全文获取类型
收费全文 | 11340篇 |
免费 | 350篇 |
专业分类
各国政治 | 762篇 |
工人农民 | 421篇 |
世界政治 | 914篇 |
外交国际关系 | 524篇 |
法律 | 6163篇 |
中国共产党 | 2篇 |
中国政治 | 157篇 |
政治理论 | 2639篇 |
综合类 | 108篇 |
出版年
2020年 | 148篇 |
2019年 | 173篇 |
2018年 | 252篇 |
2017年 | 273篇 |
2016年 | 294篇 |
2015年 | 242篇 |
2014年 | 245篇 |
2013年 | 1454篇 |
2012年 | 273篇 |
2011年 | 367篇 |
2010年 | 275篇 |
2009年 | 295篇 |
2008年 | 308篇 |
2007年 | 282篇 |
2006年 | 292篇 |
2005年 | 262篇 |
2004年 | 298篇 |
2003年 | 306篇 |
2002年 | 229篇 |
2001年 | 403篇 |
2000年 | 368篇 |
1999年 | 326篇 |
1998年 | 196篇 |
1997年 | 140篇 |
1996年 | 143篇 |
1995年 | 151篇 |
1994年 | 146篇 |
1993年 | 139篇 |
1992年 | 189篇 |
1991年 | 191篇 |
1990年 | 184篇 |
1989年 | 176篇 |
1988年 | 195篇 |
1987年 | 193篇 |
1986年 | 197篇 |
1985年 | 179篇 |
1984年 | 174篇 |
1983年 | 183篇 |
1982年 | 125篇 |
1981年 | 87篇 |
1980年 | 101篇 |
1979年 | 108篇 |
1978年 | 103篇 |
1977年 | 87篇 |
1976年 | 85篇 |
1975年 | 72篇 |
1974年 | 73篇 |
1973年 | 64篇 |
1972年 | 63篇 |
1969年 | 67篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
291.
Although agricultural biotechnology has been a seminal reference point in risk perception studies, public awareness of their exposure to risk deriving from this new technology has been minimal at best. However, recent events indicate there may be growing public concern as new variations of this technology appear. Understanding what drives perceptions of benefits from the third generation of the agricultural biotechnology and what determines public worries are keys for the future of this technology. To this end, this study analyzes survey data from the midsouth region of the United States to construct four separate regression models of perceived benefits from and worries over plant‐made industrial products and plant‐made pharmaceuticals. Findings suggest that while prior experience with and knowledge about agricultural biotechnology has an impact on perceptions of benefits and worries, trust in farmers plays a highly important role in determining perceptions. 相似文献
292.
293.
Romy du Long Judith Fronczek Hans W. M. Niessen Allard C. van der Wal Hans H. de Boer 《法庭科学研究(英文)》2022,7(2):238
Interpreting a myocardial inflammation as causal, contributory or as of no significance at all in the cause of death can be challenging, especially in cases where other pathologic and/or medico-legal findings are also present. To further evaluate the significance of myocardial inflammation as a cause of death we performed a retrospective cohort study of forensic and clinical autopsy cases. We revised the spectrum of histological inflammatory parameters in the myocardium of 79 adult autopsy cases and related these to the reported cause of death. Myocardial slides were reviewed for the distribution and intensity of inflammatory cell infiltrations, the predominant inflammatory cell type, and the presence of inflammation-associated myocyte injury, fibrosis, edema and hemorrhage. Next, the cases were divided over three groups, based on the reported cause of death. Group 1 (n = 27) consisted of all individuals with an obvious unnatural cause of death. Group 2 (n = 29) included all individuals in which myocarditis was interpreted to be one out of more possible causes of death. Group 3 (n = 23) consisted of all individuals in which myocarditis was reported to be the only significant finding at autopsy, and no other cause of death was found. Systematic application of our histological parameters showed that only a diffuse increase of inflammatory cells could discriminate between an incidental presence of inflammation (Group 1) or a potentially significant one (Groups 2 and 3). No other histological parameter showed significant differences between the groups. Our results suggest that generally used histological parameters are often insufficient to differentiate an incidental myocarditis from a (potentially) significant one. 相似文献
294.
A Bj?rneboe G E Bj?rneboe H Gjerde A Bugge C A Drevon J M?rland 《Forensic science international》1987,33(4):243-251
The National Institute of Forensic Toxicology, Oslo, receives blood and urine samples from all Norwegian drivers apprehended on suspicion of driving under the influence of alcohol or drugs. In 1983 we received samples from 1446 drug-suspected drivers, out of which 445 underwent toxicological analysis. The drugs found most frequently were tetrahydrocannabinol (THC) (n = 199), diazepam (n = 166) and amphetamine (n = 102). A cautious interpretation of the data indicate that about 200 of the 445 subjects selected for toxicological analysis drove under severe influence of drugs. Because of the high percentage of submitted cases not analysed for drugs, this figure represents a minimum estimate. Compared with the results from 1978, we found a several-fold increase in detections of THC and amphetamine in 1983. The number of diazepam detections did not increase in a similar way, but we estimated that the diazepam detections would have increased 3-fold if we had analysed as frequent for this drug in 1983 as in 1978. 相似文献
295.
296.
A series of fatal motorcycle accidents from a 7-year period (1977-1983) has been analyzed. Of the fatalities 30 were operators of the motorcycle, 11 pillion passengers and 8 counterparts. Of 41 operators 37% were sober at the time of accident, 66% had measurable blood alcohol concentration (BAC); 59% above 0.08%. In all cases where a pillion passenger was killed, the operator of the motorcycle had a BAC greater than 0.08%. Of the killed counterparts 2 were non-intoxicated, 2 had a BAC greater than 0.08%, and 4 were not tested. The results advocate that the law should restrict alcohol consumption by pillion passengers as well as by the motorcycle operator. Suggestions made to extend the data base needed for developing appropriate alcohol countermeasures by collecting sociodemographic data on drivers killed or seriously injured should be supported. 相似文献
297.
The aims of the authors in this paper has been to check the diagnostic ability of the Cathepsin A, B and D concentrations in the skin wound edges to the differential diagnosis between vital and postmortem wounds. We have studied 56 domestic pigs grouped in seven experimental series consisting of 8 animals in each, according to the time (0, 5, 15, 30 min and 1, 3 and 6 h) after the injury. The enzymatic activities were investigated following the methods by Bowen and Davison Biochem. J., 131 (1973) 417-419, Suhar and Marks J. Biochem., 101 (1979) 23-30 and by Anson (modified by Yamamoto, Eur. J. Biochem., 95 (1979) 459-467) for Cathepsin A, B and D, respectively. For the differential diagnosis between vital and postmortem wounds, our results showed that the most useful markers studied are the Cathepsin A and D activities, Cathepsin D that of the first one. 相似文献
298.
299.
300.
Chloe I. Pedneault Kelly M. Babchishin Martin L. Lalumière Michael C. Seto 《Journal of Sexual Aggression》2020,26(2):193-211
ABSTRACT We examined the associations between childhood sexual abuse (CSA), childhood physical abuse (CPA), sexual domain variables, antisocial tendencies, and sexually coercive behaviour in a non-forensic sample of 173 heterosexual men. CSA was associated with paraphilic interests and experiences, a more extensive sexual life history, and early antisocial tendencies. CPA was associated with paraphilic interests and experiences, more self-reported delinquency, higher sensation seeking, and early antisocial tendencies. Sexual domain variables (e.g. number of sexual partners, sexual interest in sadomasochism) mediated the link between CSA and sexually coercive behaviour, but antisocial domain variables (e.g. delinquency, sensation seeking) did not. Of the two sexual domains examined, extensive sexual life history rather than paraphilias mediated the association between CSA and sexually coercive behaviour. These results suggest CSA and CPA are associated with both sexual and antisocial outcomes, and that, for some victims of CSA, having an extensive sexual life history may account for the association between CSA and sexually coercive behaviour later in life. 相似文献