全文获取类型
收费全文 | 7474篇 |
免费 | 175篇 |
专业分类
各国政治 | 406篇 |
工人农民 | 212篇 |
世界政治 | 465篇 |
外交国际关系 | 285篇 |
法律 | 4712篇 |
中国共产党 | 1篇 |
中国政治 | 20篇 |
政治理论 | 1452篇 |
综合类 | 96篇 |
出版年
2020年 | 64篇 |
2019年 | 85篇 |
2018年 | 122篇 |
2017年 | 136篇 |
2016年 | 156篇 |
2015年 | 115篇 |
2014年 | 137篇 |
2013年 | 821篇 |
2012年 | 205篇 |
2011年 | 201篇 |
2010年 | 158篇 |
2009年 | 172篇 |
2008年 | 201篇 |
2007年 | 183篇 |
2006年 | 191篇 |
2005年 | 150篇 |
2004年 | 155篇 |
2003年 | 160篇 |
2002年 | 171篇 |
2001年 | 309篇 |
2000年 | 281篇 |
1999年 | 226篇 |
1998年 | 82篇 |
1997年 | 103篇 |
1996年 | 82篇 |
1995年 | 85篇 |
1994年 | 94篇 |
1993年 | 82篇 |
1992年 | 157篇 |
1991年 | 176篇 |
1990年 | 155篇 |
1989年 | 173篇 |
1988年 | 150篇 |
1987年 | 142篇 |
1986年 | 164篇 |
1985年 | 130篇 |
1984年 | 124篇 |
1983年 | 129篇 |
1982年 | 81篇 |
1981年 | 76篇 |
1980年 | 57篇 |
1979年 | 111篇 |
1978年 | 64篇 |
1977年 | 63篇 |
1976年 | 58篇 |
1975年 | 67篇 |
1974年 | 82篇 |
1973年 | 76篇 |
1972年 | 68篇 |
1971年 | 60篇 |
排序方式: 共有7649条查询结果,搜索用时 37 毫秒
991.
992.
993.
The autopsy of a woman aged 85 years who was found dead sitting in her kitchen bent over the kitchen-table revealed a fatal carbon monoxide poisoning. Subsequent inquiries excluded the chimney flue and above all the gas-fired water heater from being the CO-generator. Operating experiments upon the gas stove including the ultimately used pot and the Hot Plate likewise found showed a CO-content of 100 ppm in the room-air after half an hour, there upon an over-proportional ascent of the CO-concentration. This CO-production was brought about by the considerable deformation of the Hot Plate, which has obviously been used for years. The lack of an adequate warning in the directions for use of such products is remarked critically. 相似文献
994.
In three cases a phenomenon is reported, seen on the skin of bodies found dead after a longer time of lying in bathtubs filled with water. The sign was parallel to the surface of the water and showed a breadth up to about 1 cm. Contrary to the surrounding skin, the mark was characterized by paleness and clearly les distinct formation of postmortem alterations as put-refaction. Searching for an explanation, temperature measurements were performed in model. The results showed the marginal paleness of the skin to be a thermal phase transition phenomenon. This mark has a forensic message too: it demonstrates a longer remaining of the corpse in the corresponding position, is a statement concerning the high of the water level, and allows a reconstruction of the original situation after manipulation, but is no sign of vital reaction. 相似文献
995.
The objective of this work was to study the postmortem redistribution of blood volumes and its influence of the distribution of substances of different molecular weight (194.2 and 150,000 Da). Lipiodol Ultrafluide, Omnitrast, or a radioisotopic mixture of aminohippuric acid and human IgG were injected into the left ventricle of a total of 20 rabbits divided into three groups. Our results demonstrate the importance of related factors, including left ventricular postmortem contraction, the arterial vascular bed, diffusion processes connected to the physicochemical characteristics of the substances, and the anatomical distribution of the vessels. Postmortem diffusion of aminohippuric acid to the urine was observed. 相似文献
996.
Study on the effects of heat on blood and on the post-mortem estimation of carboxyhaemoglobin and methaemoglobin 总被引:1,自引:0,他引:1
Blood samples of different carboxyhaemoglobin (CoHb) content (0%, 50%, 100%) were analysed, after short exposure to heat, for determination of the change of CoHb and methaemoglobin (MetHb) during the succeeding 14 days. Untreated blood showed an initial increase of MetHb after heating followed by a decrease during this period. There was no formation of CoHb in the untreated blood. When CoHb was already present in the blood the amount of MetHb was smaller in amount and was formed at a slower rate. In these samples the concentration of CoHb slowly decreased. 相似文献
997.
Ian Ward 《Law and Critique》1995,6(2):257-271
A review essay of P. Crowther,The Kantian Sublime: From Morality to Art (Oxford: Clarendon Press, 1989); P. Crowther,Critical Aesthetics and Postmodernism (Oxford: Clarendon Press, 1993); P. Crowther,Art and Embodiment: From Aesthetics to Self-Consciousness (Oxford: Clarendon Press, 1993). 相似文献
998.
999.
1000.