carrying out such surveys is expensive, especially in poor developing countries. Thus it is important to make maximum use of the available survey data in developing countries, especially in sub‐Saharan Africa, where such data are expensive to collect and analyse. This paper develops a simple method for using poverty indices derived from survey data for a given year, to predict poverty rates for subsequent periods without having to conduct a new household survey. We illustrate the workings of the method with data from Kenyan household surveys for 1994 and 1997. 相似文献
72.
73.
Previous work shows that establishments with higher proportions of women are more likely to use piece rates but that individual women are less likely to receive performance pay. We present a model in which lower expected tenure and labor force attachment are positively associated with piece rates but are negatively associated with other forms of performance pay. Analysis of the National Longitudinal Survey of Youth (NLSY) confirms that women are more likely to be paid piece rates and simultaneously less likely to be paid commissions and bonuses. 相似文献
74.
75.
76.
77.
78.
The performance of service industries in Canada has been lower than that of good industries over the last four decades, with noticeable exceptions such as for railways and telecommunication carriers. Service industries were less economically (and technically) efficient in that they generated less output value (quantity) per hour worked (level and growth) or per combined unit of labour and capital (multifactor productivity growth) than good industries. The relative output price of services declined slightly over time compared with goods. At the disaggregated level, changing relative output prices were substantial and proved to be an important factor explaining the relative satisfactory economic performance of many service industries despite their low technical performance. Nevertheless, the output share of service industries increased over that period, sustained, mainly, by the growing recourse of all firms to outsourcing of services. 相似文献
79.
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
80.