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   43436篇
  免费   1197篇
  国内免费   5篇
财政金融   6889篇
工业经济   2845篇
计划管理   6464篇
经济学   8768篇
综合类   427篇
运输经济   238篇
旅游经济   582篇
贸易经济   5797篇
农业经济   1767篇
经济概况   4993篇
水利工程   5741篇
邮电经济   127篇
  2021年   294篇
  2020年   423篇
  2019年   616篇
  2018年   884篇
  2017年   877篇
  2016年   887篇
  2015年   591篇
  2014年   922篇
  2013年   3929篇
  2012年   1377篇
  2011年   1452篇
  2010年   1012篇
  2009年   1224篇
  2008年   1334篇
  2007年   1380篇
  2006年   1297篇
  2005年   1272篇
  2004年   1263篇
  2003年   934篇
  2002年   829篇
  2001年   847篇
  2000年   819篇
  1999年   757篇
  1998年   748篇
  1997年   761篇
  1996年   695篇
  1995年   629篇
  1994年   658篇
  1993年   729篇
  1992年   721篇
  1991年   707篇
  1990年   642篇
  1989年   563篇
  1988年   559篇
  1987年   560篇
  1986年   559篇
  1985年   756篇
  1984年   708篇
  1983年   722篇
  1982年   698篇
  1981年   623篇
  1980年   606篇
  1979年   641篇
  1978年   531篇
  1977年   482篇
  1976年   410篇
  1975年   366篇
  1974年   361篇
  1973年   344篇
  1972年   277篇
排序方式: 共有10000条查询结果,搜索用时 296 毫秒
71.
The introduction of traffic management schemes has been one response of the National Parks to the problem of ever-increasing car-borne visitors and the consequent damage caused to the rural environment. By reviewing these schemes and by determining and explaining attitudes towards one particular traffic management experiment, the paper aims to deduce lessons for future policy. The analysis, based on two visitor surveys, suggests that the likelihood of success is improved when schemes are integrated, containing both ‘carrot’ and ‘stick’ elements. Since public perceptions are also found to be pivotal to its success, appropriate marketing of a scheme is vital. The paper concludes, however, that to achieve the fundamental objective of greater accessibility with less mobility, a more wide-ranging marketing effort is required intended to engender a sea change in attitude towards both the car and public transport.  相似文献   
72.
73.
74.
Intensive fertilizer use has led to nitrate contamination of groundwater in many areas. This article examines the possibility of removing nitrates through the construction of artificial wetlands. A pilot study conducted in Denmark has found that the method is effective and economical, at least for small waterworks, though further treatment is necessary before an acceptable microbiological water quality is attained.  相似文献   
75.

The paper deals with effects of price changes on measurement of poverty. It is shown that there are situations, when prices and nominal incomes change, a higher nutritional intake or an increase in commodity consumption of the poor can be associated with higher poverty gaps and a higher poverty index of the society. A positive relationship of this kind is quite counter-intuitive in the context of poverty measurement. This is caused by the adjustment of the poverty line and/or incomes of one situation by the prices of the other for the purpose of comparison.

  相似文献   
76.
In social project appraisal, the policy profile of both distributional welfare weights and the social discount rate has risen considerably in recent years. This fact has important implications for the allocation of funds to social projects and policies in countries, and in unions of countries such as the EU. A key component in the formulae for both welfare weights and the social discount rate is the elasticity of marginal utility of consumption, e. A critical review of existing evidence on e suggests that the UK Treasury's preferred value of unity is too low. New evidence presented in this paper, based on the structure of personal income tax rates, suggests that, on average, for developed countries e is close to 1.4. This particular approach to the estimation of e has previously been under‐utilised by researchers.  相似文献   
77.
The 1992–93 recession in the western states of Germany has been attributed, in substantial measure, to the macroeconomic consequences of policies to finance unification. Studies of the costs of unification have not attempted to measure the burden of the recession. We estimate a dynamic, panel model of household incomes using data from the German Socio-Economic Panel (GSOEP) and use it to forecast what these incomes would have been in 1992–94 without a recession. Using a ratio of actual to forecast incomes, we compare the relative burden of the recession across households. Our findings suggest that western households below the median income bore the brunt of the combined impact of unification and the recession of 1992–93.
JEL classification: P3, D3, E3.  相似文献   
78.
79.
80.
威维霍抽水蓄能电站对昆士兰电网及其业主塔朗能源公司起着重要作用。  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