全文获取类型
收费全文 | 2834篇 |
免费 | 38篇 |
专业分类
各国政治 | 119篇 |
工人农民 | 178篇 |
世界政治 | 153篇 |
外交国际关系 | 117篇 |
法律 | 1725篇 |
中国政治 | 23篇 |
政治理论 | 536篇 |
综合类 | 21篇 |
出版年
2021年 | 21篇 |
2020年 | 23篇 |
2019年 | 29篇 |
2018年 | 107篇 |
2017年 | 49篇 |
2016年 | 131篇 |
2015年 | 38篇 |
2014年 | 43篇 |
2013年 | 260篇 |
2012年 | 156篇 |
2011年 | 123篇 |
2010年 | 37篇 |
2009年 | 45篇 |
2008年 | 41篇 |
2007年 | 45篇 |
2006年 | 63篇 |
2005年 | 419篇 |
2004年 | 143篇 |
2003年 | 51篇 |
2002年 | 46篇 |
2001年 | 42篇 |
2000年 | 31篇 |
1999年 | 34篇 |
1998年 | 17篇 |
1997年 | 18篇 |
1996年 | 26篇 |
1995年 | 16篇 |
1994年 | 16篇 |
1992年 | 33篇 |
1991年 | 45篇 |
1990年 | 46篇 |
1989年 | 56篇 |
1988年 | 49篇 |
1987年 | 42篇 |
1986年 | 47篇 |
1985年 | 37篇 |
1984年 | 46篇 |
1983年 | 35篇 |
1981年 | 19篇 |
1980年 | 22篇 |
1979年 | 23篇 |
1978年 | 24篇 |
1976年 | 16篇 |
1975年 | 23篇 |
1974年 | 36篇 |
1973年 | 22篇 |
1972年 | 28篇 |
1971年 | 21篇 |
1970年 | 19篇 |
1968年 | 15篇 |
排序方式: 共有2872条查询结果,搜索用时 15 毫秒
1.
VwGH ?sterreich 《Natur und Recht》2006,8(4):198-203
Keine Zusammenfassung 相似文献
2.
3.
Stab wounds were made in parenchymatous organs (e.g. liver, spleen, kidneys, lungs) using a variety of instruments. The shape of the resulting canal was investigated by X-ray analysis after introduction of an X-ray contrast medium. The best contrast was obtained using a contrast medium containing barium. The shape of the canal gave a direct representation of the outline of the instrument used. The width of the canal was however, always several millimeters smaller than the corresponding blade of the instrument. The position of the blade back in single-edged blades could be demonstrated with stronger contrast. 相似文献
4.
George M. Guess 《公共行政管理与发展》1991,11(6):573-589
The failure of forestry to contribute to poverty reduction in Central America is due to public policies which inhibit its profitability. Absence of public regulation of harvesting and competing subsidies to agriculture keep forestry stumpage prices artificially low. This encourages destruction of the forest resource, which damages both the environment and the potential to reduce poverty. A comparison of Costa Rica and Honduras reveals two dissimilar approaches toward forest policy. While Costa Rica attempts to raise producer and grower stumpage prices by tax credits, soft loans and differential species fees, Honduras enforces price ceilings and uses centralized authority to control forest production and export. Both countries exhibit weaknesses in the management control cycle of programming, budgeting, implementing and evaluating their forest policies. Yet the Costa Rican approach has increased stumpage prices already, which bodes well for their forest sector. By contrast, the major beneficiary of Honduran forest policy has been COHDEFOR, the state enterprise responsible for forestry management, controlling production, and running its national system of agroforestry cooperatives. Despite greater public authority and resources than the Costa Rican forest service (DGF), the Honduran forest policy is not likely to increase producer profitability or reduce poverty in the near future. 相似文献
5.
6.
7.
8.
9.
A report of an international collaborative experiment to demonstrate the uniformity obtainable using DNA profiling techniques. 总被引:2,自引:0,他引:2
P Gill S Woodroffe W B?r B Brinkmann A Carracedo B Eriksen S Jones A D Kloosterman B Ludes B Mevag 《Forensic science international》1992,53(1):29-43
This paper describes a collaborative exercise intended to demonstrate whether uniformity of DNA profile results could be achieved between different European laboratories. It was shown that this goal can be obtained provided that a common protocol is followed (specifically the use of a common electrophoretic buffer as being the most important parameter). Generally, lower molecular weight loci (with lower molecular weight fragments) such as YNH24 perform better than higher molecular weight loci such as MS43a. The results of the exercise are discussed in relation to the objectives of the European DNA profiling group (EDNAP). 相似文献
10.