全文获取类型
收费全文 | 12334篇 |
免费 | 420篇 |
专业分类
各国政治 | 791篇 |
工人农民 | 485篇 |
世界政治 | 999篇 |
外交国际关系 | 680篇 |
法律 | 6679篇 |
中国政治 | 87篇 |
政治理论 | 2926篇 |
综合类 | 107篇 |
出版年
2021年 | 69篇 |
2020年 | 154篇 |
2019年 | 197篇 |
2018年 | 309篇 |
2017年 | 332篇 |
2016年 | 392篇 |
2015年 | 240篇 |
2014年 | 289篇 |
2013年 | 1612篇 |
2012年 | 320篇 |
2011年 | 322篇 |
2010年 | 289篇 |
2009年 | 296篇 |
2008年 | 370篇 |
2007年 | 418篇 |
2006年 | 393篇 |
2005年 | 334篇 |
2004年 | 332篇 |
2003年 | 318篇 |
2002年 | 288篇 |
2001年 | 374篇 |
2000年 | 327篇 |
1999年 | 330篇 |
1998年 | 176篇 |
1997年 | 162篇 |
1996年 | 141篇 |
1995年 | 127篇 |
1994年 | 141篇 |
1993年 | 141篇 |
1992年 | 187篇 |
1991年 | 218篇 |
1990年 | 213篇 |
1989年 | 192篇 |
1988年 | 207篇 |
1987年 | 203篇 |
1986年 | 206篇 |
1985年 | 184篇 |
1984年 | 168篇 |
1983年 | 147篇 |
1982年 | 108篇 |
1981年 | 120篇 |
1980年 | 86篇 |
1979年 | 145篇 |
1978年 | 104篇 |
1977年 | 88篇 |
1976年 | 69篇 |
1975年 | 94篇 |
1974年 | 109篇 |
1973年 | 91篇 |
1971年 | 62篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
911.
912.
913.
914.
DNA profiling using STRs on the 310 and 3100 Genetic Analyzers routinely generates electropherograms that are analyzed with the GeneScan software available from the instrument's manufacturer, Applied Biosystems. Users have been able to choose from three different smoothing options that have been known to result in significant differences in the peak heights that are reported. Improvements in the underlying algorithm of the most recent version of the software also result in significant and somewhat predictable differences in peak height values. Laboratories that have performed validation studies using older versions of GeneScan should either reanalyze the data generated in those validation studies with the newest version of the software or otherwise take into consideration the systematically higher peak height values obtained as they begin following the recommendation of the manufacturer and use the new algorithm. 相似文献
915.
Koehler SA Luckasevic TM Rozin L Shakir A Ladham S Omalu B Dominick J Wecht CH 《Journal of forensic sciences》2004,49(2):345-350
Each year over 3 million new chainsaws are sold in the United States. The operation of these newer saws combined with the millions of older chainsaws in circulation results in over 28,000 chainsaw-related injures annually. The majority of the injuries involve the hands and lower extremities with less than 10% involving injuries to the head and neck regions. Deaths while operating a chainsaw are extremely rare. The most common hazards associated with chainsaws are injuries caused by kickback, pushback, and pull-in. Kickback is the most common and poses the greatest hazard. Kickback occurs when the rotating chain is stopped suddenly by contact with a more solid area throwing the saw rapidly backward toward the operator. The cause of most injuries can be traced to improper use of the saw or poor judgment on part of the operator. We present two fatal chainsaw deaths; one with an older style saw, and the other with a modern type. In both cases the victims died from fatal injuries received to the neck region from a chainsaw kickback. The first case involved a 49-year-old white male operating an older style chainsaw with limited safety features. The second case involved a 38-year old white male who was operating a newer model chainsaw equipped with a low kickback chain in an unsafe manner. 相似文献
916.
During a walk a man found the partially unclothed body of a 16-year-old girl in a field near a village in South Baden. The body showed numerous injuries caused by sharp force. Several stab wounds were discernible on the neck, the chest, the genital region, the back and the right thigh. Postmortem, the anterior wall of the trunk had been severed with one long cut reaching from the mons pubis to the jugular fossa. The injuries and the scene suggested homicide with a sexual motive. Already on the next day a male suspect was ascertained. Blood traces of the victim could be demonstrated on his car. The man confessed the homicide, but did not describe the course of events in detail. He denied a sexual motive for the homicide. The psychiatric examination did not furnish any clues to internal, neurological or psychiatric disorders. The perpetrator did not claim intoxication for the time of the offence, which might have been relevant for the question of criminal responsibility. Psychodiagnostically, it was found that he had a narcissistic personality structure with a pronounced lack of self-esteem, deficits in affect processing and control as well as anxiety and aggression problems. The man was sentenced to life imprisonment for murder. 相似文献
917.
918.
Padosch SA Schmidt PH Schyma C Hirsch RD Kröner LU Dettmeyer RB Madea B 《Archiv für Kriminologie》2004,214(5-6):149-162
The second part of the paper on suicides by gunshots to the head in the presence of witnesses focuses on relevant morphological autopsy findings such as entrance site, signs of close range or contact shots, bullet path etc. and also discusses selected aspects of ascertaining gunshot residues. For the identification of the shooter an integral medicolegal assessment of all the facts including the investigation results and the autopsy findings is essential. However, the morphological findings alone do not allow safe diagnosis, as for example in a homicide the temporal region, which was affected in all our cases, may have been deliberately chosen by the perpetrator as a localization typical of suicide. Thus methods to ascertain gunshot residues on the firing hand (by means of adhesive films and the polyvinyl-alcohol collection method--PVAL) are of great practical importance. In seven cases adhesive films and/or the polyvinyl-alcohol collection method were used. In one case the gunshot residues (GSR) were analysed by means of tape lifts and subsequent scanning electron microscopy (SEM). It was found that especially the combined application of topographical (adhesive tape/PVAL) and cumulative (SEM) methods allowed for the doubtless identification of the shooter, thus usually confirming the suicide. By the example of one case it is demonstrated that without the immediate collection of evidence at the scene objective reconstruction of the event becomes impossible. On the basis of the reported cases recommendations are finally given for a differentiated approach in the medicolegal evaluation of alleged witnessed suicide by gunshot (to the head). 相似文献
919.
920.