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   7824篇
  免费   185篇
  国内免费   4篇
各国政治   295篇
工人农民   252篇
世界政治   498篇
外交国际关系   396篇
法律   4174篇
中国共产党   235篇
中国政治   462篇
政治理论   1172篇
综合类   529篇
  2022年   48篇
  2021年   71篇
  2020年   130篇
  2019年   114篇
  2018年   141篇
  2017年   136篇
  2016年   135篇
  2015年   104篇
  2014年   170篇
  2013年   661篇
  2012年   232篇
  2011年   292篇
  2010年   296篇
  2009年   337篇
  2008年   363篇
  2007年   380篇
  2006年   351篇
  2005年   337篇
  2004年   221篇
  2003年   185篇
  2002年   177篇
  2001年   389篇
  2000年   299篇
  1999年   206篇
  1998年   86篇
  1997年   85篇
  1996年   57篇
  1995年   55篇
  1994年   49篇
  1993年   43篇
  1992年   127篇
  1991年   143篇
  1990年   135篇
  1989年   131篇
  1988年   115篇
  1987年   126篇
  1986年   102篇
  1985年   95篇
  1984年   100篇
  1983年   83篇
  1982年   57篇
  1981年   73篇
  1980年   38篇
  1979年   76篇
  1978年   43篇
  1975年   37篇
  1974年   49篇
  1973年   54篇
  1972年   39篇
  1971年   34篇
排序方式: 共有8013条查询结果,搜索用时 15 毫秒
991.
992.
Blood cyanide concentration was determined in rabbits intoxicated orally or by inhalation. Experiments were carried out under urethane anaesthesia. In the inhalation experiments, rabbits inhaled a combustion product containing HCN via the tracheal cannula and in the oral studies animals were administered NaCN solution into the stomach. In addition to the carotid artery and jugular vein blood samples, postmortem samples were obtained from both sides of the heart and the descending vena cava. The arterial cyanide concentration in the inhalation group showed a close relationship with ventilation. After an initial rise, blood levels decreased a little, in some cases with transient apnea. At the last stage it again increased with gasping, reaching its maximal value. After ultimate apnea, the blood cyanide concentration declined. The blood cyanide values were higher in the oral group than in the inhalation group. The difference between the two groups became larger in the inferior order, the left heart blood--the right heart blood--blood in the descending vena cava. The left heart/right heart ratio of the inhalation group was significantly higher than that of the oral group (1.28+/- 0.28 vs. 0.95+/- 0.09). The coefficient of variation (c.v.) of the inhalation group was larger than that of the other group. Within the inhalation group, the left heart blood showed the largest c.v. values and this was probably due to redistribution of the cyanide by bloodstream after attainment of the maximal concentration.  相似文献   
993.
994.
As part of an European-South American study of deliberate violence cases of violence against women greater than or equal to 15 years of age and violence against and among children under the age of 15 years were registered at 3 Danish emergency wards and at the Institute of Forensic Medicine in Copenhagen. 352 cases of violence against women and 46 cases of violence against children were registered in the three emergency wards corresponding to rates of about 1.6/1000 per year for women, 0.6/1000 per year for boys and 0.7/1000 per year for girls in a provincial/rural district, the catchment region of Holbaek County Hospital, 3.4/1000 per year for women, 2.8/1000 per year for boys and 0.6/1000 per year for girls in a mainly middle income area of the metropolis Copenhagen, the catchment region of Frederiksberg Hospital, and 4.0/1000 per year for women, 4.0/1000 per year for boys and 0.9/1000 per year for girls in a mainly low income area of Copenhagen, the catchment region of the Rigshospital. Nineteen live adult female victims and 17 dead adult female victims of violence were registered in the Institute of Forensic Medicine in Copenhagen, where also one was registered as a victim of homicide. Nearly half of the adult live female victims of violence had been injured at home while this was the case for approximately three fourth of the dead victims. In 35% of the live cases the husband was the aggressor and in 12% a former cohabitant. In 71% of the homicide cases the husband was the aggressor. The live women appeared to have fewer but more serious lesions than men. The pattern of deliberate violence against women appears to be associated with socio-economic and cultural factors. In cases with a preceding quarrel there is statistically a link to alcohol intoxication. In half of the cases of violence against children the aggressor was known to the victim, in 15% the aggressor was one of the parents, while 42% of the cases were violence among children. The pattern of violence according to sex, and the distribution and severity of lesions for 10-14 years old children showed resemblance to the situation for adults. The lesions were more serious in young infant victims, especially boys, than in adult victims.  相似文献   
995.
996.
The technique of environmental impact analysis (EIA) was developed initially in the United States in response to a requirement of the National 15nvironmental Policy Act of 1969. Now adopted with variations in at least 3 0 countries antf by the European Community, EIA has proved to be a va1ua't)le component of a group of related techniques for discovering and projectirig the probable consequences of proposed action. In pursuit of iriprovenicnt in analytic technique, however, the policy rationale for EIA has too oftcii been obscured. EIA depends for full effectiveness upon in- tcgration into the policy-making process. Separated from commitment to environmental policy objectives, El.4 IS at risk of becoming redundant paperwork.  相似文献   
997.
998.
A sensitive enzyme-linked immunosorbent assay (ELISA) for detection of ABO blood substances in human body fluids was devised. The ELISA plates coated with purified human anti-A or anti-B serum effectively captured the blood substances, and these were then analysed by the combination of rabbit anti-A and goat anti-B. This capture ELISA could differentiate the type AB specimen from a mixture of the type A and the type B specimens, and the method was applied to rape cases to make the ABO typing of the criminal.  相似文献   
999.
Confidentiality in the medical relationship is an important, but by no means absolute, concept. It is a means by which the law protects the patient's privacy. But there are sometimes more important ideals than the protection of privacy. In order to determine whether confidentiality is to be recognised, the patient's interest in his privacy must be balanced with other potentially conflicting interests. Each legal system must determine for itself the weight to be given to any particular interest.  相似文献   
1000.
The literature on age estimation from the structure of adult human teeth is reviewed. Several anatomic changes of teeth have been shown to be valuable in age determination, but there is still controversy concerning the accuracy of cemental annulation. It is believed that improvements in age estimation can be made using direct measurement rather than scoring systems.  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