全文获取类型
收费全文 | 3718篇 |
免费 | 245篇 |
国内免费 | 10篇 |
专业分类
财政金融 | 28篇 |
工业经济 | 198篇 |
计划管理 | 1299篇 |
经济学 | 447篇 |
综合类 | 188篇 |
运输经济 | 2篇 |
旅游经济 | 26篇 |
贸易经济 | 134篇 |
农业经济 | 1364篇 |
经济概况 | 287篇 |
出版年
2024年 | 19篇 |
2023年 | 64篇 |
2022年 | 131篇 |
2021年 | 86篇 |
2020年 | 105篇 |
2019年 | 101篇 |
2018年 | 117篇 |
2017年 | 101篇 |
2016年 | 140篇 |
2015年 | 201篇 |
2014年 | 276篇 |
2013年 | 210篇 |
2012年 | 343篇 |
2011年 | 407篇 |
2010年 | 377篇 |
2009年 | 195篇 |
2008年 | 173篇 |
2007年 | 193篇 |
2006年 | 227篇 |
2005年 | 172篇 |
2004年 | 86篇 |
2003年 | 64篇 |
2002年 | 46篇 |
2001年 | 50篇 |
2000年 | 25篇 |
1999年 | 15篇 |
1998年 | 6篇 |
1997年 | 10篇 |
1996年 | 10篇 |
1995年 | 6篇 |
1994年 | 2篇 |
1993年 | 7篇 |
1992年 | 4篇 |
1985年 | 2篇 |
1984年 | 2篇 |
排序方式: 共有3973条查询结果,搜索用时 250 毫秒
71.
72.
73.
为避免单一勘探方法的多解性,提高勘探的准度与精度,在某区的物探找水实践中,综合运用高密度电阻率法,对称四极电测深法、电阻率测井三种方法进行勘探,查明目标井位附近区域的岩性,推断地层的含水性,并根据勘探结果划定钻井布设的合理位置。 相似文献
74.
自来水经过一定的处理工艺,然后经过配送管网输送至各户。水在配送管网中流动的过程中,往往会受到管网、供水管道及附属设备的影响,造成二次污染。因此,要切实做好城市供水二次污染的防治工作,提高人们的生活质量。基于此,本文提出了城市供水二次污染的几点原因和一般性的治理对策。 相似文献
75.
疏浚大多用于河道的过分淤积,拓宽则用于通水隘口的消除。而随着时空的演变河床疏浚与河槽拓宽的进行所需考虑的因子越来越多,故疏浚进行前应尽量考量整个河道的河性以及施工后可能引致的变动,使能维持预期的效果,并避免造成负面效应。本文主要以涧河为研究对象,利用NETSTARS拟似二维水理输砂模式,探讨河道疏浚后的水理与输砂演变趋势等相关课题。 相似文献
76.
Malini Ranganathan 《International journal of urban and regional research》2014,38(2):590-608
This article interrogates the nature of political agency deployed at sites of market‐oriented water reforms. It presents a case study from Bangalore, India of a water project mandating significant ‘beneficiary’ cash contributions from lower‐middle‐class dwellers for the capital cost of extending piped water to the city's peripheries. Drawing on quantitative and ethnographic data, it illustrates why property owners who lack formal water access and land tenure — groups referred to in this article as the ‘peripheralized middle class’ — consent to paying for pipes rather than resist all together despite the high cost involved. It argues that far from reflecting an internalization of a ‘willingness to pay’ or ‘stakeholder’ ethos celebrated by development practitioners today, payment for water provides an insurgent means to bargain for greater symbolic recognition, respectability and material benefits from the state. In particular, payment for pipes enables peripheral dwellers to strengthen their claims to secure land tenure in an era of exclusionary and punitive spatial policies. Payment thus comprises a terrain of contested meaning making and political struggle, at the heart of which lie the stakes of urban citizenship. In documenting the process by which property related interests and tenure claims are advanced under a scenario of reforms, this article contributes to Gramscian political‐ecological conversations on subaltern political agency and the lived character of hegemony in urban environments. 相似文献
77.
Maria A. Garcia‐Valiñas Wasantha Athukorala Clevo Wilson Benno Torgler Robert Gifford 《The Australian journal of agricultural and resource economics》2014,58(2):185-204
Several studies published in the last few decades have demonstrated a low price‐elasticity for residential water use. In particular, it has been shown that there is a quantity of water demanded that remains constant regardless of prices and other economic factors. In this research, we characterise residential water demand based on a Stone‐Geary utility function. This specification is not only theory‐compatible but can also explicitly model a minimum level of consumption not dependent on prices or income. This is described as minimum threshold or nondiscretionary water use. Additionally, the Stone‐Geary framework is used to model the subsistence level of water consumption that is dependent on the temporal evolution of consumer habits and stock of physical capital. The main aim of this study is to analyse the impact of water‐saving habits and water‐efficient technologies on residential water demand, while additionally focusing attention on nondiscretionary uses. This is informed by an empirical application using data from a survey conducted among residents of Brisbane City Council, Australia. The results will be especially useful in the design of water tariffs and other water‐saving policies. 相似文献
78.
Mark Zeitoun Heather Elaydi Jean‐Philippe Dross Michael Talhami Evaristo de Pinho‐Oliveira Javier Cordoba 《International journal of urban and regional research》2017,41(6):904-925
This article assesses the impact of armed conflict on the drinking water service of Basrah from 1978 to 2013 through an ‘urban warfare ecology’ lens in order to draw out the implications for relief programming and relevance to urban studies. It interprets an extensive range of unpublished literature through a frame that incorporates the accumulation of direct and indirect impacts upon the hardware, consumables and people upon which urban services rely. The analysis attributes a step‐wise decline in service quality to the lack of water treatment chemicals, lack of spare parts, and, primarily, an extended ‘brain‐drain’ of qualified water service staff. The service is found to have been vulnerable to dependence upon foreign parts and people, ‘vicious cycles’ of impact, and the politics of aid and of reconstruction. It follows that practitioners and donors eschew ideas of relief–rehabilitation–development (RRD) for an appreciation of the needs particular to complex urban warfare biospheres, where armed conflict and sanctions permeate all aspects of service provision through altered biological and social processes. The urban warfare ecology lens is found to be a useful complement to ‘infrastructural warfare’ research, suggesting the study of protracted armed conflict upon all aspects of urban life be both deepened technically and broadened to other cases. 相似文献
79.
矿井水害的预防预报是指查清矿井水文地质条件,对水害做出分析判断。本文以山西成家庄煤矿防治水为例,分析了矿井充水因素,以理论结合实际,为预防矿井水害提供依据。 相似文献
80.
滑宇翔 《西安财经学院学报》2014,(3):94-97
长久以来,前辈学人对于《史记》中平阳君赵豹“秦以牛田(之)水通粮”一语解释多有不同,或以为是秦“以牛耕田,以水漕粮”,或以为是秦“以发源于‘牛田’之地的河流进行漕粮”,但均未形成定论。本文认为,先秦时期关中水资源丰富,渭河支流多可航运,加上关中水利发达,于是秦国利用与渭河支流连通的田间大渠——“浍”渠进行粮食漕运,即所谓“秦以牛田水通粮”。且战国后期,随着秦对外战争规模的扩大,粮秣耗费日增,使用“牛田水通粮”已十分必要。 相似文献