全文获取类型
收费全文 | 17963篇 |
免费 | 1314篇 |
专业分类
各国政治 | 631篇 |
工人农民 | 596篇 |
世界政治 | 1298篇 |
外交国际关系 | 490篇 |
法律 | 13064篇 |
中国共产党 | 1篇 |
中国政治 | 126篇 |
政治理论 | 2963篇 |
综合类 | 108篇 |
出版年
2020年 | 397篇 |
2019年 | 431篇 |
2018年 | 489篇 |
2017年 | 577篇 |
2016年 | 601篇 |
2015年 | 511篇 |
2014年 | 546篇 |
2013年 | 1764篇 |
2012年 | 421篇 |
2011年 | 522篇 |
2010年 | 649篇 |
2009年 | 607篇 |
2008年 | 438篇 |
2007年 | 444篇 |
2006年 | 541篇 |
2005年 | 401篇 |
2004年 | 386篇 |
2003年 | 409篇 |
2002年 | 354篇 |
2001年 | 705篇 |
2000年 | 595篇 |
1999年 | 486篇 |
1998年 | 223篇 |
1997年 | 193篇 |
1996年 | 174篇 |
1995年 | 193篇 |
1994年 | 206篇 |
1993年 | 172篇 |
1992年 | 340篇 |
1991年 | 357篇 |
1990年 | 336篇 |
1989年 | 371篇 |
1988年 | 327篇 |
1987年 | 312篇 |
1986年 | 320篇 |
1985年 | 346篇 |
1984年 | 317篇 |
1983年 | 310篇 |
1982年 | 231篇 |
1981年 | 210篇 |
1980年 | 186篇 |
1979年 | 235篇 |
1978年 | 162篇 |
1977年 | 141篇 |
1976年 | 119篇 |
1975年 | 112篇 |
1974年 | 131篇 |
1973年 | 120篇 |
1972年 | 93篇 |
1971年 | 103篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
111.
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
112.
K Lalu P J Karhunen P Rautiainen 《The American journal of forensic medicine and pathology》1992,13(3):196-198
A 6-month-old girl died suddenly without any previous symptoms of heart failure. Autopsy examination showed cardiomegaly (97 g) with a severely fibrotized myocardium. The left coronary artery was originating from the pulmonary artery. Histologically, the myocardium showed myocardial infarcts of different ages, as well as grossly thickened arterial branches due to increased flow in left-right shunt. We suggest that rare anomalies of the coronary arteries should be considered in the autopsies of suspected sudden infant death syndrome cases. 相似文献
113.
The impact of high temperatures (24 to 39 degrees C) and low to moderately high humidities (20 to 70%) on the applicability of TLC systems for drug identification was studied during a 6 month climatologic cycle in Burkina Faso (West Africa). In general, the Rf values as observed on the plates were found to be substantially affected as compared with values obtained at temperate climates. Some TLC systems were more affected than others and the largest deviations of up to 30 Rf units were at low humidities. Tropical conditions also had a negative effect on the reproducibility of Rf values. However, when an Rf-correction procedure was applied, using reference mixtures of known drugs on each plate, accuracy as well as reproducibility of the resulting Rfc values were drastically improved and data thus corrected were found to be compatible with existing TLC data bases developed under moderate climatological conditions. The impact of high to extremely high humidities (70 to 100%) remains to be investigated. 相似文献
114.
Washington University v. Catalona revolves around ownership of tissue samples provided by patients for research purposes, raising significant ethical and legal questions concerning patient rights, current human research practices, and the treatment of samples as capital resources by the research institution. 相似文献
115.
Here we consider two ways that nanomedicine might be disruptive. First, low-end disruptions that are intrinsically unpredictable but limited in scope, and second, high end disruptions that involve broader societal issues but can be anticipated, allowing opportunity for ethical reflection. 相似文献
116.
This synoptic article focuses on the origin and functioning of the Office of the Family Advocate as the protector of the interests of minor children in divorce cases. Attention is paid to the general contemporary trend to specialise in judicial decision-making that developed out of an increasing need for expertise in the administration of justice. A number of arguments for and against judicial specialisation are addressed. The origin of the Office of the Family Advocate within the South African judicial system is discussed and a brief exposition of the history of divorce legislation in South Africa is given. This is followed by attention to the functioning of the Office of the Family Advocate with reference to the process followed in investigations of this office and points of criticism against the system are highlighted. The article closes with an indication of the need for research in this regard and possible focus points for future research are identified. 相似文献
117.
118.
We consider the problem of drawing inferences within a legal framework when a person is a suspect for two separate offences. Although we are primarily concerned with scientific evidence the issue inevitably arises as to how that evidence interacts with other, non-scientific evidence. We show that, in this particular context, the evidence can be conveniently classified into three categories that concern, respectively: the first crime only; the second crime only; and evidence that relates to similarities between the two crimes. Two case examples are considered and we consider DNA, fibres and eyewitness evidence. These are viewed from the perspective of a prosecutor who has to decide whether or not to charge a suspect with one or both crimes. Graphical sensivity analyses are presented which have features that are not intuitively obvious. 相似文献
119.
The link between resource deprivation and urban violence has long been explored in criminological research. Studies, however, have largely ignored the potential for resource deprivation in particular communities to affect rates of violence in others. The relative inattention is notable because of the strong theoretical grounds to anticipate influences that extend both to geographically contiguous areas and to those that, though not contiguous, share similar social characteristics. We argue that such influences—what we term spatial and social proximity effects, respectively—constitute a central feature of community dynamics. To support this argument, we develop and test theoretically derived hypotheses about spatial and social proximity effects of resource deprivation on aggregated and disaggregated homicide counts. Our analyses indicate that local area resource deprivation contributes to violence in socially proximate communities, an effect that, in the case of instrumental homicides, is stronger when such communities are spatially proximate. We conclude by discussing the implications of our findings for theories focused on community‐level social processes and violence, and for policies aimed at reducing crime in disadvantaged areas. 相似文献
120.