首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   10754篇
  免费   603篇
各国政治   428篇
工人农民   379篇
世界政治   858篇
外交国际关系   326篇
法律   7194篇
中国共产党   1篇
中国政治   56篇
政治理论   2075篇
综合类   40篇
  2021年   65篇
  2020年   209篇
  2019年   252篇
  2018年   250篇
  2017年   313篇
  2016年   317篇
  2015年   255篇
  2014年   284篇
  2013年   1058篇
  2012年   242篇
  2011年   313篇
  2010年   296篇
  2009年   303篇
  2008年   297篇
  2007年   269篇
  2006年   281篇
  2005年   252篇
  2004年   254篇
  2003年   236篇
  2002年   245篇
  2001年   469篇
  2000年   421篇
  1999年   293篇
  1998年   184篇
  1997年   150篇
  1996年   123篇
  1995年   119篇
  1994年   144篇
  1993年   132篇
  1992年   196篇
  1991年   218篇
  1990年   203篇
  1989年   212篇
  1988年   205篇
  1987年   194篇
  1986年   233篇
  1985年   206篇
  1984年   162篇
  1983年   170篇
  1982年   115篇
  1981年   127篇
  1980年   90篇
  1979年   132篇
  1978年   78篇
  1977年   73篇
  1976年   69篇
  1974年   73篇
  1973年   66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 109 毫秒
991.
992.
The sciatic notch/acetabular index and its rule of thumb application was tested on two European skeletal series of documented sex. The results showed poor consistency between documented and estimated sex. Of the two variables comprising the index, it appeared that sciatic notch width was a particularly poor discriminator of sex. It is suggested that this may be due to differences in the relationship between sciatic notch form and body size in different ethnic groups.  相似文献   
993.
External beam proton-induced X-ray emission (PIXE) analysis has been used to verify the presence of lead in the finger bone of a murder victim. The deceased, who had been buried several years, was known to have suffered a bullet wound to his right hand several years before death. X-ray radiographs of the right second proximal phalanx revealed the possible presence of metal fragments below the surface of the bone. To verify the presence of lead in a nondestructive manner, the bone was scanned with a 1.5-MeV proton beam. PIXE analysis showed that lead was present only in the vicinity of the fragments previously detected in the radiographs. A study of gunshot residue in bone shows that the distribution of lead around the bullet hole is independent of the firing distance for distances greater than 0.6 m.  相似文献   
994.
995.
The interpretation of bloodstain patterns at crime scenes has received increased attention in recent years. Important to an understanding of this is knowledge of the fundamentals of blood droplet formation and impact dynamics. A review of the literature reveals that a considerable amount of work has been done with aqueous drop dynamics. Workers in the forensic science area seem to have been unaware of this. In addition, some of the most important and comprehensive early work with blood droplet dynamics seems to have been forgotten. It is not cited in more recent publications dealing with bloodstain pattern interpretation. This literature is reviewed and discussed as well. The present study presents results of experiments with blood droplet dynamics and high-speed photographs of blood droplet impacts on stationary target surfaces. Some longstanding misconceptions of importance to forensic scientists engaged in crime scene reconstruction are discussed.  相似文献   
996.
The patients at a state maximum security forensic facility were interviewed by a psychiatrist and their files reviewed. Only 43 of the 203 patients were judged to be suitable for the facility. Nearly 60% of the pretrial defendants were judged to be capable of proceeding to trial. Of the patients, 18% were judged to be malingering or avoiding trial or prison. The implications of these findings are discussed.  相似文献   
997.
Police leadership is increasingly dependent on community oriented policing (COPS) federal grants because of diminishing financial resources. This paper demonstrates the importance of excellent police grantsmanship skills while simultaneously providing theoretical and concrete steps for achieving a successful grant package. Furthermore, a case study example is presented where COPS grants and federal funding assisted in the acquisition of community-oriented and problem-solving strategic objectives.  相似文献   
998.
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   
999.
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   
1000.
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   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号