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   7455篇
  免费   505篇
各国政治   348篇
工人农民   237篇
世界政治   484篇
外交国际关系   271篇
法律   5181篇
中国政治   42篇
政治理论   1360篇
综合类   37篇
  2023年   41篇
  2020年   170篇
  2019年   185篇
  2018年   204篇
  2017年   226篇
  2016年   238篇
  2015年   225篇
  2014年   194篇
  2013年   785篇
  2012年   176篇
  2011年   180篇
  2010年   212篇
  2009年   232篇
  2008年   175篇
  2007年   167篇
  2006年   177篇
  2005年   169篇
  2004年   187篇
  2003年   165篇
  2002年   148篇
  2001年   312篇
  2000年   252篇
  1999年   230篇
  1998年   98篇
  1997年   69篇
  1996年   69篇
  1995年   81篇
  1994年   88篇
  1993年   90篇
  1992年   155篇
  1991年   156篇
  1990年   145篇
  1989年   155篇
  1988年   123篇
  1987年   139篇
  1986年   127篇
  1985年   132篇
  1984年   102篇
  1983年   117篇
  1982年   83篇
  1981年   80篇
  1980年   55篇
  1979年   108篇
  1978年   71篇
  1977年   59篇
  1976年   50篇
  1975年   47篇
  1974年   55篇
  1973年   55篇
  1972年   45篇
排序方式: 共有7960条查询结果,搜索用时 837 毫秒
931.
932.
The Pittsburgh Youth Study is a prospective longitudinal survey of three samples of Pittsburgh boys (each containing about 500 boys) initially studied in first, fourth, and seventh grades. The first two data collection waves yielded self-reported delinquency and combined delinquency seriousness scores (the combined scores based on information from boy, mother, and teacher) for the middle sample (up to an average age of 10.7 years) and oldest sample (up to an average age of 13.9 years). These scores were compared with records of petitions to the Allegheny County Juvenile Court for delinquency offenses before and up to six years after the assessments. The area under the ROC curve was used as a measure of validity. Concurrent validity was higher than predictive validity. The combined scale had similar concurrent validity but greater predictive validity than the self-report scale, and the combined scale also identified a greater number of boys as serious delinquents. Concurrent validity for admitting offenses was higher for Caucasians, but concurrent validity for admitting arrests was higher for African-Americans. There were no consistent ethnic differences in predictive validity. There was an increase in predictive validity, for both African-Americans and Caucasians, by combining self-report data with information from other sources. Afrer controlling for delinquency measures, African-Americans were more likely than Caucasians to be petitioned in the future, but not in the past. In this research, ethnic differences in official delinquency were partly attributable to ethnic differences in delinquent behavior and were not attributable to differential ethnic attrition or differential ethnic validity of measures of delinquent behavior.  相似文献   
933.
Fatal intoxications in the 15-34 age group in the five Nordic countries during the years 1984 and 1985 (Sweden only in 1984) were investigated. The known drug addicts were studied separately. The highest incidence of intoxications, calculated per 10(5) population, was found in Finland (11.3), followed by Denmark (10.3), Sweden (8.5), Iceland (7.2) and Norway (6.6). The percentage of intoxications caused by drugs was 92 in Denmark, 71 in Norway, 66 in Sweden, 50 in Finland and 17 in Iceland. Ethanol intoxications were seen 5-7 and 2-3 times as frequently in Finland and in Iceland, respectively, than in the other three countries. Carbon monoxide intoxications accounted for two-thirds of all fatal intoxications in Iceland. Drug addicts accounted for 62% of all fatal intoxications in the Danish material. The corresponding figures were 33% in the Norwegian, 16% in the Swedish and 5% in the Finnish material. No deaths in drug addicts were found in Iceland. Most drug addicts in Denmark, Norway and Sweden died of hard drugs and most in Norway and Sweden, from heroin or morphine, whereas in Denmark other strong analgesics, such as methadone, dextropropoxyphene and ketobemidone, accounted for 40% of all hard-drug-related fatal intoxications. To a certain extent the results reflect differences in the legal autopsy routines in the various Nordic countries. However, the ascertainment of drug addicts is assumed to be near-complete in each country.  相似文献   
934.
935.
936.
937.
The new Nigerian local government system was clearly intended by its creators to be a representative and democractic system of devolution. The speed with which elected councils have been dissolved and replaced by caretaker committees and state appointees contrasts strangely with the constitutional provision that there should be a system of local government by democratically elected local councils. The constitutionality of dissolution has been confused with the constitutionality of further local government reform. Dissolution should be seen as an emergency measure to be used rarely in cases of proven maladministration by a local government. Further reform and reorganization of a state's system of local government should be regarded as a legitimate power of the state legislature. The role given by the Constitution to local government should not be interpreted as entrenching the system. Constitutional amendment is not required should further reform be necessary.  相似文献   
938.
939.
940.
In three cases of autopsy (cause of death - intoxication and drowning) we found in the lung intraalveolar und intravasal lymphatic tissue and bone-marrow. The results cannot be explained with violence during lifetime, but in tow cases as an effect of fracture of rips caused by external cardiacmassage, in one case by embalming with injection of conservation fluids.  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