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   67801篇
  免费   3286篇
各国政治   4486篇
工人农民   2868篇
世界政治   6034篇
外交国际关系   3810篇
法律   31511篇
中国共产党   11篇
中国政治   778篇
政治理论   20644篇
综合类   945篇
  2021年   402篇
  2020年   1159篇
  2019年   1521篇
  2018年   1678篇
  2017年   1955篇
  2016年   2185篇
  2015年   1824篇
  2014年   2105篇
  2013年   10515篇
  2012年   1608篇
  2011年   1713篇
  2010年   1815篇
  2009年   2077篇
  2008年   1735篇
  2007年   1708篇
  2006年   1876篇
  2005年   1767篇
  2004年   1656篇
  2003年   1477篇
  2002年   1489篇
  2001年   1542篇
  2000年   1352篇
  1999年   1235篇
  1998年   1108篇
  1997年   972篇
  1996年   956篇
  1995年   914篇
  1994年   912篇
  1993年   931篇
  1992年   937篇
  1991年   964篇
  1990年   907篇
  1989年   946篇
  1988年   943篇
  1987年   976篇
  1986年   943篇
  1985年   1014篇
  1984年   908篇
  1983年   972篇
  1982年   874篇
  1981年   825篇
  1980年   653篇
  1979年   674篇
  1978年   590篇
  1977年   520篇
  1976年   483篇
  1975年   400篇
  1974年   395篇
  1973年   407篇
  1972年   359篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
381.
382.
383.
384.
385.
386.
Ministerial reshuffles are complex exercises requiring careful handling. A frequent occurrence in British government, their significance is usually seen in political terms. Prime Ministers attach great importance to maximizing the political advantages to be gained from them. This factor is the chief determinant of their logistics, the principal characteristics of which are secrecy in advance and the speed with which ministerial changes are executed. These features - as much as the frequency of ministerial changes per se - may disrupt the policy process and have serious implications for minister-civil servant power relations. Such problems could be alleviated by giving ministers advance notice of changes of post. The institution of a process of ministerial handovers would strengthen the position of incoming ministers by making them less dependent on their officials, upon whom they rely heavily for initial briefing at present.  相似文献   
387.
On the one hand the following case demonstrates the problems of finding a dead body in the bathroom and on the other hand the importance of postmortem x-ray examinations. The corpse of an 65-year-old woman was discovered in her bath tub. At the body's feet there was a hair dryer. Investigations concerning murder were negative, circumstances appeared to be unsuspicious. That was why a postmortem examination was not performed. -4 years later murder had to be considered. After manual strangling the deceased and the hair dryer were layed into the bath tub. The corpse was exhumed and taken to a forensic autopsy. It was found that the hyoid bone and the superior horn of the thyroid cartilage were both fractured on the right. Damages caused by the preparation itself were excluded by using serial roentgenographs. These observations in combination with histological findings and the results of further investigations convincingly supported the suspicion of strangling by hand.  相似文献   
388.
A gas chromatographic (GC) fingerprint method, based on the presence or absence of six congeners, was developed for illicit cocaine samples. The fingerprint utilizes the relative abundances of these congeners towards each other, disregarding cocaine as the main constituent, and can be expressed numerically or graphically in the form of pictograms for rapid visual comparison. The method can be applied directly to a solution of the sample in chloroform, without previous workup procedures. More than 70 unrelated samples were analyzed and a great variation was observed in the parameter composition. On the other hand, a remarkable similarity could be seen between related samples. The GC fingerprint method may be considered an important contribution for sample comparison, as is exemplified by a subdivision of the analyzed samples in different categories, based on the number and types of congeners found.  相似文献   
389.
During the past decade the field of psychology of law has changed considerably. Accompanying the growth of research and practice, there has been an increase in offerings of courses in this field. The courses are offered at both undergraduate and graduate levels and cover a wide spectrum of interests. The types of courses currently being offered and the student samples enrolling in the courses are examined. In addition, a review of the major textbooks used in the courses is provided.  相似文献   
390.
A new solid-phase extraction procedure for the determination of cocaine and benzoylecgonine in amniotic fluid, using high flow co-polymeric sorbents is reported. The recoveries of cocaine and benzoylecgonine within the range 0.1-1 mg/l were 95.7% and 50.3%, respectively. The use of high-flow sorbents allowed the easy extraction of amniotic fluid regardless of sample viscosity or physical nature. The use of these solid-phase columns provided many advantages over the more commonly used solvent extraction, including an increase in extraction speed and efficiency, reduced operator time, reduced solvent use and disposal volumes and exceptional extract quality. Further, the determination of amniotic fluid obtained from pregnant cocaine users may provide important information about handling of cocaine by the fetus at various gestational ages. The procedure was successfully applied to amniotic fluid from suspected cocaine abusers.  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