全文获取类型
收费全文 | 22023篇 |
免费 | 722篇 |
国内免费 | 5篇 |
专业分类
各国政治 | 974篇 |
工人农民 | 890篇 |
世界政治 | 1523篇 |
外交国际关系 | 761篇 |
法律 | 13834篇 |
中国共产党 | 6篇 |
中国政治 | 186篇 |
政治理论 | 4346篇 |
综合类 | 230篇 |
出版年
2020年 | 286篇 |
2019年 | 348篇 |
2018年 | 454篇 |
2017年 | 504篇 |
2016年 | 510篇 |
2015年 | 384篇 |
2014年 | 396篇 |
2013年 | 2125篇 |
2012年 | 562篇 |
2011年 | 613篇 |
2010年 | 520篇 |
2009年 | 537篇 |
2008年 | 616篇 |
2007年 | 659篇 |
2006年 | 664篇 |
2005年 | 594篇 |
2004年 | 575篇 |
2003年 | 619篇 |
2002年 | 539篇 |
2001年 | 828篇 |
2000年 | 677篇 |
1999年 | 606篇 |
1998年 | 330篇 |
1997年 | 248篇 |
1996年 | 258篇 |
1995年 | 238篇 |
1994年 | 261篇 |
1993年 | 267篇 |
1992年 | 413篇 |
1991年 | 475篇 |
1990年 | 448篇 |
1989年 | 398篇 |
1988年 | 429篇 |
1987年 | 409篇 |
1986年 | 443篇 |
1985年 | 407篇 |
1984年 | 348篇 |
1983年 | 343篇 |
1982年 | 260篇 |
1981年 | 271篇 |
1980年 | 211篇 |
1979年 | 260篇 |
1978年 | 186篇 |
1977年 | 159篇 |
1976年 | 157篇 |
1975年 | 178篇 |
1974年 | 196篇 |
1973年 | 154篇 |
1972年 | 151篇 |
1969年 | 142篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
921.
922.
923.
924.
JIANG WANDI 《北京周报(英文版)》2011,54(14):2
<正>In an early morning in July 1945,a strange mushroom cloud a rose in the basin of northern New Mexico,the United States,splitting the dark sky with brilliant light.That was not the first twilight of another day,but the twilight of the atomic age.Dramatically,the first explosion of a nuclear bomb was tested under the code name," The Gadget," by a team of scientists at Los Alamos under their 相似文献
925.
926.
A survey of public interest group leaders suggests some reasons why few third parties have chosen to advertise in recent elections. It indicates that public interest groups abstain from election advertising not because of the strictures of the Canada Elections Act but for other reasons, notably cost and fear of losing charitable status or of jeopardizing their access to and influence with officials. While the significance of these findings is limited by the scale of the survey, the results do raise tantalizing questions that warrant further research. 相似文献
927.
A key form of student‐level accountability is the requirement for students to pass high school exit exams (HSEEs) in order to receive a diploma. In this paper, we examine the impact of HSEEs on dropout during a period when these exams became more common and rigorous. Further, we study whether offering alternate pathways to graduation for students who cannot pass HSEEs moderates any dropout effects. Using a district‐grade‐level panel assembled from the Common Core of Data, we exploit the fact that new exit exam policies first affect a particular graduating class, so we can isolate the impact of exposure to HSEEs for students in one grade in a district separate from other unaffected grades in the same district. We estimate dropout effects by grade for all students, and by race, sex, and urbanicity. We find that HSEEs increase dropout rates for students in the 12th grade, with especially large effects for African‐American students. Dropout effects are uniformly larger in states that do not provide alternate pathways to receive a diploma or alternative credentials for students that cannot pass exit exams. We estimate that 1.25 percent of 12th graders in these states do not graduate with their high school class, likely due to having a diploma withheld because of inability to pass the requisite HSEE. © 2013 by the Association for Public Policy Analysis and Management. 相似文献
928.
The adage that “it is always easier to fight the last war” is one that readily can be applied to the United States and its armed forces for not predicting the scale and type of operations encountered in the occupations of Iraq and Afghanistan. This article argues that the lack of preparation in the post-invasion phases arose from an institutional attachment to a preferred paradigm of warfare, as exemplified by the Persian Gulf War of 1991. This paradigm, though, has been substantially resurrected and re-configured to suit the fighting preferences of the American armed forces in its protracted encounters in Iraq and Afghanistan. Far from re-orienting its organization and mindset to meet the challenges of so-called counterinsurgency campaigns, as much current advocacy maintains, the military has reverted to the form of warfare it knows best. 相似文献
929.
In this article we incorporate notions of the fairness of sanctionsinto the standard model of public enforcement. When both theprobability and magnitude of sanctions may be varied, the usualsolution involves a very high sanction and a relatively lowprobability of enforcement if individuals are risk neutral.When the issue of fairness is added to the analysis, the optimalsanction generally is not extremely high because such a sanctionwould be seen as unfair. The optimal probability of imposingsanctions may be higher than in the usual case (to offset thelower sanction) or lower than in the usual case (because thelower sanction reduces the effectiveness of enforcement). 相似文献
930.
Stephen A. Schuker 《Diplomacy & Statecraft》2014,25(4):579-591
The second part of this article shows that John Maynard Keynes worked closely with the German Finance and Foreign ministries as a supposed neutral expert in October 1922. He supported passive resistance to the French in the Ruhr without regard to its effects on the currency, secretly collaborated in writing the German reparations note of June 1923, and then praised his own work in a weekly that he controlled. Keynes opposed the 1929 Young Plan that re-scheduled the German debt and declined to accept modern thinking on overcoming the transfer problem. 相似文献