全文获取类型
收费全文 | 25112篇 |
免费 | 786篇 |
国内免费 | 5篇 |
专业分类
各国政治 | 1020篇 |
工人农民 | 1042篇 |
世界政治 | 1699篇 |
外交国际关系 | 808篇 |
法律 | 15868篇 |
中国共产党 | 6篇 |
中国政治 | 195篇 |
政治理论 | 5019篇 |
综合类 | 246篇 |
出版年
2020年 | 307篇 |
2019年 | 391篇 |
2018年 | 485篇 |
2017年 | 576篇 |
2016年 | 579篇 |
2015年 | 434篇 |
2014年 | 452篇 |
2013年 | 2288篇 |
2012年 | 625篇 |
2011年 | 698篇 |
2010年 | 561篇 |
2009年 | 627篇 |
2008年 | 704篇 |
2007年 | 760篇 |
2006年 | 709篇 |
2005年 | 672篇 |
2004年 | 645篇 |
2003年 | 675篇 |
2002年 | 607篇 |
2001年 | 984篇 |
2000年 | 828篇 |
1999年 | 704篇 |
1998年 | 378篇 |
1997年 | 271篇 |
1996年 | 321篇 |
1995年 | 292篇 |
1994年 | 317篇 |
1993年 | 314篇 |
1992年 | 513篇 |
1991年 | 555篇 |
1990年 | 538篇 |
1989年 | 486篇 |
1988年 | 510篇 |
1987年 | 457篇 |
1986年 | 520篇 |
1985年 | 501篇 |
1984年 | 421篇 |
1983年 | 405篇 |
1982年 | 310篇 |
1981年 | 302篇 |
1980年 | 231篇 |
1979年 | 301篇 |
1978年 | 205篇 |
1977年 | 199篇 |
1976年 | 182篇 |
1975年 | 184篇 |
1974年 | 213篇 |
1973年 | 176篇 |
1972年 | 166篇 |
1969年 | 149篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
971.
972.
973.
974.
975.
A legislator’s duty is to vote on legislation, yet legislators routinely miss votes. Existing studies of absenteeism have focused on the US Congress, producing useful but partial explanations. We provide added insight by examining absenteeism in American state legislatures. Our data include 2,916,471 individual votes cast by 4392 legislators from 64 legislative chambers. This rich, multistate dataset produces insights that build on and sometimes conflict with Congressional research. We use a multilevel logistic model with nested and crossed random effects to estimate the influence of variables at five different levels. In particular, we investigate whether state legislators miss unimportant votes or important votes. Contrary to what Congressional studies have found, we find that state legislators avoid participating in close or major votes, favoring reelection concerns over policy influence. We also find that state-to-state variations in legislative professionalism—in particular, the length of the session—affect absenteeism, with shorter sessions leading to higher absenteeism. 相似文献
976.
The Impact of Prenatal Exposure to Power Plant Emissions on Birth Weight: Evidence from a Pennsylvania Power Plant Located Upwind of New Jersey 下载免费PDF全文
Muzhe Yang Rhea A. Bhatta Shin‐Yi Chou Cheng‐I Hsieh 《Journal of policy analysis and management》2017,36(3):557-583
To examine the infant health impact of prenatal exposure to power plant emissions, we draw scientific evidence on the impacted region downwind of a large polluter, a coal‐fired power plant located on the border of two states and proven to be the sole contributor to the violation of air quality standards of the impacted region. Our results show that among all live singleton births that occurred during 1990 through 2006, those born to mothers living as far as 20 to 30 miles away downwind from the power plant (which is also an affluent region) during pregnancy are at greater risks of low birth weight (LBW) and very low birth weight (VLBW): the likelihoods of LBW and VLBW could increase approximately by 6.50 and 17.12 percent, respectively. In light of the continual efforts of The U.S. Environmental Protection Agency in reducing cross‐state air pollution caused by transboundary power plant emissions, our study is aimed at broadening the scope of cross‐border pollution impact analysis by taking into account adverse infant health effects of upwind polluters, which can impose disproportionate burdens of health risks on downwind states due to air pollutants transported by wind. 相似文献
977.
Conceptualising the policy engagement of interest groups: Involvement,access and prominence 下载免费PDF全文
While much progress has been made in empirically mapping and analysing a variety of interest group activities in the last decade, less attention has been devoted to conceptual work that clearly defines and distinguishes different forms of policy engagement. This article contributes to this endeavour by developing a theoretical framework that explicitly links currently available measures of the policy engagement of groups to the distinct concepts of group involvement, access and prominence. It argues that greater conceptual clarity will lead to better accumulation of knowledge in the sub‐field and a better understanding of the role of interest groups in political systems. 相似文献
978.
979.
Kevin A. Park 《Housing Policy Debate》2017,27(3):449-466
The Economic Stimulus Act of 2008 dramatically but temporarily increased the mortgage loan amount eligible for insurance through the Federal Housing Administration (FHA). We use the implementation and expiration of these loan limits as a source of exogenous variation in the availability of FHA insurance to measure the impact on the overall mortgage market and conventional lending. We find that the introduction of higher loan limits increased the number of loan originations, but that the expiration of those loan limits roughly 6 years later did not significantly decrease affected loan originations. The substitution between loan products and small net impact on the overall mortgage market when the ESA loan limits expired may be explained by the return of a stronger conventional lending industry than existed during the housing crisis. 相似文献
980.