全文获取类型
收费全文 | 3576篇 |
免费 | 156篇 |
专业分类
各国政治 | 210篇 |
工人农民 | 99篇 |
世界政治 | 350篇 |
外交国际关系 | 260篇 |
法律 | 1479篇 |
中国共产党 | 2篇 |
中国政治 | 37篇 |
政治理论 | 1253篇 |
综合类 | 42篇 |
出版年
2021年 | 29篇 |
2020年 | 44篇 |
2019年 | 70篇 |
2018年 | 106篇 |
2017年 | 115篇 |
2016年 | 113篇 |
2015年 | 76篇 |
2014年 | 94篇 |
2013年 | 597篇 |
2012年 | 77篇 |
2011年 | 105篇 |
2010年 | 96篇 |
2009年 | 109篇 |
2008年 | 104篇 |
2007年 | 100篇 |
2006年 | 108篇 |
2005年 | 115篇 |
2004年 | 103篇 |
2003年 | 95篇 |
2002年 | 116篇 |
2001年 | 76篇 |
2000年 | 79篇 |
1999年 | 66篇 |
1998年 | 59篇 |
1997年 | 60篇 |
1996年 | 38篇 |
1995年 | 51篇 |
1994年 | 58篇 |
1993年 | 52篇 |
1992年 | 40篇 |
1991年 | 53篇 |
1990年 | 35篇 |
1989年 | 50篇 |
1988年 | 29篇 |
1987年 | 36篇 |
1986年 | 40篇 |
1985年 | 41篇 |
1984年 | 31篇 |
1983年 | 43篇 |
1982年 | 41篇 |
1981年 | 50篇 |
1980年 | 36篇 |
1979年 | 39篇 |
1978年 | 35篇 |
1977年 | 19篇 |
1976年 | 32篇 |
1975年 | 17篇 |
1974年 | 19篇 |
1973年 | 20篇 |
1969年 | 17篇 |
排序方式: 共有3732条查询结果,搜索用时 0 毫秒
331.
332.
Biochar currently attracts technological and market optimism, promising multiple wins – for climate change, food security, bioenergy and health – not least for African farmers. This paper examines the political-economic and discursive processes constructing biochar as a novel green commodity, creating new alliances amongst scientists, businesses, venture capital firms and non-governmental organisations. Carbon market logics are not only threatening large-scale land grabs for biochar feedstocks but also other forms of resource, labour and ecological appropriation through driving research and development and shaping small-scale pilot projects. In these, soil carbon is ‘chopped out’ of its ecosystem and social contexts and revalued as exchangeable pieces of carbon nature. Farmers are hailed as green actors and market winners, provided they discipline their practices according to these new technical and market logics. These discourses contrast strongly with the farmers' existing conceptual and practical repertoires; a case study from Liberia illustrates how farmers already manipulate soil carbon in creating locally valued anthropogenic dark earths, but within diverse farming repertoires, ontologies of human–nature interrelationship and historical and political ecologies. 相似文献
333.
James Petras 《The Journal of peasant studies》2013,40(3):476-528
In the midst of an accelerating capitalist crisis, the enthusiasm of many academic commentators for social movements as a form of grassroots political agency capable of successfully resisting a globally rampant capitalism has not abated. This despite the weight of evidence to the contrary, which indicates that in Latin America the interests of farmers and smallholding peasants belonging to these movements are not best served by engaging with center-left parliamentary politics. Case studies of such alliance-building examined here include social movements in Argentina, Brazil, Bolivia, Ecuador and Venezuela, and also Mexico, Costa Rica, Peru, Colombia, Chile, the Dominican Republic and Haiti. 相似文献
334.
335.
In this note, new data concerning the agrarian structure of Bangladesh are employed to test the efficacy of ceilings on the size of landholdings as a means of making land available to the landless and the near landless. The data confirm that the numbers of potential claimants for land far exceeds the potential supply, even if ceilings on holdings were lowered from 100 standard bighas (331/3 acres) to 25 standard bighas (81/3 acres). 相似文献
336.
James Edward David 《Intelligence & National Security》2017,32(6):768-781
This article examines the requirements for high and very high resolution photography of the USSR and other denied areas during the Cold War. It discusses the partial success of GAMBIT-1 and the much greater success of GAMBIT-3 beginning in 1966 in acquiring the former. The article reviews the development of the Manned Orbiting Laboratory (MOL) in the same period to collect very high resolution photography, the rationale for it, and the major technical and financial problems the program soon experienced. It then describes the debate beginning in 1968 over the value of this imagery considering the MOL’s costs and the growing success of GAMBIT-3, and these and the other factors that led President Richard Nixon to cancel the program the following year. 相似文献
337.
338.
339.
340.