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   24246篇
  免费   1383篇
各国政治   1071篇
工人农民   1027篇
世界政治   1630篇
外交国际关系   799篇
法律   16585篇
中国共产党   9篇
中国政治   153篇
政治理论   4221篇
综合类   134篇
  2021年   134篇
  2020年   507篇
  2019年   550篇
  2018年   734篇
  2017年   757篇
  2016年   857篇
  2015年   627篇
  2014年   682篇
  2013年   2464篇
  2012年   658篇
  2011年   697篇
  2010年   695篇
  2009年   733篇
  2008年   727篇
  2007年   770篇
  2006年   759篇
  2005年   609篇
  2004年   617篇
  2003年   559篇
  2002年   577篇
  2001年   919篇
  2000年   830篇
  1999年   659篇
  1998年   320篇
  1997年   240篇
  1996年   268篇
  1995年   250篇
  1994年   239篇
  1993年   231篇
  1992年   432篇
  1991年   438篇
  1990年   407篇
  1989年   409篇
  1988年   420篇
  1987年   384篇
  1986年   434篇
  1985年   437篇
  1984年   342篇
  1983年   342篇
  1982年   260篇
  1981年   242篇
  1980年   201篇
  1979年   294篇
  1978年   179篇
  1977年   148篇
  1976年   125篇
  1975年   130篇
  1974年   177篇
  1973年   137篇
  1971年   112篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
This paper investigates how North Korean behaviour towards boththe United States and South Korea is influenced by the popularityof the American President. The study applies theories relatingto strategic conflict avoidance and signalling to suggest thatthe American President is able to demonstrate a willingnessto use force when he is unpopular and as such is better ableto coerce Pyongyang. Using a time-series model, I demonstratethat the North Koreans become more cooperative towards the UnitedStates in response to decreases in presidential popularity andincreasing levels of US inflation. However, the study also showsthat the North Koreans do not alter their behaviour towardsthe South Koreans in response to low American President Popularityratings. The research, therefore, suggests that the North Koreansbelieve that the United States would be unable to launch a diversionaryattack in response to North Korean behaviour towards the South.This study provides a clear support for the strategic avoidanceof conflict hypothesis and suggests that the American Presidentsare best able to coerce North Korea when they are unpopularat home. Received for publication August 31, 2005. Accepted for publication December 21, 2005.  相似文献   
102.
103.
THE BOOKSHELF     
Books reviewed in this article:
G. Andrew Benjamin and Jackie Gollan, Family Evaluation in Custody Litigation: Reducing Risks of Ethical Infractions and Malpractice .  相似文献   
104.
In the statistical interpretation of forensic glass evidence it is standard practice to make the assumption of homogeneity of the refractive index (RI) of the source glass, or of localized homogeneity. However, the work of Locke and Hayes showed that, for toughened windscreen glass, this assumption might not be true. This work is well cited, but there appears to have been little follow-on published research. Furthermore, the toughening process is something known to affect the refractive index, and is a process that float glass does not undergo. Float glass is a major component of casework in New Zealand and for that reason it would be interesting to know whether the findings of Locke and Hayes apply when dealing with float glass. In this paper we describe an experiment similar to that of Locke and Hayes, systematically examining the variation of RI in a pane of float window glass. It was found that, although there were no systematic differences in refractive index, there were observable differences across the pane.  相似文献   
105.
106.
Report of an unusual finding of bones on the shore of the Baltic Sea. Although the morphological findings appeared similar to a human foot skeleton, a quick identification as sea dog bone was possible.  相似文献   
107.
In many countries it is left to the discretion of the court to accept or reject conclusions based on sampling procedures as applied to the total drug exhibit. As an alternative to this subjective approach, a statistical basis is presented using binomial and hypergeometric distributions to determine a lower limit for the proportion of units in a population which contains a drug, at a given confidence level. A method for calculating the total weight of a drug present in a population within a given confidence interval is also presented. In the event of no failures (all units sampled contain a drug), a sample size of six or seven units is generally sufficient to state that a proportion of at least 0.70 of the population contains a drug at a confidence level of at least 90%. When failures do occur in the sample, point estimation is used as the basis for selecting the appropriate sample size.  相似文献   
108.
A case of the sudden death of a 14-month-old girl due to massive hemorrhage in a primitive neuroectodermal tumor (PNET) is presented along with a review of the relevant literature. PNET is a rare, malignant brain neoplasm occurring predominantly in children.  相似文献   
109.
We report a case of rapid death from thrombotic thrombocytopaenic purpura (TTP) in a young pregnant lady who developed full blown symptoms soon after caesarean section. Extensive intramyocardial confluent haemorrhages and widespread microthrombi in heart, brain, adrenals and kidney were found at autopsy. Thrombotic thrombocytopaenic purpura is an uncommon condition, which carries a high fatality rate if untreated. Awareness of this syndrome together with its high risk of sudden death underlines the importance of rapid diagnosis and treatment.  相似文献   
110.
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