全文获取类型
收费全文 | 7286篇 |
免费 | 461篇 |
专业分类
各国政治 | 342篇 |
工人农民 | 226篇 |
世界政治 | 469篇 |
外交国际关系 | 243篇 |
法律 | 5085篇 |
中国政治 | 35篇 |
政治理论 | 1311篇 |
综合类 | 36篇 |
出版年
2020年 | 160篇 |
2019年 | 174篇 |
2018年 | 178篇 |
2017年 | 216篇 |
2016年 | 215篇 |
2015年 | 200篇 |
2014年 | 189篇 |
2013年 | 754篇 |
2012年 | 164篇 |
2011年 | 173篇 |
2010年 | 208篇 |
2009年 | 223篇 |
2008年 | 170篇 |
2007年 | 161篇 |
2006年 | 174篇 |
2005年 | 163篇 |
2004年 | 181篇 |
2003年 | 163篇 |
2002年 | 141篇 |
2001年 | 311篇 |
2000年 | 254篇 |
1999年 | 227篇 |
1998年 | 98篇 |
1997年 | 65篇 |
1996年 | 71篇 |
1995年 | 79篇 |
1994年 | 88篇 |
1993年 | 89篇 |
1992年 | 157篇 |
1991年 | 159篇 |
1990年 | 147篇 |
1989年 | 157篇 |
1988年 | 124篇 |
1987年 | 139篇 |
1986年 | 129篇 |
1985年 | 135篇 |
1984年 | 103篇 |
1983年 | 117篇 |
1982年 | 83篇 |
1981年 | 79篇 |
1980年 | 55篇 |
1979年 | 109篇 |
1978年 | 70篇 |
1977年 | 59篇 |
1976年 | 52篇 |
1975年 | 47篇 |
1974年 | 55篇 |
1973年 | 55篇 |
1972年 | 44篇 |
1968年 | 41篇 |
排序方式: 共有7747条查询结果,搜索用时 15 毫秒
921.
DAVID P. FARRINGTON ROLF LOEBER MAGDA STOUTHAMER-LOEBER WELMOET B. VAN KAMMEN LAURA SCHMIDT 《犯罪学》1996,34(4):493-517
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
922.
A Steentoft B Teige E Vuori G Ceder P Holmgren E Kaa J Kristinsson P T Normann J Pikkarainen 《Zeitschrift für Rechtsmedizin》1989,102(6):355-365
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
923.
924.
925.
926.
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
927.
928.
929.
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
930.
C Lo Dico Y H Caplan B Levine D F Smyth J E Smialek 《Journal of forensic sciences》1989,34(4):1013-1015
A case is reported where phenol, a disinfectant, was ingested and resulted in the death of a 40-year-old white female. Concentrations of phenol were determined in blood (130 mg/L), urine (47 mg/L), bile (187 mg/L), brain (486 mg/kg), kidney (331 mg/kg), muscle (204 mg/kg), liver (228 mg/kg), and stomach content (668 mg) and compared to other cases reported in the literature. 相似文献