全文获取类型
收费全文 | 5598篇 |
免费 | 234篇 |
专业分类
各国政治 | 381篇 |
工人农民 | 202篇 |
世界政治 | 607篇 |
外交国际关系 | 424篇 |
法律 | 2480篇 |
中国政治 | 49篇 |
政治理论 | 1629篇 |
综合类 | 60篇 |
出版年
2023年 | 40篇 |
2022年 | 19篇 |
2021年 | 42篇 |
2020年 | 88篇 |
2019年 | 119篇 |
2018年 | 204篇 |
2017年 | 202篇 |
2016年 | 264篇 |
2015年 | 144篇 |
2014年 | 158篇 |
2013年 | 887篇 |
2012年 | 185篇 |
2011年 | 187篇 |
2010年 | 162篇 |
2009年 | 159篇 |
2008年 | 211篇 |
2007年 | 251篇 |
2006年 | 219篇 |
2005年 | 191篇 |
2004年 | 195篇 |
2003年 | 167篇 |
2002年 | 170篇 |
2001年 | 110篇 |
2000年 | 100篇 |
1999年 | 109篇 |
1998年 | 85篇 |
1997年 | 90篇 |
1996年 | 75篇 |
1995年 | 66篇 |
1994年 | 74篇 |
1993年 | 79篇 |
1992年 | 68篇 |
1991年 | 65篇 |
1990年 | 64篇 |
1989年 | 52篇 |
1988年 | 64篇 |
1987年 | 43篇 |
1986年 | 50篇 |
1985年 | 38篇 |
1984年 | 41篇 |
1983年 | 31篇 |
1982年 | 29篇 |
1981年 | 33篇 |
1980年 | 18篇 |
1979年 | 19篇 |
1978年 | 21篇 |
1977年 | 16篇 |
1976年 | 14篇 |
1975年 | 15篇 |
1974年 | 33篇 |
排序方式: 共有5832条查询结果,搜索用时 15 毫秒
271.
272.
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
273.
J. Richard Walsh 《East Asia》1988,7(2):20-40
He is the author ofChange, Continuity and Commitment: China’s Adaptive Foreign Policy (forthcoming, University Press of America). 相似文献
274.
This study examines the achievement of autonomy by a sample of 30 midly learning handicapped and 30 nonhandicapped adolescents. From participant observation over the course of a school year, a detailed account was obtained about the life of each subject, both in the home and among friends outside the home. Findings suggest that autonomy is achieved through a gradual process of negotiation during the high school years. The mildly handicapped adolescents generally lag behind their regular education counterparts in breaking away from the family. While almost three-fourths of the nonhandicapped sample had made significant gains toward increased freedom, less than half of the mildly handicapped sample had shed close supervision by parents. However, most of the handicapped adolescents were satisfied with the limited freedom they had. The data suggest that autonomy should be understood as relative to the needs and abilities of each individual. Not all adolescents develop at the same pace; not all feel the same desire to assert their independence from their parents when they reach a particular age.This research was supported by Grant HD23097 from the National Institute of Child Health and Human Development.Received his Ph.D. from the University of California, Irvine. Current interest is the adjustment problems of mildly learning handicapped adolescents.Received her Ed.D. from Columbia University. Current interest is social competence of mildly learning handicapped populations and family adjustment. 相似文献
275.
Michael Corbett 《Journal of youth and adolescence》1988,17(3):197-210
This paper examines changes that occurred in the political attitudes of Southern and Northern youth from the 1970s to the 1980s. National survey data from the National Opinion Research Center is used. Considering attitudinal changes of people under 30, it appears that trends toward greater political tolerance and greater support for racial and sexual equality will continue in the future. However, this study finds a reversal of the usual trend of greater political tolerance among young people. The United States is increasing in conservatism on the social issues. Aside from the social issues, younger people have not become more conservative with age. Important regional differences in attitude changes are indicated.Recieved Ph.D. from University of Iowa. Research interests include political tolerance and public opinion. 相似文献
276.
Douglas Cullinan Robert M. Schultz Michael H. Epstein Jerry F. Luebke 《Journal of youth and adolescence》1984,13(1):57-64
Adolescent girls aged 12 through 16 years, identified as either educable mentally retarded, behaviorally disordered, learning disabled, or nonhandicapped, were rated by their teachers on the Behavior Problem Checklist. Analysis of these ratings revealed significant differences for pupil category, Behavior Problem Checklist dimension, and category-by-dimension interaction. Behaviorally disordered students showed a greater degree of maladjustment than the retarded and nonhandicapped students on all four checklist dimensions, and exceeded the learning disabled on three dimensions (not Personality Problem). Implications for further research and special educational practices based on the present findings are discussed.Received Ed.D. from University of Virginia. Main interest is the handicapped adolescent.Received Ms.Ed. from Northern Illinois University. Main interest is emotionally disturbed children.Received Ed.D. from University of Virginia. Main interest is educational programming.Received Ms.Ed. from Northern Illinois University. Main interest is educational research. 相似文献
277.
278.
We show that temporal, spatial, and dyadic dependencies amongobservations complicate the estimation of covariance structuresin panel databases. Ignoring these dependencies results in covarianceestimates that are often too small and inferences that may bemore confident about empirical patterns than is justified bythe data. In this article, we detail the development of a nonparametricapproach, window subseries empirical variance estimators (WSEV),that can more fully capture the impact of these dependencieson the covariance structure. We illustrate this approach ina simulation as well as with a statistical model of internationalconflict similar to many applications in the international relationsliterature. 相似文献
279.
280.
The authors report on three autopsy cases in which the findings at the death scene gave rise to the suspect of non-natural, in two cases even violent causes of death. The medico-legal and criminalistic investigations led to surprising results: Death was due to acute intoxication with narcotics, supposed delirium tremens and a suicide attempt in the presence of bronchopneumonia. External force was ruled out in all three fatalities by cooperative work of police investigators and forensic medicine. 相似文献