全文获取类型
收费全文 | 10481篇 |
免费 | 547篇 |
专业分类
各国政治 | 416篇 |
工人农民 | 355篇 |
世界政治 | 817篇 |
外交国际关系 | 302篇 |
法律 | 7080篇 |
中国共产党 | 1篇 |
中国政治 | 54篇 |
政治理论 | 1963篇 |
综合类 | 40篇 |
出版年
2021年 | 60篇 |
2020年 | 192篇 |
2019年 | 234篇 |
2018年 | 233篇 |
2017年 | 291篇 |
2016年 | 295篇 |
2015年 | 245篇 |
2014年 | 269篇 |
2013年 | 985篇 |
2012年 | 234篇 |
2011年 | 302篇 |
2010年 | 286篇 |
2009年 | 299篇 |
2008年 | 287篇 |
2007年 | 257篇 |
2006年 | 274篇 |
2005年 | 248篇 |
2004年 | 250篇 |
2003年 | 233篇 |
2002年 | 237篇 |
2001年 | 462篇 |
2000年 | 419篇 |
1999年 | 293篇 |
1998年 | 182篇 |
1997年 | 147篇 |
1996年 | 123篇 |
1995年 | 117篇 |
1994年 | 144篇 |
1993年 | 131篇 |
1992年 | 198篇 |
1991年 | 217篇 |
1990年 | 203篇 |
1989年 | 212篇 |
1988年 | 205篇 |
1987年 | 190篇 |
1986年 | 232篇 |
1985年 | 207篇 |
1984年 | 160篇 |
1983年 | 170篇 |
1982年 | 112篇 |
1981年 | 120篇 |
1980年 | 85篇 |
1979年 | 131篇 |
1978年 | 74篇 |
1977年 | 73篇 |
1976年 | 69篇 |
1974年 | 73篇 |
1973年 | 67篇 |
1972年 | 66篇 |
1970年 | 46篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
881.
Fluidity of cadaveric blood after sudden death: Part III. Acid-base balance and fibrinolysis 总被引:1,自引:0,他引:1
S Takeichi I Tokunaga K Hayakumo M Maeiwa 《The American journal of forensic medicine and pathology》1986,7(1):35-38
In rats, fibrinolytic activity and acidosis increased rapidly after death. Postmortem fibrinolysis and the pH, base excess (BE), and [HCO3-] levels were affected by the method of sacrifice: the lower the pH, BE, and [HCO3-] levels, the higher the fibrinolytic activity. Conversely, in experiments using the vascular perfusion technique, low pH, BE, and [HCO3-] levels of the perfusate induced abundant release of plasminogen activator from the vascular wall. 相似文献
882.
The purpose of this paper is to see how economic factors determine prices in the previously communist countries undergoing privatization. This does not concern the auctions of big state enterprises where the prices are found to be rigged. In this paper we estimate hedonic price functions based on a unique data set on auction prices of apartments in Moscow. We collected the data ourselves by attending the auctions and gathered data on the characteristics. We estimated the hedonic equations using a disequilibrium approach because no equilibrium prices were observed for large number of apartments that were withdrawn from the auction. We found that, as the privatization of residential housing was carried out, the hedonic price equations fit the data remarkably well. 相似文献
883.
Mild hypothermia, induced by experimental immersion of ten subjects in cold water, distorted the decay curve of breath ethanol of intoxicated subjects by as much as 22% while not altering overall ethanol clearance rate. The results provide in vivo verification of the in vitro temperature correction factor of 6.8% X degrees C-1, and support previous recommendations that temperature monitoring be included in procedures for breath-ethanol testing. We recommend that mouth temperature be obtained before breath sampling to screen for abnormal body temperature and to allow for potential use of a temperature correction factor. This modification to existing analytical procedures would help to optimize the reliability of breath-ethanol analysis in predicting blood-ethanol concentration. 相似文献
884.
The increasing number of discussions on the influence of toxic environmental factors, including SIDS, prompted systematic postmortem chemical-toxicological investigations to be carried out on 54 SIDS cases and 2 control cases of the same age group. Tissue levels of arsenic, lead, cadmium, mercury, and pentachlorphenol, as well as other organic noxious agents, were measured in several organs. In addition, the COHb concentrations were determined. In spite of the widely scattered values, the extreme levels measured and the arithmetic means and median averages of As, Pb, Cd, Hg, PCP, and COHb had no more range in concentrations than can be expected for toxic effects - according to present knowledge anyway. It was observed that infants from an urban environment showed no greater concentration of noxious agents than did infants from rural regions. There were also no differences between SIDS cases and the controls, nor was there a correlation between infections of the respiratory system that are often morphologically detected - including laryngitis - and higher concentrations of these agents in the organs of SIDS cases. 相似文献
885.
John S. Carroll 《Law and human behavior》1987,11(4):319-335
The effectiveness of law as an instrument of social control depends on the assumptions lawmakers and implementers have about human behavior. The tax laws offer a good example of the difficulties in trying to anticipate what people will do in response to various legal requirements. This paper proposes a new approach to understanding tax compliance drawn from behavioral decision theory. The paper discusses the issue of rationality, explores the strategies people use to make taxpaying decisions, focuses on the distinction between norm-processing and outcome-processing strategies, and presents some implications of this approach for research and for legal policy making. 相似文献
886.
887.
C I Swalwell S K Reddy V J Rao 《The American journal of forensic medicine and pathology》1991,12(4):306-312
Coronary artery vasculitis is a well-recognized complication of polyarteritis nodosa and is occasionally seen in other forms of systemic vasculitis. However, involvement of the major epicardial coronary arteries leading to myocardial infarction and death is uncommon. Isolated coronary arteritis is even more rare. We report three cases of sudden death due to myocardial ischemia associated with arteritis of the major coronary arteries. All three decedents were previously healthy young to middle-aged men who had died suddenly after complaints of chest pain and shortness of breath. The autopsy findings and differential diagnoses are presented. Such cases are of particular interest to the medical examiner because of the sudden, unexpected nature of the deaths. An approach to the correct diagnosis is discussed. 相似文献
888.
889.
Indian Peafowl (Pavo cristatus) tail covert feathers were studied to investigate the difference between shed and plucked feathers in the context of wildlife offence cases involving the killing of the Indian national bird for the purpose of plucking feathers. Plucked feathers were distinguished from shed feathers by examining their roots under low magnification of a stereoscopic microscope. A chemical test to show the presence of blood on the roots of plucked feathers was used to corroborate the plucked origin of feathers. 相似文献
890.