全文获取类型
收费全文 | 1073篇 |
免费 | 68篇 |
专业分类
各国政治 | 55篇 |
工人农民 | 40篇 |
世界政治 | 107篇 |
外交国际关系 | 130篇 |
法律 | 471篇 |
中国政治 | 4篇 |
政治理论 | 325篇 |
综合类 | 9篇 |
出版年
2023年 | 10篇 |
2022年 | 3篇 |
2021年 | 6篇 |
2020年 | 28篇 |
2019年 | 35篇 |
2018年 | 35篇 |
2017年 | 54篇 |
2016年 | 62篇 |
2015年 | 38篇 |
2014年 | 40篇 |
2013年 | 151篇 |
2012年 | 35篇 |
2011年 | 54篇 |
2010年 | 38篇 |
2009年 | 40篇 |
2008年 | 38篇 |
2007年 | 26篇 |
2006年 | 35篇 |
2005年 | 40篇 |
2004年 | 42篇 |
2003年 | 40篇 |
2002年 | 28篇 |
2001年 | 17篇 |
2000年 | 26篇 |
1999年 | 17篇 |
1998年 | 17篇 |
1997年 | 15篇 |
1996年 | 11篇 |
1995年 | 9篇 |
1994年 | 7篇 |
1993年 | 16篇 |
1992年 | 8篇 |
1991年 | 14篇 |
1990年 | 14篇 |
1989年 | 10篇 |
1988年 | 6篇 |
1987年 | 8篇 |
1985年 | 11篇 |
1984年 | 5篇 |
1983年 | 7篇 |
1982年 | 6篇 |
1981年 | 3篇 |
1980年 | 5篇 |
1979年 | 3篇 |
1978年 | 4篇 |
1977年 | 4篇 |
1975年 | 5篇 |
1974年 | 4篇 |
1972年 | 3篇 |
1970年 | 2篇 |
排序方式: 共有1141条查询结果,搜索用时 0 毫秒
51.
There is no shortage of warnings concerning the hazards of excessive ambition in consciously-pursued public policy. In the light of these cautions, this paper considers the appropriate ambitions for policy design. The critics have missed the target. There is no need to fear ambition in policy design, provided that openness in communications about policy is secured. 相似文献
52.
53.
Intramyocardial small vessel abnormalities are not commonly recognized. The best known abnormality is fibromuscular dysplasia involving the sinoatrial or atrioventricular nodal arteries. Small vessel disease has been reported as an isolated cardiac anomaly in individuals with sudden death, and may also be associated with other cardiac conditions including hypertrophic cardiomyopathy and mitral valve prolapse. The nature of the association is unknown, and the mechanism causing sudden death is sometimes obscure. We describe pathological changes of the intramyocardial small vessels of three individuals with sudden death. Abnormalities involved small vessels at different levels. In all the cases, the abnormalities were thought to have caused or contributed to the individual's death. The possible mechanisms of this are discussed. 相似文献
54.
55.
56.
The purpose of this highly speculative article is to assess a broad range of possible developments in Cuba over the next five
to seven years that could directly and adversely affect U.S. interests. By definition, therefore, it does not provide equal
treatment to more optimistic and, salubrious scenarios. A key assumption is that the Cuban economy will not sustain a strong
rebound to high levels of growth. Specific observations about how security challenges might impact certain U.S. government
activities are also included according to the article’s terms of reference. No attempt is made to assign numerical or other
probabilities to the counterfactual cases discussed. Finally, the future time frame examined includes treatments of a continuation
of Fidel Castro's regime as well as the emergence of one or more successor governments.
Brian Latell has been teaching courses on Cuba and Latin America at, Georgetown University for the past twenty-one years.
He has written and lectured on Cuba, Mexico, and U.S. Foreign Intelligence Issues. In 1998 he co-editedEye in the Sky: The Story of the Corona Spy Satellites, published by the Smithsonian Press. He served as National Intelligence Officer for Latin America at the National Intelligence
Council between 1990–1994. From 1994–1998 he was Director of the Center for the Study of Intelligence at CIA and chaired the
Editorial Board ofStudies In Intelligence. Last year he retired from government service, and was awarded the Distinguished Intelligence Medal. 相似文献
57.
58.
59.
The use of a new technique, Fourier transform infrared (FTIR) chemical imaging, has been demonstrated for the enhancement of latent fingermarks on a number of surfaces. Images of untreated fingermarks on glass backgrounds with excellent ridge detail were acquired using infrared chemical imaging. High quality fingermarks on glass backgrounds were also developed using ethyl cyanoacrylate (super glue) fuming and subsequent infrared chemical imaging. This new method allows the collection of images from backgrounds that traditionally pose problems for current fingermark detection methods. The background may, for example, be highly colored, have a complex pattern, or possess other pattern or image characteristics that make it difficult to separate fingermark ridges using traditional optical or luminescent visualization. One background that has proven to be a challenging surface for the development of latent fingermarks is the Australian polymer banknote. To demonstrate the power and applicability of infrared chemical imaging, fingermarks fumed with ethyl cyanoacrylate were successfully imaged from Australian polymer banknotes. 相似文献
60.