全文获取类型
收费全文 | 3807篇 |
免费 | 135篇 |
专业分类
各国政治 | 131篇 |
工人农民 | 120篇 |
世界政治 | 232篇 |
外交国际关系 | 124篇 |
法律 | 2683篇 |
中国政治 | 36篇 |
政治理论 | 603篇 |
综合类 | 13篇 |
出版年
2021年 | 29篇 |
2020年 | 49篇 |
2019年 | 52篇 |
2018年 | 76篇 |
2017年 | 90篇 |
2016年 | 84篇 |
2015年 | 70篇 |
2014年 | 80篇 |
2013年 | 281篇 |
2012年 | 90篇 |
2011年 | 111篇 |
2010年 | 81篇 |
2009年 | 88篇 |
2008年 | 109篇 |
2007年 | 90篇 |
2006年 | 106篇 |
2005年 | 91篇 |
2004年 | 100篇 |
2003年 | 96篇 |
2002年 | 93篇 |
2001年 | 186篇 |
2000年 | 133篇 |
1999年 | 104篇 |
1998年 | 38篇 |
1997年 | 47篇 |
1996年 | 35篇 |
1995年 | 49篇 |
1994年 | 44篇 |
1993年 | 54篇 |
1992年 | 81篇 |
1991年 | 86篇 |
1990年 | 77篇 |
1989年 | 63篇 |
1988年 | 84篇 |
1987年 | 81篇 |
1986年 | 98篇 |
1985年 | 108篇 |
1984年 | 86篇 |
1983年 | 80篇 |
1982年 | 38篇 |
1981年 | 36篇 |
1979年 | 34篇 |
1978年 | 32篇 |
1975年 | 31篇 |
1974年 | 46篇 |
1973年 | 24篇 |
1972年 | 27篇 |
1971年 | 31篇 |
1970年 | 30篇 |
1968年 | 32篇 |
排序方式: 共有3942条查询结果,搜索用时 15 毫秒
31.
Toxicologic findings in the USS Iowa disaster. 总被引:5,自引:0,他引:5
The toxicologic results from the 47 victims of the explosion on the USS Iowa are presented. Good correlation between carboxyhemoglobin saturations and cause of death was found. There were no correlations between blood cyanide concentrations and causes of death. Volatile analysis suggested postmortem ethanol production rather than antemortem ethanol ingestion. No drugs except nicotine were detected in any of the victims. 相似文献
32.
Presents forensic medical characteristics of the specific features of stabbed and cut injuries of human skin and jersey. Suggests a complex of signs that will help determine some structural parameters of a knife blade and the conditions of its interaction with the injured site of human body. 相似文献
33.
34.
A mock jury study was conducted to test the hypothesis that perceptions of a witness can be biased by presumptuous cross-examination questions. A total of 105 subjects read a rape trial in which the cross-examiner asked a question that implied something negative about the reputation of either the victim or an expert. Within each condition, the question was met with either a denial, an admission, or an objection from the witness's attorney. Results indicated that although ratings of the victim's credibility were not affected by the presumptuous question, the expert's credibility was significantly diminished—even when the question had elicited a denial or a sustained objection. Conceptual and practical implications of these findings are discussed.This research was supported by funds provided to the first author by the Bronfman Science Center. 相似文献
35.
36.
N D Sperber 《Journal of forensic sciences》1990,35(4):838-844
A review of the available literature does not reveal a plausible explanation as to why the incisal edges of maxillary anterior teeth do not always mark clearly. Generally, the mandibular incisal edges do mark with some consistency. This paper demonstrates through test bites on skin that the answer lies in the position of the mandible. 相似文献
37.
Postmortem examination of a former professional basketball player revealed an abnormal heart, most notably a single coronary artery. The literature on single coronary arteries is briefly reviewed, and the possible mechanism which caused the patient's condition is considered. This case is particularly unusual because of the patient's profession, which is so physically demanding. 相似文献
38.
39.
40.
Helena Teixeira Paula Proena Alain Verstraete Francisco Corte-Real Duarte Nuno Vieira 《Forensic Science International Supplement Series》2005,150(2-3):205
An analytical method using solid-phase extraction (SPE) and high-performance liquid chromatography–mass spectrometry (LC–MS) has been developed and validated for the confirmation of Δ9-tetrahydrocannabinol (THC) in oral fluid samples. Oral fluid was extracted using Bond Elut LRC-Certify solid-phase extraction columns (10 cm3, 300 mg) and elution performed with n-hexane/ethyl acetate. Quantitation made use of the selected ion-recording mode (SIR) using the most abundant characteristic ion [THC + H+], m/z 315.31 and the fragment ion, m/z 193.13 for confirmation, and m/z 318.00 for the protonated internal standard, [d3-THC + H+]. The method proved to be precise for THC, in terms of both intra-day and inter-day analyses, with coefficients of variation less than 10%, and the calculated extraction efficiencies for THC ranged from 76 to 83%. Calibration standards spiked with THC between 2 and 100 ng/mL showed a linear relationship (r2 = 0.999). The method presented was applied to the oral fluid samples taken from the volunteers during the largest music event in Portugal, named Rock in Rio-Lisboa. Oral fluid was collected from 40 persons by expectoration and with Salivette®. In 55% of the samples obtained by expectorating, THC was detected with concentration ranges from 1033 to 6552 ng/mL and in 45% of cases THC was detected at concentrations between 51 and 937 ng/mL. However, using Salivette® collection, 26 of the 40 cases had an undetectable THC. 相似文献