首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   44745篇
  免费   1551篇
  国内免费   538篇
财政金融   3596篇
工业经济   2124篇
计划管理   10941篇
经济学   7391篇
综合类   6908篇
运输经济   449篇
旅游经济   818篇
贸易经济   5426篇
农业经济   3491篇
经济概况   5690篇
  2024年   72篇
  2023年   533篇
  2022年   736篇
  2021年   1263篇
  2020年   1539篇
  2019年   920篇
  2018年   791篇
  2017年   935篇
  2016年   1081篇
  2015年   1254篇
  2014年   3300篇
  2013年   3836篇
  2012年   3885篇
  2011年   4823篇
  2010年   3534篇
  2009年   2933篇
  2008年   2947篇
  2007年   2457篇
  2006年   2351篇
  2005年   1761篇
  2004年   1245篇
  2003年   1084篇
  2002年   781篇
  2001年   777篇
  2000年   541篇
  1999年   323篇
  1998年   175篇
  1997年   152篇
  1996年   123篇
  1995年   95篇
  1994年   72篇
  1993年   68篇
  1992年   63篇
  1991年   51篇
  1990年   29篇
  1989年   21篇
  1988年   26篇
  1987年   9篇
  1986年   4篇
  1985年   51篇
  1984年   64篇
  1983年   46篇
  1982年   36篇
  1981年   13篇
  1980年   14篇
  1979年   11篇
  1978年   2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 109 毫秒
991.
制度互补与电力市场化改革   总被引:2,自引:0,他引:2  
我国电力改革选择了从发电环节的改革开始,经重组国家电力公司、实行厂网分离,到实行电价改革的渐进式策略。这一策略虽然因其速度缓慢、终端用户无法分享改革利益而备受批评,但它使社会付出了较低的“无序成本”。随着供求关系的缓解.电力产业应强化制度互补作用,尽快改变改革在发电、输电、配电、售电各个环节之间进展不平衡的状况,着力实现配电和售电分离。在售电环节引入竞争机制.探索与市场化改革相适应的监管体制和交易方式,解决电源结构不合理、电力发电输电配电效率低、负外部性等深层次问题,最终建立有效监管的电力市场.使市场在电力资源的配置上发挥更大作用。  相似文献   
992.
产业竞争优势模型:基于黑龙江省绿色食品产业的实证研究   总被引:12,自引:0,他引:12  
自1990年以来我国绿色食品产业呈持续快速发展态势,对农产品出口发挥了重要作用.但产业市场集中度低、企业规模小、驰名品牌少和品牌杂乱等问题制约着产业和企业进一步发展,归结为一点就是产业竞争优势不明显.本文应用钻石体系理论,建立竞争优势评价模型,并以黑龙江省为例分析和检验,得出竞争优势指数和影响因素权重,并提出对有竞争优势的要素进行优化和对有比较劣势的要素进行改进,以达到提高产业竞争优势的目的.  相似文献   
993.
The paper introduces a financial statement method to assess the future potential of a firm. First, the last strategic steady phase is identified. Second, growth rate for total expenditure is estimated (growth process). Third, the revenue generating potential of total expenditure is evaluated by a distributed lag function (revenue-generating process). This function is used to recalculate expenses and assets using alternative depreciation theories. Third, financial behavior is modeled by analyzing financial assets, taxation, interest expenses and revenues, and dividends (financial process). Fourth, these processes are used to assess the future potential. The method is illustrated by the case of Nokia for the period 1990-2000.  相似文献   
994.
通过购电成本结构分析,指出了当前发电计划编制及执行中存在的问题和当前发电计划编制对电网购电费的影响。重点研究了有关降低电网购电成本的方法及实证,并为政府价格相关部门提出创建节能型社会的政策建议。  相似文献   
995.
通过到基层电力企业厂、局考察了解,目前电力事业呈现稳步快速发展趋势,但电力建设面临的法制环境还不尽人意。如执法体制不顺,执法难以到位,部门各自为政,支持配合不够:阻工现象严重,延误建设工期;冲击电力企业,扰乱工作秩序;设施破坏严重,危及电力安全,经济损失巨大等等,为此提出了一些改善环境的意见和建议。  相似文献   
996.
王旻  王雯 《电力技术经济》2006,18(6):51-53,31
介绍了小型冷热电联产系统的特点和主要设备的现状.阐述了如何在西气东输的前提下,大力发展以小型、清洁冷热电联产为代表的第二代能源系统,促进国民经济的发展.  相似文献   
997.
野生纤维之王——罗布麻   总被引:7,自引:0,他引:7  
文章阐述了罗布麻纤维的物质组成、形态结构,探索了提取罗布麻纤维的初加工工艺流程,分析了其药用价值和纺织保健开发价值。  相似文献   
998.
This paper reports on the results of a survey and qualitative analysis on the teaching of ‘Basic Design’ in schools of design and architecture located in 22 countries. In the context of this research work, Basic Design means the teaching and learning of design fundamentals that may also be commonly referred to as the Principles of Two- and Three-dimensional Design. The body of knowledge associated with Basic Design may be regarded as part of the general theory of teaching and learning design as practiced in many design schools and which has its origins in the classical design schools such as the Bauhaus. In the author’s perception and practice, the pedagogy of Basic Design promotes a holistic, creative and experimental methodology that develops the learning style and cognitive abilities of students with respect to the fundamental principles of design. This includes an understanding of the elements of shape, colour, texture, light, and rhythm in a manner complementary but usually unrelated to the common design methods teaching approach. As is well known among design practitioners, including architects and industrial designers, a deep understanding of the purpose of these fundamental design elements and principles is still relevant to contemporary design practice. The main objective of the research described in this paper was to determine the status and development of Basic Design pedagogy in a significant number of contemporary design schools. On the basis of the results of two surveys conducted in 2001–2002, this paper will identify and illustrate interesting aspects concerning the programmes and organisation of courses delivered by teachers of ‘Basic Design’. This work will also survey the viewpoints of Basic Design teachers in elementary years of design courses and of those teaching design through projects during the subsequent years of the same courses. Interestingly, the design project teachers surveyed in this research expressed a desire to be more involved in the teaching of Basic Design fundamentals which indicates strongly that Basic Design principles are still relevant in contemporary design education terms as they have ever been and that more research is needed in order to better understand and apply the related pedagogy.  相似文献   
999.
What happens when educational ideas cross national and cultural borders? How do teachers respond to ideas originating in a different school system and a different national culture? This article reports on an empirical study investigating the transfer of ideas from Design &; Technology as a subject in England and Wales into Norwegian schools. A sample of teachers participating in a specific project on technology teaching inspired by this subject has been studied by means of interviews and classroom observation. Results of the study show that while some elements of Design &; Technology are adopted by the teachers, essential ideas of the subject are significantly transformed. Drawing on Barnes, (1992, Teachers and Teaching: From Classrooms to Reflection (pp. 9–32), The Falmer press, London) concept of teachers' professional frames for teaching, it is shown how specific aspects of the national and educational culture have had a considerable effect on?the teachers' interpretation of the nature of technology as a subject of teaching and its place in the curriculum. The study illustrates the importance of the cultural context in how educational ideas are interpreted, reshaped and realized in schools.  相似文献   
1000.
火电厂生产经营风险控制管理   总被引:1,自引:1,他引:1  
对火电厂目前面临的主要生产经营风险及其特点进行了介绍,在此基础上,论述了进行风险控制的必要性,提出了火电厂生产经营风险控制的总体对策和具体应对方法。  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号