全文获取类型
| 收费全文 | 6316篇 |
| 免费 | 488篇 |
| 国内免费 | 16篇 |
专业分类
| 财政金融 | 144篇 |
| 工业经济 | 417篇 |
| 计划管理 | 1125篇 |
| 经济学 | 1017篇 |
| 综合类 | 512篇 |
| 运输经济 | 30篇 |
| 旅游经济 | 43篇 |
| 贸易经济 | 596篇 |
| 农业经济 | 2363篇 |
| 经济概况 | 573篇 |
出版年
| 2025年 | 30篇 |
| 2024年 | 85篇 |
| 2023年 | 97篇 |
| 2022年 | 94篇 |
| 2021年 | 180篇 |
| 2020年 | 234篇 |
| 2019年 | 175篇 |
| 2018年 | 123篇 |
| 2017年 | 157篇 |
| 2016年 | 170篇 |
| 2015年 | 185篇 |
| 2014年 | 395篇 |
| 2013年 | 421篇 |
| 2012年 | 519篇 |
| 2011年 | 583篇 |
| 2010年 | 480篇 |
| 2009年 | 420篇 |
| 2008年 | 474篇 |
| 2007年 | 425篇 |
| 2006年 | 399篇 |
| 2005年 | 245篇 |
| 2004年 | 181篇 |
| 2003年 | 143篇 |
| 2002年 | 127篇 |
| 2001年 | 135篇 |
| 2000年 | 124篇 |
| 1999年 | 54篇 |
| 1998年 | 36篇 |
| 1997年 | 26篇 |
| 1996年 | 21篇 |
| 1995年 | 12篇 |
| 1994年 | 15篇 |
| 1993年 | 13篇 |
| 1992年 | 11篇 |
| 1991年 | 5篇 |
| 1990年 | 1篇 |
| 1989年 | 1篇 |
| 1988年 | 1篇 |
| 1987年 | 3篇 |
| 1986年 | 2篇 |
| 1985年 | 7篇 |
| 1984年 | 6篇 |
| 1983年 | 1篇 |
| 1982年 | 2篇 |
| 1981年 | 1篇 |
| 1980年 | 1篇 |
排序方式： 共有6820条查询结果，搜索用时 15 毫秒
201.
生态经济协调发展是林业或经济社会可持续发展的核心问题。本文从理论上阐述了这种发展的可能性 ,从我国林业发展的现实说明了其现实性 ,并对当前如何落实这一发展 ,提出了加强森林经营的基本要求。 相似文献
202.
203.
COVID-19 has caused major disruptions to agricultural supply chains around the world. Researchers and policy-makers are interested in identifying means to reduce the disruptive effects caused by the pandemic. We investigate the impacts of COVID-19 on the operation of e-commerce stores (in short, e-stores) specialising in agricultural inputs. The difference-in-differences method (DID) is employed to estimate the causal relationship between COVID-19 and online sales of agricultural inputs using data from 54,244 agricultural input e-stores registered in 118 prefecture-level cities across 15 provinces and hosted on two major Chinese e-commerce platforms. The results show that COVID-19 led to a substantial growth in monthly sales of agricultural input e-stores, and this growth of online sales varied across store scales and by types of agricultural inputs. In particular, e-stores selling seeds and seedlings experienced a larger growth in sales than stores selling agricultural machinery and implements, and the mid- and larger-scaled e-stores experienced more growth of sales than micro- and small-scaled e-stores. Further analysis reveals that the growth of online sales of agricultural inputs was driven mainly by an increase in the quantity of customer orders (QCO). The findings of this paper underscore the importance of e-commerce in ensuring the resilience of the agricultural supply chain during the pandemic period. 相似文献
204.
This paper discusses the role of collaborations in the development and implementation of sustainable livestock farming. The study reflects upon the experiences with two innovative pig farming concepts in the Netherlands that aim to address sustainability-related concerns regarding the economic viability, environmental impact and social responsibility of livestock production. The findings show that collaborations can result in smarter and innovative solutions and provide support in the development of more sustainable farming concepts. The study also shows that collaborations do not safeguard the implementing of these concepts in practice. Pioneers are confronted with higher production costs and the complex context of agricultural policies and regulations. These pioneering efforts are, however, the seeds for change, and the key ingredient for a transition towards more sustainable production. We rely upon their innovations, social networks and learning experiences in the transition towards more sustainable production. Therefore, pioneers need to be protected from market influences and regulatory barriers, and supported by intermediaries when developing novelties for a more sustainable agriculture. The findings emphasize the need for more knowledge exchange and understanding between farmers, policy-makers and researchers to navigate towards a more sustainable agriculture in the future. 相似文献
205.
206.
207.
208.
Nowadays, industrial firms are very much careful to build a green environment by reducing carbon emissions. The government imposes some rules and regulations to provide a better eco-friendly environment. In this study, the cap-and-trade mechanism has been considered in a production model to control the carbon emissions rate. The manufacturers invest in advanced green technology to reduce per unit emissions. As online and offline selling is crucial to any industry for increasing customer demand, the manufacturers sell their products by dual-channel and advertise their products by online channel to make more popular of their products. Keeping these in mind, a sustainable flexible production model with single-type substitutable product production is considered here by imposing a cap-and-tax policy, investing in green technology, and advertising for products. This model is divided into two cases: with and without investment in green technology. The demand of each manufacturer depends upon an online selling price, an offline selling price, and an online advertisement of the product. A classical optimization technique helps to get the optimum strategies for the online selling price, offline selling price, advertisement investment, green technology, cycle time, and production rate. From the numerical study, it is proved that the industry gets 6.97% more profit in the case of green technology investment and the proposed study gives 5.74% more profit than the traditional production system. Sensitivity analysis and managerial insights are performed. 相似文献
209.
210.
本文介绍了乙二醛的生产方法，分析了国内外乙二醛的生产现状和市场情况，提出了我国乙二醛行业今后的发展建议。 相似文献