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   558篇
  免费   24篇
各国政治   51篇
工人农民   37篇
世界政治   62篇
外交国际关系   20篇
法律   226篇
中国政治   4篇
政治理论   179篇
综合类   3篇
  2023年   4篇
  2021年   8篇
  2020年   7篇
  2019年   10篇
  2018年   27篇
  2017年   19篇
  2016年   25篇
  2015年   6篇
  2014年   10篇
  2013年   89篇
  2012年   11篇
  2011年   14篇
  2010年   17篇
  2009年   10篇
  2008年   14篇
  2007年   21篇
  2006年   21篇
  2005年   11篇
  2004年   11篇
  2003年   18篇
  2002年   13篇
  2001年   4篇
  2000年   13篇
  1999年   7篇
  1998年   8篇
  1997年   7篇
  1995年   5篇
  1994年   8篇
  1993年   6篇
  1992年   10篇
  1991年   5篇
  1990年   8篇
  1989年   6篇
  1987年   6篇
  1986年   5篇
  1985年   15篇
  1984年   4篇
  1983年   9篇
  1982年   12篇
  1981年   7篇
  1980年   4篇
  1979年   8篇
  1977年   5篇
  1974年   3篇
  1973年   8篇
  1970年   4篇
  1968年   5篇
  1966年   5篇
  1965年   3篇
  1943年   3篇
排序方式: 共有582条查询结果,搜索用时 31 毫秒
151.

In the 1990s German conglomerates have attempted to move towards Anglo‐Saxon business values. Siemens saw shareholder value as the key measure of competitiveness. To become more Anglo‐Saxon, the strategy of Siemens was to globalise its business and change corporate culture. These changes have proved to be insufficient. Vertically integrated conglomerates need to break up their business empires, focus on their core competencies and move towards de‐integrated networking relations if they want high stock‐market performance.  相似文献   
152.
153.
154.
155.
156.
The Black Spark     
Henry Hart 《耶鲁评论》2002,90(4):78-79
  相似文献   
157.
158.
Since the World Trade Organization (WTO) was established, Chinahas made large-scale efforts to shape its trade remedy systemthrough legal and organizational changes. Through these changes,China could clarify the meanings of WTO anti-dumping provisionsincluding the provision relating to the definition of domesticindustry. Moreover, procedural disciplines on reviews were fortifiedin Chinese anti-dumping system. While the overall improvementsto the trade remedy system of China are evident, definitionsof several key legal terms, including the concept of "relatedproducers", the negligible import standard, and adjustment factorsfor a fair comparison between normal values and export pricesare still absent, and some legal problems relating to priceundertakings and the countermeasure system remain to be solved.China should continue to proceed with the task of clarificationand improvement of its trade rules.  相似文献   
159.
Each year, reports occur of deaths in individuals, while struggling against physical restraint. The mechanism of these deaths remains unclear. This study aimed to determine the effect of wrist restraint on cardiorespiratory function during maximal exercise. Twelve healthy volunteers underwent 3 incremental maximal exercise tests on a cycle ergometer. In a randomized order, they exercised while unrestrained, with the wrists tied in front of the body or wrists tied behind the back. The primary outcome measures were the number of minutes exercised in each position and heart rate and whole blood lactate level for each stage and on reaching maximum exercise capacity. The mean exercise duration was 19 minutes 6 seconds unrestrained (95% confidence interval [CI] 16 minutes 52 seconds to 20 minutes 57 seconds), 18 minutes 51 seconds (95% CI 17 minutes 51 seconds to 20 minutes 50 seconds) with arms restrained in front and 16 minutes 51 seconds (95% CI 14 minutes 6 seconds to 19 minutes 20 seconds) with the arms restrained behind the body (P = 0.16). There was no significant difference in heart rate or lactate measurements. It is probable that other factors make a more important contribution than wrist restraint behind the body to cardiorespiratory compromise in a struggling and fatigued individual.  相似文献   
160.
Upper respiratory infection and pulmonary inflammation are common in sudden infant death syndrome, but their role in the cause of death remains controversial. Controlled studies comparing clinical upper respiratory infection and inflammation in sudden infant death syndrome with sudden infant deaths caused by accidents and inflicted injuries (controls) are unavailable. Our aim was to compare respiratory inflammation and upper respiratory infection within 48 hours of death and postmortem culture results in these two groups. A retrospective analysis of upper respiratory infection and pathologic variables in the trachea and lung of 155 infants dying of sudden infant death syndrome and 33 control infants was undertaken. Upper respiratory infection was present in 39% of sudden infant death syndrome cases and 40% of control cases. Upper respiratory infection was more likely to have occurred in association with more severe lymphocytic interstitial pneumonitis when sudden infant death syndrome cases and control cases were combined ( P=.04). Proximal and distal tracheal lymphocytic infiltration was more severe in control cases than in sudden infant death syndrome cases ( P=.01 and.01, respectively). Lymphocytic infiltrations of the bronchi, bronchioles, and pulmonary interstitium were similar between groups. Bronchial associated lymphoid tissue was more prominent in control cases ( P=.04). Cultures were positive in 80% of sudden infant death syndrome cases, 78% of which were polymicrobial. Among control cases, 89% were positive, with 94% being polymicrobial. This study confirms that microscopic inflammatory infiltrates in sudden infant death syndrome are not lethal.  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