全文获取类型
收费全文 | 16987篇 |
免费 | 497篇 |
专业分类
各国政治 | 701篇 |
工人农民 | 660篇 |
世界政治 | 1414篇 |
外交国际关系 | 580篇 |
法律 | 10216篇 |
中国共产党 | 2篇 |
中国政治 | 75篇 |
政治理论 | 3663篇 |
综合类 | 173篇 |
出版年
2020年 | 212篇 |
2019年 | 248篇 |
2018年 | 321篇 |
2017年 | 385篇 |
2016年 | 412篇 |
2015年 | 288篇 |
2014年 | 331篇 |
2013年 | 1648篇 |
2012年 | 405篇 |
2011年 | 427篇 |
2010年 | 343篇 |
2009年 | 377篇 |
2008年 | 439篇 |
2007年 | 459篇 |
2006年 | 440篇 |
2005年 | 390篇 |
2004年 | 393篇 |
2003年 | 413篇 |
2002年 | 374篇 |
2001年 | 678篇 |
2000年 | 613篇 |
1999年 | 505篇 |
1998年 | 284篇 |
1997年 | 241篇 |
1996年 | 203篇 |
1995年 | 203篇 |
1994年 | 243篇 |
1993年 | 218篇 |
1992年 | 335篇 |
1991年 | 368篇 |
1990年 | 325篇 |
1989年 | 344篇 |
1988年 | 316篇 |
1987年 | 332篇 |
1986年 | 337篇 |
1985年 | 330篇 |
1984年 | 284篇 |
1983年 | 316篇 |
1982年 | 255篇 |
1981年 | 238篇 |
1980年 | 178篇 |
1979年 | 246篇 |
1978年 | 166篇 |
1977年 | 144篇 |
1976年 | 130篇 |
1975年 | 121篇 |
1974年 | 135篇 |
1973年 | 117篇 |
1972年 | 112篇 |
1971年 | 94篇 |
排序方式: 共有10000条查询结果,搜索用时 125 毫秒
971.
972.
973.
974.
975.
976.
977.
Dolgin JL 《Brooklyn law review》2000,66(3):755-822
978.
The goal of the present study was to determine the relationship between substance use, drug selling, and lethal violence in adolescent male homicide offenders and their victims. The study employed a retrospective review of criminal justice databases and medical examiner records for murders committed by 25 adolescent males incarcerated in the Commonwealth of Virginia juvenile correctional centers from February 1992 to July 1996. The perpetrator sample was 84% African American and 16% white. The average age at the time of the offense was 15.0 years (range = 13.0 to 17.7 years). The victims were 84% male, 60% African American and 32% white. The median victim age was 28.0 years (mean = 34.8, range = 17 months to 75 years). The results indicated that 52% of the murders were committed by juveniles with identified involvement in drug selling, and 28% of the murders were drug-related. Toxicology results indicated recent drug or alcohol use in 27% of the victims; while 74% of the perpetrators reported substance use, 35% indicating daily use. Using discriminant analysis, it was possible to accurately classify 86% of the drug-related murders with the variables of recent victim drug use and perpetrator substance use history. The results indicated that adolescent males involved in the sale and distribution of illegal drugs comprised a significant percentage of those incarcerated for murder. Recent victim drug use and perpetrator substance use may be important variables in identifying drug-related juvenile homicides. These results underscore the link between substance use, drug selling, and lethal violence. 相似文献
979.
Corte-Real F Andrade L Anjos MJ Carvalho M Vieira DN Carracedo A Vide MC 《Journal of forensic sciences》2000,45(2):432-435
The Short Tandem Repeats (STRs) D3S1358, HUMvWA31/A, HUMFIBRA/FGA, D8S 1179, D2S11, D18S51, D5S818, D13S317, and D7S820 were studied in two Brazilian populations (from Amazonia and S. Paulo) using the "AmpF1 STR Profiler Plus PCR Amplification Kit." The nine loci showed a combined discrimination power greater than 0.9999999999 and a chance of exclusion of 0.9999. 相似文献
980.
Postmortem redistribution of morphine and its metabolites 总被引:2,自引:0,他引:2
The postmortem redistribution of morphine, morphine-3-glucuronide, morphine-6-glucuronide and total morphine was assessed in 40 heroin-related deaths. In blood taken from subclavian, heart, and femoral regions, concentrations of morphine and its metabolites were similar. While there was a trend for higher concentrations in heart blood, when compared with femoral or subclavian blood, this was not significant. There was also no significant difference in concentrations between admission and autopsy blood in which the postmortem interval was on average 59 h. From our observations, significant postmortem redistribution of morphine and its metabolites seems unlikely. 相似文献