全文获取类型
收费全文 | 24598篇 |
免费 | 256篇 |
专业分类
财政金融 | 4306篇 |
工业经济 | 1444篇 |
计划管理 | 3853篇 |
经济学 | 5532篇 |
综合类 | 567篇 |
运输经济 | 95篇 |
旅游经济 | 164篇 |
贸易经济 | 6080篇 |
农业经济 | 244篇 |
经济概况 | 1896篇 |
信息产业经济 | 48篇 |
邮电经济 | 625篇 |
出版年
2023年 | 57篇 |
2022年 | 47篇 |
2021年 | 80篇 |
2020年 | 120篇 |
2019年 | 197篇 |
2018年 | 2467篇 |
2017年 | 2241篇 |
2016年 | 1393篇 |
2015年 | 260篇 |
2014年 | 357篇 |
2013年 | 1007篇 |
2012年 | 735篇 |
2011年 | 2229篇 |
2010年 | 2095篇 |
2009年 | 1852篇 |
2008年 | 1795篇 |
2007年 | 2105篇 |
2006年 | 317篇 |
2005年 | 653篇 |
2004年 | 683篇 |
2003年 | 768篇 |
2002年 | 480篇 |
2001年 | 255篇 |
2000年 | 220篇 |
1999年 | 176篇 |
1998年 | 159篇 |
1997年 | 152篇 |
1996年 | 136篇 |
1995年 | 118篇 |
1994年 | 125篇 |
1993年 | 113篇 |
1992年 | 107篇 |
1991年 | 95篇 |
1990年 | 65篇 |
1989年 | 74篇 |
1988年 | 69篇 |
1987年 | 66篇 |
1986年 | 81篇 |
1985年 | 113篇 |
1984年 | 91篇 |
1983年 | 81篇 |
1982年 | 90篇 |
1981年 | 67篇 |
1980年 | 76篇 |
1979年 | 67篇 |
1978年 | 58篇 |
1977年 | 61篇 |
1976年 | 56篇 |
1974年 | 32篇 |
1972年 | 21篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
42.
43.
44.
45.
High transaction costs are detrimental to the efficient operation or existence of markets for inputs and outputs. The cost of information and the costs associated with the search for trade partners, the distance to formal markets and contract enforcement are likely to influence the marketing of food crops. This study hypothesises that the level of income generated from food-crop sales by small-scale farmers in the Impendle and Swayimana districts of KwaZuluNatal is influenced by transaction costs and certain household and farm characteristics. Regression analysis shows that the depth of marketing methods is significantly influenced by transaction cost proxies, such as cooperation with large commercial farmers and ownership of means of transport. Results from a block-recursive regression analysis show that the level of crop income generated is determined by the depth of marketing methods, the size of allocated arable land and off-farm income. Households with lower transaction costs, sizeable allocated land and off-farm income can be expected to generate higher income from food crops. Investment in public goods such as roads, telecommunications and an efficient legal system (to uphold commercial contracts), as well as farmer support services (input supply, extension, marketing information and research), would probably raise farm and non-farm income by reducing transaction costs. This would increase the effective demand for locally produced goods and services, thus contributing to rural employment and livelihoods within rural communal areas. 相似文献
46.
47.
Ricki Nusser-Müller-Busch 《Heilberufe》2011,63(6):22-24
Mehr Sicherheit im Umgang mit Trachealkanülen - Pflegende, die Patienten mit einer Trachealkanüle betreuen, müssen den Kanülenwechsel sicher beherrschen. Denn bei Komplikationen kann das Warten auf den Arzt katastrophale Folgen haben. Daher muss der Umgang mit den Kanülen zur Routine werden. 相似文献
48.
49.
Matthew T. Cole 《Review of World Economics》2011,147(3):411-427
There has been great focus in the recent trade theory literature on the introduction of firm heterogeneity into trade models. This introduction has highlighted the importance of the entry/exit decision of firms in response to changes in trade barriers. However, it is typical in many of these models to use iceberg transport costs as a general form of trade barriers that can be interchangeable with ad valorem tariffs. I show that this is not always an appropriate conclusion. Specifically, I illustrate that profit for an exporter is more elastic in response to tariffs than iceberg transport costs, which affects the entry/exit decision of firms. This has implications for welfare analysis and empirical specifications. 相似文献
50.
Most extant work on prediction of banking crises has utilised global samples, which are in turn dominated by observations from middle-income countries, and rely on a single estimator. However, economic and financial structures as well as the pattern of shocks may differ substantially across regions, while a range of specifications is desirable to check robustness. Accordingly, in this paper we test the implicit pooling assumption in earlier multivariate work on Early Warning Systems using both logit and binary recursive tree specifications separately for crises in Asia and Latin America, as well as the pooled sample. Results suggest markedly different crisis determinants across regions, implying global samples are inappropriate. 相似文献