全文获取类型
收费全文 | 7250篇 |
免费 | 180篇 |
专业分类
各国政治 | 434篇 |
工人农民 | 319篇 |
世界政治 | 452篇 |
外交国际关系 | 289篇 |
法律 | 4447篇 |
中国政治 | 45篇 |
政治理论 | 1393篇 |
综合类 | 51篇 |
出版年
2020年 | 75篇 |
2019年 | 91篇 |
2018年 | 120篇 |
2017年 | 150篇 |
2016年 | 158篇 |
2015年 | 108篇 |
2014年 | 140篇 |
2013年 | 793篇 |
2012年 | 145篇 |
2011年 | 161篇 |
2010年 | 156篇 |
2009年 | 147篇 |
2008年 | 177篇 |
2007年 | 187篇 |
2006年 | 192篇 |
2005年 | 154篇 |
2004年 | 145篇 |
2003年 | 167篇 |
2002年 | 139篇 |
2001年 | 278篇 |
2000年 | 234篇 |
1999年 | 224篇 |
1998年 | 97篇 |
1997年 | 79篇 |
1996年 | 71篇 |
1995年 | 64篇 |
1994年 | 75篇 |
1993年 | 69篇 |
1992年 | 122篇 |
1991年 | 159篇 |
1990年 | 155篇 |
1989年 | 142篇 |
1988年 | 149篇 |
1987年 | 168篇 |
1986年 | 159篇 |
1985年 | 148篇 |
1984年 | 131篇 |
1983年 | 120篇 |
1982年 | 84篇 |
1981年 | 92篇 |
1980年 | 69篇 |
1979年 | 126篇 |
1978年 | 86篇 |
1977年 | 72篇 |
1976年 | 56篇 |
1975年 | 81篇 |
1974年 | 86篇 |
1973年 | 82篇 |
1972年 | 56篇 |
1971年 | 57篇 |
排序方式: 共有7430条查询结果,搜索用时 31 毫秒
51.
Deoxyribonucleic acid (DNA) typing of ribosomal ribonucleic acid (rRNA) genes was performed with a polymerase chain reaction (PCR) assay for species identification. A variable region of the 28S ribosomal RNA gene was amplified with primers complementary to flanking sequences phylogenetically well conserved. The products of twelve animal DNAs (human, Japanese monkey, dog, cattle, pig, cat, rabbit, mouse, rat, chicken, frog, and fish) were separated by polyacrylamide gel electrophoresis, each revealing a few bands ranging from 150 to 100 base pairs. The band patterns obtained from each DNA sample differed in number and size, which indicates the applicability of the method to species identification. Samples containing either as little as 1 pg of DNA or degraded DNA of 0.2 to 0.5 kb in length were able to give detectable bands. Postmortem human tissue DNAs were tested as an example. They showed a pattern identical to the human control one, which was distinct from those of the other animals examined. 相似文献
52.
Policy analysis for the Congress is a timely subject. Several policy initiatives have emerged recently from the “first branch.” Others have demonstrated an independent capacity for analysis that is impressive by historical standards. This article introduces a practitioner symposium of three related works on policy analysis for Congress, with appropriate commentary by a distinguished veteran. It argues that because timing is crucial in the congressional policy process, anticipation and advance preparation are central to the effective use of analysis. The other articles illustrate the stages of advance preparation—of the policy analyst, the congressional environment, and the Member for voting—in the form of case studies. 相似文献
53.
Ministerialrat a. D. Prof. Dr. Ernst-Rainer Hönes 《Natur und Recht》2005,27(5):279-285
Der Begriff der Landeskultur umfasst alle Maßnahmen zur Verbesserung der land- und forstwirtschaftlichen Nutzung des Bodens einschließlich der Erhaltung der Kulturlandschaft. Landeskultur ist somit alles Planen und Handeln mit dem Ziel, die Umwelt als gegebenes Naturraumpotential, insbesondere Wasser, Boden, Luft und die dazugehörigen Natur-, Kultur- und Sachgüter optimal zu erhalten, gestalten und rationell zu nutzen sowie dieses Potential mit bestmöglicher Qualität als natürliche und kulturelle Lebensgrundlage für die Allgemeinheit nachhaltig zu sichern. Landeskultur dient somit auch der Belebung und Werterhöhung der gebauten und gepflanzten Umwelt. Dies schließt auch und gerade die kulturelle Seite einschließlich Kulturlandschaften mit ein. Dabei ist es bis zur Überprüfung durch das BVerfG noch hinnehmbar, dass der Begriff „Landeskultur“ in Art. 89 Abs. 3 GG wegen der Mischkompetenz von Bund und Land vom BVerwG enger ausgelegt wird als in anderen Rechtsvorschriften. 相似文献
54.
55.
56.
This article examines the question of trust in Bosnia and Herzegovina with a special focus on the role of ethnicity. We find generalised trust to be low and declining in Bosnia and Herzegovina. Moreover, generalised trust is negatively affected by the degree of ethnic heterogeneity in the region. However, a further examination of trust reveals a more complex relationship between ethnicity and trust: people tend to show low levels of trust in all other people irrespective of their ethnic belongings. We argue that ethnic distribution might capture some other regional specific characteristics that also affect the level of trust. 相似文献
57.
58.
59.
60.
Routine crime in exceptional times: The impact of the 2002 Winter Olympics on citizen demand for police services 总被引:2,自引:0,他引:2
Despite their rich theoretical and practical importance, criminologists have paid scant attention to the patterns of crime and the responses to crime during exceptional events. Throughout the world large-scale political, social, economic, cultural, and sporting events have become commonplace. Natural disasters such as blackouts, hurricanes, tornadoes, and tsunamis present similar opportunities. Such events often tax the capacities of jurisdictions to provide safety and security in response to the exceptional event, as well as to meet the “routine” public safety needs. This article examines “routine” crime as measured by calls for police service, official crime reports, and police arrests in Salt Lake City before, during, and after the 2002 Olympic Games. The analyses suggest that while a rather benign demographic among attendees and the presence of large numbers of social control agents might have been expected to decrease calls for police service for minor crime, it actually increased in Salt Lake during this period. The implications of these findings are considered for theories of routine activities, as well as systems capacity. 相似文献