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   15597篇
  免费   265篇
各国政治   479篇
工人农民   1276篇
世界政治   678篇
外交国际关系   535篇
法律   9633篇
中国政治   50篇
政治理论   3169篇
综合类   42篇
  2020年   105篇
  2019年   131篇
  2018年   1396篇
  2017年   1346篇
  2016年   1173篇
  2015年   193篇
  2014年   188篇
  2013年   750篇
  2012年   365篇
  2011年   1091篇
  2010年   1154篇
  2009年   728篇
  2008年   925篇
  2007年   895篇
  2006年   241篇
  2005年   243篇
  2004年   370篇
  2003年   345篇
  2002年   198篇
  2001年   322篇
  2000年   305篇
  1999年   225篇
  1998年   103篇
  1997年   87篇
  1996年   103篇
  1995年   99篇
  1994年   99篇
  1993年   65篇
  1992年   145篇
  1991年   160篇
  1990年   141篇
  1989年   158篇
  1988年   136篇
  1987年   152篇
  1986年   136篇
  1985年   155篇
  1984年   130篇
  1983年   146篇
  1982年   97篇
  1981年   96篇
  1980年   71篇
  1979年   105篇
  1978年   84篇
  1977年   78篇
  1976年   57篇
  1975年   47篇
  1974年   58篇
  1973年   60篇
  1971年   51篇
  1970年   47篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
931.
932.
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   
933.
934.
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   
935.
936.
Three fatalities caused by methanol ingestion are reported. Admission blood methanol concentrations ranged from 0.28 to 4.6 g/L. Two patients had been admitted after a significant delay (>20 hours), and one patient was observed within 90 minutes following ingestion. Formic acid levels were determined in blood samples at admission and ranged from 302 to 680 mg/L. The patients died 44, 55, and 82 hours after poisoning. Formic acid determinations in postmortem tissues were performed by a gas chromatograph method. The authors found great variability in formic acid distribution among the patients and among organs.  相似文献   
937.
938.
Since the 1970s, a wide body of research has suggested that the accuracy of clinical risk assessments of violence might be increased if clinicians used actuarial tools. Despite considerable progress in recent years in the development of such tools for violence risk assessment, they remain primarily research instruments, largely ignored in daily clinical practice. We argue that because most existing actuarial tools are based on a main effects regression approach, they do not adequately reflect the contingent nature of the clinical assessment processes. To enhance the use of actuarial violence risk assessment tools, we propose a classification tree rather than a main effects regression approach. In addition, we suggest that by employing two decision thresholds for identifying high- and low-risk cases--instead of the standard single threshold--the use of actuarial tools to make dichotomous risk classification decisions may be further enhanced. These claims are supported with empirical data from the MacArthur Violence Risk Assessment Study.  相似文献   
939.
940.
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