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   7943篇
  免费   192篇
各国政治   399篇
工人农民   206篇
世界政治   527篇
外交国际关系   326篇
法律   4831篇
中国共产党   1篇
中国政治   20篇
政治理论   1691篇
综合类   134篇
  2020年   76篇
  2019年   88篇
  2018年   128篇
  2017年   143篇
  2016年   162篇
  2015年   120篇
  2014年   139篇
  2013年   885篇
  2012年   219篇
  2011年   205篇
  2010年   166篇
  2009年   179篇
  2008年   219篇
  2007年   193篇
  2006年   205篇
  2005年   168篇
  2004年   167篇
  2003年   173篇
  2002年   185篇
  2001年   311篇
  2000年   286篇
  1999年   229篇
  1998年   101篇
  1997年   116篇
  1996年   87篇
  1995年   93篇
  1994年   98篇
  1993年   91篇
  1992年   166篇
  1991年   180篇
  1990年   168篇
  1989年   186篇
  1988年   160篇
  1987年   155篇
  1986年   171篇
  1985年   140篇
  1984年   137篇
  1983年   146篇
  1982年   90篇
  1981年   83篇
  1980年   66篇
  1979年   113篇
  1978年   67篇
  1977年   66篇
  1976年   61篇
  1975年   72篇
  1974年   85篇
  1973年   82篇
  1972年   73篇
  1971年   63篇
排序方式: 共有8135条查询结果,搜索用时 31 毫秒
911.
It has been a generally accepted practice among document examiners to request known handwriting standards which duplicate the questioned material under examination.When initials are questioned it is not always possible to have initials duplicated and known signatures are sometimes substituted.A research study was conducted using a sample of 65 writers to determine if the letters in a group of initials were written in the same manner as the capital letters in a signature. The study showed that 69% of the writers in the sample made one or more changes or additions to their initials which were not present when they wrote their signatures.  相似文献   
912.
913.
This paper reports the case of a 22-year-old white male who was found dead in a storage room as a result of a fatal ingestion of cyclopropane. Cyclopropane is a sweet-smelling, irritating gas. Autopsy findings revealed congestion and hemorrhagic edema of the lungs, congestion of the trachea, and early autolysis. Cyclopropane was determined by headspace gas chromatography and mass spectrometry. To our knowledge, this is the first reported fatality involving cyclopropane.  相似文献   
914.
In December of 1987, the Wisconsin supreme court held that all involuntarily committed mental patients in the state had the right to refuse psychotropic medication unless a court held that they were incompetent to make treatment decisions. The authors studied the effects of this decision in a 165-bed forensic hospital over the first six months after implementation of the decision. They found that 29 percent of patients already on psychotropic medication initially refused further treatment as opposed to 75 percent of newly admitted patients. Of refusers, 32 percent eventually resumed taking medication voluntarily; courts overturned the refusals of all the 51 percent who maintained their refusals, after an average delay of over a month. The length of procedural delays actually increased over the six months of the study as the courts learned of the decision. The authors compare their findings with other reported studies of implementation of right to refuse treatment decisions and discuss differences between the right to refuse treatment for civilly and criminally committed patients.  相似文献   
915.
In the course of a scuffle, a youth of 18 years was struck a single blow across the chest with a golf club. He collapsed dead on the spot. At autopsy, a precisely located and highly distinctive patterned imprint abrasion of the precordial region was revealed providing an excellent match with the weapon. The heart showed multiple internal ruptures and there was a laceration of the lingula of the left lung. Injury to the chest wall was confined to the soft tissues, the rib cage and sternum being intact. We postulate a novel mechanism to explain the cardiac rupture.  相似文献   
916.
Kinetics of changes in absorption spectra (240-650 nm) of aqueous extracts from bloodstains of considerable age (11 years) was studied. It was stated that at early storage time modification of globin residue goes parallel to oxidation of haem residue and at continuous time (more than 1 year) of solid phase storage of blood films considerable damage of protein and haem with their subsequent destruction occurs. But intensity of these processes is likely to depend on factors of initial environmental exposure of fresh bloodstains.  相似文献   
917.
918.
919.
920.
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