全文获取类型
收费全文 | 2884篇 |
免费 | 83篇 |
专业分类
财政金融 | 626篇 |
工业经济 | 191篇 |
计划管理 | 455篇 |
经济学 | 608篇 |
综合类 | 51篇 |
运输经济 | 14篇 |
旅游经济 | 45篇 |
贸易经济 | 614篇 |
农业经济 | 90篇 |
经济概况 | 273篇 |
出版年
2023年 | 25篇 |
2021年 | 28篇 |
2020年 | 49篇 |
2019年 | 66篇 |
2018年 | 66篇 |
2017年 | 72篇 |
2016年 | 80篇 |
2015年 | 45篇 |
2014年 | 73篇 |
2013年 | 296篇 |
2012年 | 83篇 |
2011年 | 97篇 |
2010年 | 92篇 |
2009年 | 90篇 |
2008年 | 84篇 |
2007年 | 108篇 |
2006年 | 91篇 |
2005年 | 78篇 |
2004年 | 76篇 |
2003年 | 72篇 |
2002年 | 81篇 |
2001年 | 56篇 |
2000年 | 55篇 |
1999年 | 67篇 |
1998年 | 63篇 |
1997年 | 38篇 |
1996年 | 53篇 |
1995年 | 54篇 |
1994年 | 48篇 |
1993年 | 23篇 |
1992年 | 41篇 |
1991年 | 39篇 |
1990年 | 28篇 |
1989年 | 33篇 |
1988年 | 23篇 |
1986年 | 26篇 |
1985年 | 57篇 |
1984年 | 46篇 |
1983年 | 44篇 |
1982年 | 38篇 |
1981年 | 32篇 |
1980年 | 37篇 |
1979年 | 38篇 |
1978年 | 33篇 |
1977年 | 34篇 |
1976年 | 25篇 |
1975年 | 26篇 |
1974年 | 33篇 |
1973年 | 16篇 |
1972年 | 16篇 |
排序方式: 共有2967条查询结果,搜索用时 15 毫秒
21.
Jeff Crowther 《中国对外贸易(英文版)》2011,(21)
After residing in Beijing for over 6 years, many of my friends and colleagues in the d3.S. have said, Wow, it must be amazing living in China". Over the years I have to say, my experiences have been am... 相似文献
22.
23.
Medieval bishops condemned and restricted the sale of corrodies (a type of annuity), partly on the grounds of their perceived unprofitability. The available data on the profitability of corrodies is limited and little analysed, and the episcopal condemnation of corrodies has been adopted by modern researchers. After recognising the difficulties, this paper applies an annuity pricing model to study corrody pricing. Given various assumptions, contrary to the established view, it is argued that the sale of corrodies was financially profitable for institutions. Finally, some reasons are considered for the negative attitude of contemporary and historical opinion towards the sale of corrodies. 相似文献
24.
25.
26.
27.
28.
29.
30.
Charles M. Sheppard 《Process Safety Progress》1992,11(4):229-237
The behavior of an open system is modeled. Thus, for special cases, the void fraction is predicted as a function of location and time. The open system may be an open vessel or a vessel with an open relief device. A single governing equation is derived based on combining the material and energy balances with the churn-turbulent drift flux relationship and assuming no radial gradients. This partial differential equation is not solved. It is, however, bounded by homogeneous and all vapor venting. These special cases are solved. In homogeneous venting the key variable is time. In all vapor venting under pseudo-steady-state conditions the key variable is location. The solution of the partial differential equation is also discussed. Under pseudo-steady-state and churn-turbulent conditions, the open system is modeled. The minimum void fractions (corresponding to a maximum liquid inventory) with all vapor venting, for vertical, horizontal, and spherical vessels are predicted and compared. Analytical expressions for the local and average void fractions in a vertical vessel and non-unity distribution parameters are presented. Void fraction profiles are compared for three cases: 1. vertical cylinders with distribution parameters (Co values) of unity and 1.5, 2. horizontal and vertical cylinders with varying L/D ratios, and 3. spheres with inscribed vertical cylinders having constant gas production to bubble rise ratio (Ψ′ value). The vertical cylinder average void fraction for non-unity distribution parameters can now be calculated analytically. The horizontal cylinder average void fraction predicted by turning it upright results in an over prediction of at most 4%. The sphere average void fraction predicted via an inscribed vertical cylinder, with the same Ψ′ value, is consistenly high by at most 8%. 相似文献