全文获取类型
收费全文 | 4151篇 |
免费 | 155篇 |
专业分类
各国政治 | 155篇 |
工人农民 | 128篇 |
世界政治 | 279篇 |
外交国际关系 | 154篇 |
法律 | 2802篇 |
中国政治 | 39篇 |
政治理论 | 734篇 |
综合类 | 15篇 |
出版年
2021年 | 32篇 |
2020年 | 58篇 |
2019年 | 58篇 |
2018年 | 96篇 |
2017年 | 124篇 |
2016年 | 101篇 |
2015年 | 76篇 |
2014年 | 91篇 |
2013年 | 322篇 |
2012年 | 97篇 |
2011年 | 115篇 |
2010年 | 89篇 |
2009年 | 96篇 |
2008年 | 119篇 |
2007年 | 93篇 |
2006年 | 111篇 |
2005年 | 96篇 |
2004年 | 107篇 |
2003年 | 102篇 |
2002年 | 101篇 |
2001年 | 196篇 |
2000年 | 136篇 |
1999年 | 111篇 |
1998年 | 43篇 |
1997年 | 50篇 |
1996年 | 40篇 |
1995年 | 50篇 |
1994年 | 52篇 |
1993年 | 58篇 |
1992年 | 83篇 |
1991年 | 92篇 |
1990年 | 82篇 |
1989年 | 67篇 |
1988年 | 87篇 |
1987年 | 87篇 |
1986年 | 102篇 |
1985年 | 114篇 |
1984年 | 88篇 |
1983年 | 85篇 |
1982年 | 42篇 |
1981年 | 43篇 |
1979年 | 37篇 |
1978年 | 35篇 |
1975年 | 34篇 |
1974年 | 46篇 |
1973年 | 29篇 |
1972年 | 29篇 |
1971年 | 31篇 |
1970年 | 30篇 |
1968年 | 33篇 |
排序方式: 共有4306条查询结果,搜索用时 0 毫秒
891.
N N Zhivoderov T M Il'ina D B Antipas L A Belova I A Sachkova 《Sudebno-meditsinskaia ekspertiza》1989,32(4):12-15
The results of experimental investigation on determination of stress-strain and resistant skin properties, its plastic elements (collagenous proteins, proteoglycans, glycoproteins) and steam permeability in lesion modelling are presented. 相似文献
892.
David N. Figlio 《Journal of policy analysis and management》1995,14(4):555-566
The imposition of a national 21-year minimum drinking age has sparked considerable controversy in recent years. Critics have contended that the perceived “successes” of the increased drinking age are actually due to underlying trends toward fewer alcohol-related crashes among teenagers, and would have occurred in the absence of an increased drinking age. I use monthly Wisconsin time-series data from 1976 to 1993 to estimate the effects of increased minimum drinking ages on alcohol-related crashes involving teenagers. I find that raising the drinking age has resulted in substantially lower alcohol-related crash rates involving teenagers. In addition, I find evidence that crashes increased in years in which Wisconsin's drinking age was lower than those of its neighbors, suggesting that “border hopping” resulted from interjurisdictional policy differences. 相似文献
893.
Previous experimental research has found that self-Serving biases are a major cause of negotiation impasses. In this study we show that a simple intervention can mitigate such biases and promote efficient settlement of disputes. 相似文献
894.
Experiments were carried out on 30 dogs to investigate the course of respiration during obstructive asphyxia. They were asphyxiated by occlusion of the exposed trachea. Intrathoracic pressure, blood pressure in the femoral artery, electrocardiogram and electroencephalogram readings were registered. In most cases, the respiration course during the dyspnea stage by occlusion of the trachea generally had an inspiratory character. In a few animals, when the trachea was occluded in the expiratory phase, there were a few positive expiratory respirations with moderate inspiratory movement and thereafter the respirations were inspiratory during the dyspnea stage. The terminal respirations, which occurred 1-2 min before the circulatory breakdown, were generally inspiratory, but in a few dogs they were expiratory. 相似文献
895.
896.
Comparative analysis and evaluation of all modern methods used for medicolegal diagnosis of poisoning with Amanita phalloides are presented. Imperfection of methods used for laboratory diagnosis of such poisonings requires extensive experimental control using the designed method of liquid chromatography for amanitine and phalloidine assay in the cadaveric organs and tissues. 相似文献
897.
898.
Mental retardation as it is frequently interrelated with a variety of organic brain dysfunctions may present unclear clinical pictures. This has particular relevance for the forensic practitioner who often needs to present his findings to the court in a clearly demarcated manner. This paper outlines the more commonly encountered entities in this area with consideration to forensic science implications. 相似文献
899.
900.
N.A. Fuller 《Forensic science international》1985,27(3):189-204
The Nanospec 10S microspectrophotometer has been used to produce reflectance spectra over the 380–900 nm range from coloured thin-layer chromatography spots. The method has been applied to extracted paint pigments and to dyes from other materials examined in forensic science. 相似文献