全文获取类型
收费全文 | 20205篇 |
免费 | 625篇 |
国内免费 | 5篇 |
专业分类
各国政治 | 791篇 |
工人农民 | 880篇 |
世界政治 | 1359篇 |
外交国际关系 | 701篇 |
法律 | 13006篇 |
中国共产党 | 6篇 |
中国政治 | 174篇 |
政治理论 | 3729篇 |
综合类 | 189篇 |
出版年
2020年 | 264篇 |
2019年 | 332篇 |
2018年 | 420篇 |
2017年 | 473篇 |
2016年 | 492篇 |
2015年 | 342篇 |
2014年 | 372篇 |
2013年 | 1835篇 |
2012年 | 532篇 |
2011年 | 579篇 |
2010年 | 469篇 |
2009年 | 512篇 |
2008年 | 581篇 |
2007年 | 627篇 |
2006年 | 614篇 |
2005年 | 535篇 |
2004年 | 537篇 |
2003年 | 569篇 |
2002年 | 486篇 |
2001年 | 811篇 |
2000年 | 703篇 |
1999年 | 588篇 |
1998年 | 294篇 |
1997年 | 221篇 |
1996年 | 250篇 |
1995年 | 216篇 |
1994年 | 251篇 |
1993年 | 237篇 |
1992年 | 407篇 |
1991年 | 435篇 |
1990年 | 447篇 |
1989年 | 382篇 |
1988年 | 433篇 |
1987年 | 380篇 |
1986年 | 406篇 |
1985年 | 365篇 |
1984年 | 293篇 |
1983年 | 283篇 |
1982年 | 221篇 |
1981年 | 233篇 |
1980年 | 166篇 |
1979年 | 217篇 |
1978年 | 155篇 |
1977年 | 125篇 |
1976年 | 125篇 |
1975年 | 149篇 |
1974年 | 166篇 |
1973年 | 126篇 |
1972年 | 118篇 |
1970年 | 115篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
831.
The inventory of parent and peer attachment: Individual differences and their relationship to psychological well-being in adolescence 总被引:22,自引:14,他引:22
The results of two studies are reported. Study I involved the development of the Inventory of Parent and Peer Attachment (IPPA), a self-report instrument for use with adolescents. Subject were 179 college students aged 16–20 years. Item content of the instrument was suggested by attachment theory's formulations concerning the nature of feelings toward attachment figures. In Study II, the convergent validity of the IPPA was examined. Also, a hierarchial regression model was employed to investigate the association between quality of attachment and self-esteem, life-satisfaction, and affective status. Respondents were 86 adolescents from the Study I sample. As hypothesized, perceived quality of both parent and peer attachments was significantly related to psychological well-being. Results of the development of a theoretically focused, exploratory classification scheme indicated that adolescents classified as highly securely attached reported greater satisfaction with themselves, a higher likelihood of seeking social support, and less symptomatic response to stressful life events.She received her Ph.D. in Psychology at the University of Washington. Her research interests include the study of attachment, stress and coping styles in adolescence.He received his Ph.D. from the University of Virginia. His research interests include attachment relationships across the life span and their influence on personality, and the development of deaf children. 相似文献
832.
Carol A. Cassel 《Political Behavior》1987,9(3):246-256
The nonpartisan municipal ballot is one of several turn-of-the-century reforms intended to weaken political parties. Through its effects on individuals' political contexts and voting experiences, it might have contributed to the twentieth-century decline in public support for political parties. This paper tests this hypothesis with items available in the 1980 CPS presidential election survey augmented with a ballot form variable. There are no significant differences in measures of party support among residents of partisan and nonpartisan communities, and thus no measurable evidence that nonpartisan elections discouraged the public from supporting political parties.This is a revised version of a paper delivered at the XIII World Congress of the International Political Science Association, Paris, July 1985. 相似文献
833.
A. S. M. Abdul Matin 《Policy Sciences》1987,20(1):99-103
In an attempt to delay hatching without affecting their viability, the eggs ofLatheticus oryzae W. were subjected to cold treatment at 5° for varying periods and at different stages of their development. A small dose
of 0.5 krad of gamma radiation was also given at each of those temperature treatments. Most of the eggs hatched at 30° following
low-temperature exposures of 1 and 2 days. There was a significant decrease in hatch as the exposure period increased further
(P<0.05). An egg exposure to 5° also led to an increase in egg period and the increase was nearly equal to the period of cold
exposure. Radiation did not alter the situation.
Zusammenfassung Kühllagerung ist eine der gebr?uchlichsten Methoden für die Aufbewahrung von Insekteneiern. Um die optimalen Bedingungen für eine Vorratshaltung zu bestimmen, wurden 0–1 d alte Eier vonL. oryzae Temperaturen von 5° w?hrend 1–7 d ausgesetzt, nachdem sie verschieden lange bei 30° gehalten waren. Eine kleine Dosis von 0.5 krad Gammabestrahlung wurde bei jeder Temperaturbehandlung ebenfalls gegeben. Alle Eiproben wurden nach den verschiedenen K?ltebehandlungen in 30° zurückgebracht und die Wirkung auf Schlüpfprozentsatz und Eidauer bestimmt. Die Eidauer nahm zu, wenn die Eier bei 5° gehalten wurden, was anzeigt, da? die Embryogenese bei 5° unterdrückt wurde. Die Lebensf?higkeit der Eier wurde nicht beeintr?chtigt bei einer 5°-Einwirkungsdauer von 2 d, nahm aber bei weiterer Verl?ngerung der Expositionsdauer ab. Nur etwa 37% der Eier schlüpften (44,1% der Kontrolleier) nach 7-t?giger K?ltebehandlung. Bestrahlung beeinflu?te weder das Schlüpfen noch die Entwicklungsdauer.相似文献
834.
Robert A. Dahl 《Scandinavian political studies》1987,10(3):195-206
I want to sketch the general shape of several new structures that would in my view provide stronger support for democracy than is provided by any existing society. I call these sketches for a democratic Utopia not because I would expect these structures to inaugurate a perfect democracy, whatever that might be, nor because they are beyond human reach. On the contrary the institutions I want to suggest are well within human reach. I call them Utopian only because I am not able to point with confidence to the historical forces that are likely to bring them about.
The structures I have in mind are designed to strengthen freedom and equality among citizens of democratic orders. 相似文献
The structures I have in mind are designed to strengthen freedom and equality among citizens of democratic orders. 相似文献
835.
836.
837.
Rachel A. Vannatta 《Journal of youth and adolescence》1996,25(2):149-160
This study examined gender differences in self-reported suicidal behavior in relation to the risk factors of tobacco use, alcohol use, drug use, school misconduct, academic difficulties, home environment, sexual activity, and violence among seventh-through twelfth grade students (N=3461)in a northern Midwest school district. Data were gathered from the Survey Instrument of Attitude/Behavior administered in the school district during the spring of 1993. The dependent variables were suicidal activity and suicidal tendency. Stepwise forward regression ordered the independent factors in predicting suicidal activity and suicidal tendency for the male and female samples. The comparison of regression results revealed the following: (1) the independent factors accounted for more variance in male suicidal activity and tendency than in female suicidal activity and tendency; (2) as the level of suicidality increased, so did the frequency of violent behaviors among both genders; (3) leading predictors for suicidal activity were similar between gender; and (4) gender differences were displayed in predictors of suicidal tendency.Major interests include risk taking behaviors, youth suicide, and educator use of research. 相似文献
838.
839.
David A. Bositis 《Political Behavior》1988,10(4):333-348
This paper assesses the participant method as a research design strategy and offers some observations on the utility of such an approach to research. In particular, the method is examined for its utility in theory testing and for providing a more substantial understanding of roles in political behavior. A typology of roles germane to the participant observation process is presented. The use of participant observation in political science is examined, and finally, some illustrations of the participant method are presented and analyzed. 相似文献
840.