首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   5420篇
  免费   229篇
各国政治   377篇
工人农民   189篇
世界政治   581篇
外交国际关系   418篇
法律   2370篇
中国政治   48篇
政治理论   1607篇
综合类   59篇
  2023年   39篇
  2022年   19篇
  2021年   41篇
  2020年   87篇
  2019年   114篇
  2018年   198篇
  2017年   197篇
  2016年   253篇
  2015年   141篇
  2014年   156篇
  2013年   874篇
  2012年   179篇
  2011年   176篇
  2010年   149篇
  2009年   154篇
  2008年   201篇
  2007年   239篇
  2006年   211篇
  2005年   189篇
  2004年   193篇
  2003年   161篇
  2002年   162篇
  2001年   106篇
  2000年   97篇
  1999年   106篇
  1998年   83篇
  1997年   88篇
  1996年   71篇
  1995年   63篇
  1994年   70篇
  1993年   77篇
  1992年   66篇
  1991年   62篇
  1990年   62篇
  1989年   52篇
  1988年   62篇
  1987年   40篇
  1986年   49篇
  1985年   38篇
  1984年   39篇
  1983年   30篇
  1982年   28篇
  1981年   31篇
  1980年   18篇
  1979年   19篇
  1978年   20篇
  1977年   16篇
  1976年   14篇
  1975年   14篇
  1974年   30篇
排序方式: 共有5649条查询结果,搜索用时 15 毫秒
251.
The present investigation attempted to ascertain longitudinally whether diffuseness about academic goals and plans would predict subsequent underachievement. Identity-status interviews were administered to 98 firstsemester college students. Their grade point averages (GPA) were obtained for their first six semesters in college. SAT and conceptual-level scores were used to generate predicted GPAs. Underachievement was operationally defined as a positive discrepancy between predicted-minus-observed GPA: underachievement=predicted observed GPA. Evidence for the hypothesized relationship between diffusion and academic underachievement was not found. To the contrary, Diffusions during their freshman year showed a tendency for relativeoverachievement (predicted observed GPA). The possibility of heterogeneity within Marcia's diffusion status was considered. Some diffuselike individuals may see their current lack of commitment and concern as a hiatus, whereas others may be truly unconcerned and myopic about their lives. A significant association between foreclosure and underachievement was found when the subjects were freshmen. This relationship was not replicated with an independent sample of 90 high school students. A post hoc interpretation focused on differences between transient and long-term Foreclosures and the role that the college environment may potentially play in instigating personal identity crises. The need for longitudinal tests on this account is underscored.  相似文献   
252.
The Case for Local Government. By G. Jones and J. Stewart eds. The Politics of Local Spending. By A. Midwinter . Edinburgh: Mainstream Publishing. Abolition or Reform? The GLC and the Metropolitan Counties. By N. Flynn , S. Leach and C. Vielba .  相似文献   
253.
254.
Science policy analysts have traditionally classified R&D laboratories as government, private, or university. The authors argue that this view is outmoded and provides little help in understanding the rapidly changing environment of R&D laboratories. They provide and test an alternative scheme designed to cope with “sector blurring” and the intermingling of market and political influences on R&D laboratories. The authors also discuss implications of their scheme for a variety of contemporary science policy issues.  相似文献   
255.
256.
257.
It is worth repeating that causality testing is a very complex task. The diversity of views on interpreting the definition of causality and on the methods for testing causality highlight this issue. In our study, we cite an excellent article which provides a detailed critique of various problems associated with causality tests (see Conway, et al., 1984). It would appear that Chowdhury's comment draws very strong conclusions and fails to consider some of the complex theoretical issues regarding causality tests as well as important data problems pertaining to state and local governments. Moreover, we find it somewhat curious that, given the strong similarities in our two studies, Chowdhury prefers to dwell on the mechanics of an alternative technique rather than concentrate on the fact that his alternative technique yields supporting results to our 1987 paper on the tax-spend hypothesis.The views expressed are those of the authors alone and do not necessarily represent those of the U.S. Department of Treasury.  相似文献   
258.
259.
260.
Using a new series of data on occupational fatalities compiled by the National Institute for Occupational Safety and Health, the authors reassess value-of-life calculations based on labor market tradeoffs between fatality risks and wages. The new data are less subject to the problems of measurement error that plague previously used measures of risk. They indicate higher risk levels than previously believed and a significantly different composition of risk levels within industries. The more comprehensive risk data yield value-of-life estimates of $5 million or more—at least twice as large as estimates obtained using the Bureau of Labor Statistics risk data employed in previous studies.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号