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   16953篇
  免费   584篇
  国内免费   5篇
各国政治   720篇
工人农民   762篇
世界政治   1111篇
外交国际关系   566篇
法律   10894篇
中国共产党   6篇
中国政治   154篇
政治理论   3158篇
综合类   171篇
  2020年   236篇
  2019年   285篇
  2018年   377篇
  2017年   429篇
  2016年   428篇
  2015年   315篇
  2014年   334篇
  2013年   1577篇
  2012年   475篇
  2011年   505篇
  2010年   421篇
  2009年   433篇
  2008年   517篇
  2007年   569篇
  2006年   531篇
  2005年   483篇
  2004年   478篇
  2003年   506篇
  2002年   431篇
  2001年   672篇
  2000年   555篇
  1999年   488篇
  1998年   248篇
  1997年   173篇
  1996年   203篇
  1995年   174篇
  1994年   200篇
  1993年   197篇
  1992年   324篇
  1991年   354篇
  1990年   341篇
  1989年   291篇
  1988年   323篇
  1987年   271篇
  1986年   318篇
  1985年   283篇
  1984年   234篇
  1983年   228篇
  1982年   175篇
  1981年   194篇
  1980年   128篇
  1979年   173篇
  1978年   123篇
  1977年   108篇
  1976年   98篇
  1975年   123篇
  1974年   132篇
  1973年   103篇
  1972年   101篇
  1969年   98篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
951.
The philosophy of evaluating the need of a victim in extra care is discussed. The method for evaluating the need in transport vehicles for the victim is described in detail. Legislative documents which help solve such problems are cited, including those used by committees of forensic medical evaluations.  相似文献   
952.
953.
A protocol for comparative analysis of heroin making use of chromatographic methods and infra-red spectroscopy is presented.  相似文献   
954.
Examinations of the rudiments of the Russian Orthodox Saints are reviewed. The burial of holy people in Russia is described. The results of examinations of rudiments of the Saints, Reverend Iosaph of Belgorod, Cornilai Padansky, and Arsenii Konevsky, are presented. A detailed algorithm of expert steps is suggested.  相似文献   
955.
Describes the method of comparative analysis of various objects in practical medical criminology and making of high-quality photographs with the use of Adobe Photoshop software. Options of the software needed for expert evaluations are enumerated.  相似文献   
956.
957.
Arterial fibromuscular dysplasia (FMD) represents a collection of noninflammatory and nonatherosclerotic vascular diseases with a poorly understood etiology. Classically occurring in renal and cerebral arteries, this entity has also been reported in coronary, carotid, and other medium and small arteries. One case occurring in the pulmonary vasculature has been reported. Fatal hemothorax and lung hemorrhage have multiple causes, including other vascular malformations and connective tissue disorders; however, cases of pulmonary FMD are exceedingly rare. We report what appears to be the second such association, occurring in a 69-year-old man. The patient presented with a 3-week history of increasing dyspnea, fatigue, and productive cough; 3 days of increasing back and chest pain; and syncope. Chest radiograph showed a "white-out" of the left lung. The patient died shortly after admission from a fulminant respiratory disease of undetermined etiology. At autopsy he was found to have a massive left hemothorax resulting from an unsuspected pulmonary arterial fibromuscular dysplasia.  相似文献   
958.
A rare and potentially fatal cause of hematemesis is fistula formation between the esophagus and the vascular system. A case report of a 39-year-old woman with congenital aortic arch anomalies hospitalized for treatment of head injuries demonstrates the potential for iatrogenic esophageal trauma to initiate fistula formation between the esophagus and an anomalous arterial system. A literature review revealed 6 other cases of vascular-esophageal fistulae caused by nasogastric esophageal intubation. It is concluded that aortic arch anomalies increase the risk of esophageal injury and subsequent fistula formation from nasogastric esophageal intubation. In addition, the clinical features and pathologic findings of vascular-esophageal fistulae are reviewed.  相似文献   
959.
A retrospective analysis of 68 cases of fatal childhood pedestrian accidents in South Australia that occurred over a 20-year period from January 1977 to December 1996 was undertaken. The age range was 12 months to 16 years (average, 7.6 years), with a male to female ratio of 41:27. The most common site of significant injury was the head (91.2%), followed by the abdomen (50%), chest (47.1%), and neck (38.2%). The most frequently encountered significant injury combinations involved the head, chest, and abdomen (14.7%); the head and chest (11.8%); and the head, neck, and abdomen (11.8%). Injuries were severe, consisting of extensive compound and comminuted skull fractures, neck fractures, and massive intraparenchymal brain and internal organ damage with avulsions and fragmentation. Non-life-threatening limb injuries occurred in 88% of cases. A distinct subgroup involved infants and younger children playing in driveways at home who were hit by reversing vehicles. The injuries were often of such a severe nature that death was instantaneous and with no possibility of successful medical intervention. More deaths occurred during the winter than summer months.  相似文献   
960.
The authors report a case of aortic dissection and cardiac tamponade in a 29-year-old man after ingestion of ecstasy (methylenedioxymethamphetamine, MDMA) at a "rave" party. There was no history of hypertension, myxoid heart disease, or other risk factors for aortic dissection in the deceased, although a minor degree of cystic medial necrosis was noted on histologic examination of the aorta. Autopsy toxicology revealed low residual levels of MDMA in the blood about 48 hours after ingestion of the drug. This case report describes a probable association between MDMA ingestion and aortic dissection in a previously well young adult. The likely mechanisms are discussed, and the difficulties in diagnosing this complication are highlighted.  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