全文获取类型
收费全文 | 876篇 |
免费 | 22篇 |
专业分类
各国政治 | 71篇 |
工人农民 | 29篇 |
世界政治 | 80篇 |
外交国际关系 | 60篇 |
法律 | 356篇 |
中国政治 | 9篇 |
政治理论 | 288篇 |
综合类 | 5篇 |
出版年
2023年 | 5篇 |
2022年 | 3篇 |
2021年 | 4篇 |
2020年 | 6篇 |
2019年 | 24篇 |
2018年 | 21篇 |
2017年 | 25篇 |
2016年 | 28篇 |
2015年 | 16篇 |
2014年 | 21篇 |
2013年 | 173篇 |
2012年 | 21篇 |
2011年 | 22篇 |
2010年 | 23篇 |
2009年 | 25篇 |
2008年 | 33篇 |
2007年 | 18篇 |
2006年 | 28篇 |
2005年 | 26篇 |
2004年 | 32篇 |
2003年 | 30篇 |
2002年 | 22篇 |
2001年 | 24篇 |
2000年 | 17篇 |
1999年 | 16篇 |
1998年 | 17篇 |
1997年 | 16篇 |
1996年 | 13篇 |
1995年 | 15篇 |
1994年 | 13篇 |
1993年 | 18篇 |
1992年 | 11篇 |
1991年 | 10篇 |
1990年 | 9篇 |
1989年 | 13篇 |
1988年 | 12篇 |
1987年 | 11篇 |
1986年 | 9篇 |
1985年 | 9篇 |
1984年 | 10篇 |
1983年 | 6篇 |
1982年 | 5篇 |
1981年 | 6篇 |
1979年 | 3篇 |
1978年 | 5篇 |
1976年 | 2篇 |
1975年 | 3篇 |
1974年 | 2篇 |
1972年 | 3篇 |
1969年 | 4篇 |
排序方式: 共有898条查询结果,搜索用时 21 毫秒
271.
272.
273.
274.
Chronic factitious disorder with physical symptoms, or Munchausen syndrome, is a well-recognized but uncommonly diagnosed psychiatric condition characterized by the deliberate production of signs and symptoms of disease in order to receive medical attention. Clinical suspicion of this disease is rarely confirmed by autopsy, as the patients usually do not die as a consequence of feigning illness. Here we report the autopsy confirmation of a case of a suspected Munchausen syndrome patient who presented with a history of cystic fibrosis. Examination of the lungs demonstrated extensive severe interstitial fibrosis, and polariscopic examination revealed a large quantity of crystalline material throughout the tissue; X-ray diffraction identified the material as talc. Synopses of published cases of Munchausen syndrome presenting as cystic fibrosis, and cases of Munchausen syndrome with pulmonary talcosis are presented as part of the discussion. 相似文献
275.
We previously wrote critically on the UK's welfare computerization programme of the 1980s and in this article we investigate the latest programme. Our argument is that welfare is being seen and is being understood in a technological context rather than a truly welfare one— that is, that the technology behind the computerization projects model views of how welfare recipients should be processed. In the 1980s, the computer model that was being applied was one of data processing (i.e. the 'business model'). In the 2000s, it is the model of computer-based communication (i.e. the 'Internet model'). But further, the new technological communication model is being effused with an ethical aspect— that those who do not communicate are lacking in socio-ethical responsibility to society, and are deemed not to be truly living up to their role as citizens. 相似文献
276.
277.
Brandt SD Martins CP Freeman S Dempster N Riby PG Gartz J Alder JF 《Forensic science international》2008,178(2-3):162-170
The psychoactive properties of N,N-dimethyltryptamine (DMT) 1a are known to induce altered states of consciousness in humans. This particular attribute attracts great interest from a variety of scientific and also clandestine communities. Our recent research has confirmed that DMT reacts with dichloromethane (DCM), either as a result of work-up or storage to give a quaternary N-chloromethyl ammonium salt 2a. Furthermore, this was observed to undergo rearrangement during analysis using gas chromatography-mass spectrometry (GC-MS) with products including 3-(2-chloroethyl)indole 3 and 2-methyltetrahydro-beta-carboline 4 (2-Me-THBC). This study further investigates this so far unexplored area of solvent interactions by the exposure of DMT to other halogenated solvents including dibromomethane and 1,2-dichloroethane (DCE). The N-bromomethyl- and N-chloroethyl quaternary ammonium derivatives were subsequently characterised by ion trap GC-MS in electron and chemical ionisation tandem MS mode and by NMR spectroscopy. The DCE-derived derivative formed at least six rearrangement products in the total ion chromatogram. Identification of mass spectrometry generated by-products was verified by conventional or microwave-accelerated synthesis. The use of deuterated DCM and deuterated DMT 1b provided insights into the mechanism of the rearrangements. The presence of potentially characteristic marker molecules may allow the identification of solvents used during the manufacture of controlled substances, which is often neglected since these are considered inert. 相似文献
278.
279.
280.