全文获取类型
收费全文 | 3237篇 |
免费 | 66篇 |
专业分类
各国政治 | 164篇 |
工人农民 | 102篇 |
世界政治 | 228篇 |
外交国际关系 | 96篇 |
法律 | 2296篇 |
中国政治 | 22篇 |
政治理论 | 378篇 |
综合类 | 17篇 |
出版年
2021年 | 24篇 |
2020年 | 48篇 |
2019年 | 37篇 |
2018年 | 52篇 |
2017年 | 76篇 |
2016年 | 81篇 |
2015年 | 47篇 |
2014年 | 67篇 |
2013年 | 270篇 |
2012年 | 91篇 |
2011年 | 84篇 |
2010年 | 49篇 |
2009年 | 50篇 |
2008年 | 78篇 |
2007年 | 100篇 |
2006年 | 96篇 |
2005年 | 93篇 |
2004年 | 101篇 |
2003年 | 88篇 |
2002年 | 95篇 |
2001年 | 177篇 |
2000年 | 132篇 |
1999年 | 84篇 |
1998年 | 27篇 |
1997年 | 21篇 |
1996年 | 22篇 |
1994年 | 23篇 |
1993年 | 23篇 |
1992年 | 66篇 |
1991年 | 74篇 |
1990年 | 67篇 |
1989年 | 90篇 |
1988年 | 87篇 |
1987年 | 76篇 |
1986年 | 76篇 |
1985年 | 66篇 |
1984年 | 37篇 |
1983年 | 43篇 |
1981年 | 30篇 |
1979年 | 31篇 |
1978年 | 22篇 |
1977年 | 28篇 |
1975年 | 31篇 |
1974年 | 31篇 |
1973年 | 34篇 |
1972年 | 34篇 |
1971年 | 32篇 |
1970年 | 20篇 |
1969年 | 24篇 |
1968年 | 20篇 |
排序方式: 共有3303条查询结果,搜索用时 15 毫秒
211.
A table has been created, presenting normal levels of heavy metals (Hg, Cd, Cr, Cu, Fe, Mn, Pb, Ni, Zn, Sn, Tl, Ag) in human biological media. In contrast to other handbooks, the authors use the normal values derived on the basis of their own investigations at the spectral laboratory of Bureau of Forensic Medical Expert Evaluations, Public Health Committee of Moscow and published reports. Comparative analysis was carried out for each element in human organs, tissues, and urine, which will facilitate expert work. Every laboratory engaged in expert evaluations and analysis in cases with suspected poisoning with heavy metal salts is to have reference values of these elements' concentrations in human organs and tissues obtained in this very laboratory on available equipment with consideration for specific features of its biogeochemical region. 相似文献
212.
213.
Solokhin EV Belova TS Strokova VA Kanibolotskiĭ AA Chernolikhova IA Lapteva MI Potemkin AM 《Sudebno-meditsinskaia ekspertiza》2001,44(5):8-11
The pituitary was examined in patients with craniocerebral injuries who died in hospital in various periods after treatment. Control group consisted of victims died at the site of accident. The results indicate the significance of examining the pituitary in craniocerebral injuries for the diagnosis of thanatogenesis, particularly in patients died in hospital. Causes of traumatic changes in the organ were determined, highly incident in the practice of forensic medical experts: directly during injury, as a result of skull bone fractures; during development of dislocation syndrome and in disorders of blood and lymph circulation in the brain matter; resultant from augmenting traumatic edema of the brain. 相似文献
214.
Sosedko IuI 《Sudebno-meditsinskaia ekspertiza》2001,44(6):13-17
A total of 277 forensic expert medical conclusions on cases with closed heart injury are analyzed. The morphology and mechanisms of formation of heart injuries in various traumas are discussed. 相似文献
215.
Posttraumatic thrombosis of the middle cerebral artery 总被引:6,自引:0,他引:6
Bunai Y Nagai A Nakamura I Akaza K Ohya I 《The American journal of forensic medicine and pathology》2001,22(3):299-302
Posttraumatic cerebral infarction resulting from carotid or cerebral artery occlusion is rare. Traumatic dissection of the carotid artery is the most frequent cause of infarction, whereas posttraumatic thrombosis of the cerebral artery is very rare. The authors describe a case of posttraumatic thrombosis of the left middle cerebral artery. Early in the morning, a 16-year-old boy was found unconscious in the parking lot of a supermarket. He had received fist blows and kicks to the head, face, body, back, and hip during the night. Computed tomography 10 hours after the violence revealed a gross cerebral infarction in the area of the left middle cerebral artery. He died 9 days after the violence. The autopsy revealed a thrombosis in the left middle cerebral artery. Microscopically, granulation tissue in the intima and a rupture of the internal elastic lamina were observed near the beginning of the artery. It was concluded that the blows to the head and face caused a partial rupture in the arterial wall, leading to thrombosis and cerebral infarction. 相似文献
216.
217.
de Boer D Bosman IJ Hidvégi E Manzoni C Benkö AA dos Reys LJ Maes RA 《Forensic science international》2001,121(1-2):47-56
1-Aryl-piperazine compounds are, depending on their substituents, selective for certain serotonin receptors and together with their easy availability and their so-called legal status, this group of psychoactive compounds are potential designer drugs-of-abuse. Internet in that respect is an important source of information and distribution facilities. Because this development may have consequences for the interpretation of future clinical and forensic toxicological case studies, some analytical aspects of 1-benzyl-piperazine (BZP), 1-[4-methoxyphenyl]-piperazine (pMeOPP) and 1-[3-trifluoromethylphenyl]-piperazine (TFMPP) were studied. BZP was not detected by the AxSYM FPIA technology designed to determine amphetamine-like compounds, but had showed some cross reactivity with EMIT d.a.u.. The cross reactivities at 300 and 12,000ng/ml (RS)-amphetamine equivalents were 0.4 and 1.3%, respectively. Although BZP was not identified directly by the REMEDi HS Drug Profiling System, it can be detected by this HPLC/UV scanning system. Using GC/NPD without derivatisation, BZP, pMeOPP and TFMPP can be analysed for and applying GC/MS without or with acetylation or trifluoroacetylation, these compounds can be identified unambiguously. The usefulness of GC/NPD and GC/MS in this respect was demonstrated by the quantitative and qualitative analysis of the content of a capsule with the synthetic stimulant A2, which proved to contain 86.4mg of BZP. 相似文献
218.
Lareu M Puente J Sobrino B Quintáns B Brión M Carracedo A 《Forensic science international》2001,118(2-3):163-168
A novel methodology based on PCR monitoring on-line with fluorescent formats using the LightCycler for Y chromosome SNP typing is proposed. The main advantages of the system are the time necessary for the analysis (which is around 20 min), the robustness and the accuracy of the method and especially its sensitivity, which permits the detection of the male component in male-female mixtures up to 1:300 for some of the SNPs.Singleplexes of four different SNPs (M9, sY81, SRY-1532 and SRY-2627) as well as two duplexes (M9 and sY81 on the one hand and SRY-1532 and SRY-2627 on the other) were efficiently implemented. A simultaneous amplification and analysis of the four SNPs is also possible. It seems difficult with the current methodology to implement more than a quadruplex. 相似文献
219.
This study examines the effects of profound hypothermia on the blood-brain barrier (BBB) permeability in ethanol administrated rats. Vascular permeability to intravenously injected Evans blue (EB) was quantitatively examined in the brain regions of rats. Rats were treated with ethanol acute and chronically. Rectal temperature of rats was dropped into 20+/-1 degrees C during profound hypothermia. Mean arterial blood pressure in both acute and chronic ethanol treatments plus hypothermia significantly dropped into low levels as well as in hypothermia alone (P<0.01). Hypothermia led to a significant increase in the content of EB dye in the brain regions of rats (P<0.05). Both acute and chronic ethanol treatments plus hypothermia did not lead to a significant increase in the BBB permeability against intravenously injected EB dye. We conclude that ethanol intake protects the BBB against the effects of hypothermia. 相似文献
220.