全文获取类型
收费全文 | 32274篇 |
免费 | 1584篇 |
专业分类
各国政治 | 1358篇 |
工人农民 | 1429篇 |
世界政治 | 2059篇 |
外交国际关系 | 1126篇 |
法律 | 20667篇 |
中国共产党 | 108篇 |
中国政治 | 427篇 |
政治理论 | 6038篇 |
综合类 | 646篇 |
出版年
2021年 | 177篇 |
2020年 | 590篇 |
2019年 | 609篇 |
2018年 | 824篇 |
2017年 | 901篇 |
2016年 | 1003篇 |
2015年 | 773篇 |
2014年 | 834篇 |
2013年 | 3239篇 |
2012年 | 850篇 |
2011年 | 924篇 |
2010年 | 917篇 |
2009年 | 984篇 |
2008年 | 983篇 |
2007年 | 1048篇 |
2006年 | 1051篇 |
2005年 | 869篇 |
2004年 | 833篇 |
2003年 | 748篇 |
2002年 | 759篇 |
2001年 | 1129篇 |
2000年 | 1004篇 |
1999年 | 816篇 |
1998年 | 446篇 |
1997年 | 351篇 |
1996年 | 379篇 |
1995年 | 347篇 |
1994年 | 348篇 |
1993年 | 342篇 |
1992年 | 551篇 |
1991年 | 592篇 |
1990年 | 576篇 |
1989年 | 541篇 |
1988年 | 584篇 |
1987年 | 558篇 |
1986年 | 613篇 |
1985年 | 566篇 |
1984年 | 475篇 |
1983年 | 459篇 |
1982年 | 320篇 |
1981年 | 332篇 |
1980年 | 286篇 |
1979年 | 401篇 |
1978年 | 265篇 |
1977年 | 214篇 |
1976年 | 181篇 |
1975年 | 224篇 |
1974年 | 253篇 |
1973年 | 221篇 |
1972年 | 168篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
31.
32.
33.
Stab wounds were made in parenchymatous organs (e.g. liver, spleen, kidneys, lungs) using a variety of instruments. The shape of the resulting canal was investigated by X-ray analysis after introduction of an X-ray contrast medium. The best contrast was obtained using a contrast medium containing barium. The shape of the canal gave a direct representation of the outline of the instrument used. The width of the canal was however, always several millimeters smaller than the corresponding blade of the instrument. The position of the blade back in single-edged blades could be demonstrated with stronger contrast. 相似文献
34.
The lungs of 79 children who had died between the ages of 1 week and 2 years old were histologically examined. 59 of these children could be categorized as cases of Sudden Infant Death because of the history and postmortem findings. In the remaining 20 cases a definite cause of death could be established. This is the same collective on which the histological investigations of the lymphatic tissue has been carried out. Morphological changes which are typical for a virus pneumonia were found in a substantially higher frequency in the cases of Sudden Infant Death than in the control cases. The validity of these findings and their possible significance for the cause of death are discussed. 相似文献
35.
The conventional wisdom in criminology is that adult onset of offending is a rare event. Closer examination of the extant literature that use official records, however, reveals that an average of 50 percent of adult offenders initiate offending at age eighteen or older. Although criminological research has investigated late onset offending in adolescence, there is little research on adult onset offending and the correlates of adult offending. Using police contact and interview data from the 1942 and 1949 birth cohort data from Racine, WI, this study investigated the correlates of crime for adult onset and persistent offenders. The results show that employment is the only correlate to affect the probability of adult offending differently for previously delinquent and nondelinquent offenders. This article concludes by highlighting the neglect of research on adult offenders, specifically the large percentage of adult onset offenders, and calling for more research on this topic. 相似文献
36.
Restriction fragment length polymorphism (RFLP) analysis for the purpose of individualization is now being used in casework in the People's Republic of China. This report describes the use of the multilocus minisatellite probe 33.15 to solve three cases, including two homicides and a rape. In the third case, fetal tissue was analyzed to prove that the alleged rapist was, in fact, the father. In each case, analysis of deoxyribonucleic acid (DNA) resulted in a positive match. The probability of chance association of the DNA fingerprint was calculated as 5.6 x 10(-12), which is similar to the figures reported in the literature. 相似文献
37.
38.
The individuality of fibres used to provide forensic evidence--not all blue polyesters are the same.
Fibres used in forensic casework suffer from a disadvantage common to other forms of trace evidence--it is not possible to state with absolute certainty that they originate from a specific source. Target fibre studies, population studies and research on 'blocks of colour' have effectively demonstrated the polymorphism of textile fibres (particularly man-made ones) and have shown that when a fibre is believed to have a specific putative source, the chance that it has originated from a different source purely by coincidence is extremely remote. A study by Houck MM (Houck MM, Inter-comparison of unrelated fibre evidence. Forensic Science International 2003; 135: 146-149) has shown that no coincidental matching fibres were recovered from items of clothing examined in 20 unrelated crimes. The study involved over two million comparisons. This work goes a step further, and using the example of blue polyester fibres shows that even within a very narrow segment of the whole general fibre population, many examples of a specific colour/type of man-made fibre taken from random sources can be compared and the chance of any two being the same is very low. These studies should help to show the specificity and value of transferred fibres in providing forensic evidence. 相似文献
39.
40.
Theodore M. Brown 《The Journal of law, medicine & ethics》1987,15(3):156-159
Book Reviews in This Article:
Robert Jay Lifton, The Nazi Doctors: Medical Killing and the Psychology of Genocide.
Eric Stovcr and Elena O. Nightingak, eds., The Breaking of Bodies and Minds: Torture, Psychiatric Abuse and the Health Professions.
Elliot S. Valenstein, Great and Desperate Cures: The Rise and Decline of Psychosurgery and Other Related Treatments for Mental Illness. 相似文献
Robert Jay Lifton, The Nazi Doctors: Medical Killing and the Psychology of Genocide.
Eric Stovcr and Elena O. Nightingak, eds., The Breaking of Bodies and Minds: Torture, Psychiatric Abuse and the Health Professions.
Elliot S. Valenstein, Great and Desperate Cures: The Rise and Decline of Psychosurgery and Other Related Treatments for Mental Illness. 相似文献