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   12312篇
  免费   642篇
各国政治   602篇
工人农民   430篇
世界政治   1051篇
外交国际关系   459篇
法律   7804篇
中国共产党   1篇
中国政治   77篇
政治理论   2481篇
综合类   49篇
  2021年   67篇
  2020年   214篇
  2019年   265篇
  2018年   275篇
  2017年   348篇
  2016年   351篇
  2015年   284篇
  2014年   322篇
  2013年   1322篇
  2012年   274篇
  2011年   363篇
  2010年   332篇
  2009年   366篇
  2008年   342篇
  2007年   320篇
  2006年   331篇
  2005年   292篇
  2004年   324篇
  2003年   283篇
  2002年   284篇
  2001年   497篇
  2000年   457篇
  1999年   324篇
  1998年   224篇
  1997年   191篇
  1996年   153篇
  1995年   154篇
  1994年   179篇
  1993年   176篇
  1992年   222篇
  1991年   242篇
  1990年   232篇
  1989年   238篇
  1988年   230篇
  1987年   216篇
  1986年   252篇
  1985年   229篇
  1984年   178篇
  1983年   184篇
  1982年   122篇
  1981年   136篇
  1980年   102篇
  1979年   140篇
  1978年   76篇
  1977年   84篇
  1976年   77篇
  1974年   77篇
  1973年   71篇
  1972年   68篇
  1970年   48篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
941.
The results of extraction of 1,2- and 1,4-dihydroxybenzene from water solutions by the hydrophobic and hydrophilic organic solvents are described. The influence of an extragent nature and of a water-phase pH medium on an extraction degree is demonstrated. The repetition factor needed to extract a preset quantity of examined compounds is calculated.  相似文献   
942.
With due regard for the economic situation in regions, differences in the material-technical and personnel provision of each forensic-medical bureau (FMB), paying capacity of local residents and for other factors, a method for estimating the cost of forensic medical services was elaborated and offered for use. The formula of cost estimation for rendered services allow for basic wages (BW) and bonuses, sick-list and vacation payments, overhead charges (including FMB wear-and-tear), and BW assignment to off-budget funds (which constitute, in total, the self-cost of services) as well as the planned profit and road taxes.  相似文献   
943.
A total of 743 lethal outcomes of thromboembolytic complications of trauma, diseases and certain pathological conditions as observed in 1999-2001 and in the three quarters of 2002 were studied. The undertaken analysis confirmed two factors provoking the pathological thrombosis, i.e. 1. Pathological changes observed in the surface vascular wall preconditioned by mechanical damages, atherosclerotic process and aging; and 2. A slower blood flow due to an impaired blood circulation, a forced positioning and to hypodynamics. While deciding on a possibility of a direct cause-effect relation between past traumas, surgeries, poisonings and death of thromboembolism of the pulmonary arteries (TEPA), such relation can be mentioned only on rare occasions. It is more often the case that an indirect, mediated relationship is found, when TERA evolves due to an unfavorable combination of risk factors, i.e. a forced immobility, changing coagulated blood system, impaired blood vessels etc.  相似文献   
944.
A possibility was studied to use the plaster copies of skulls in the forensic medical identification of personality by applying the craniofacial method. No dependence was found between the plaster casts and the moulding types. Differences between the same craniometric sizes in the skull and in its cast are of an incidental nature. Such incidental deviation is related with an accuracy of determining the localization of craniometric points and with an instrumental precision of measuring devices. The necessity is substantiated that, while making a craniofacial examination, it is necessary to mark all anthropometric points in the skull cast, with the original being a control. The use of a plaster skull cast is possible in those cases, when the burial of the remains must be done in full.  相似文献   
945.
946.
947.
Gupta S 《Time》2001,158(27):99
  相似文献   
948.
949.
950.
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