全文获取类型
收费全文 | 1218篇 |
免费 | 25篇 |
专业分类
各国政治 | 65篇 |
工人农民 | 46篇 |
世界政治 | 90篇 |
外交国际关系 | 35篇 |
法律 | 845篇 |
中国政治 | 21篇 |
政治理论 | 132篇 |
综合类 | 9篇 |
出版年
2023年 | 6篇 |
2022年 | 6篇 |
2021年 | 13篇 |
2020年 | 21篇 |
2019年 | 32篇 |
2018年 | 35篇 |
2017年 | 28篇 |
2016年 | 36篇 |
2015年 | 21篇 |
2014年 | 23篇 |
2013年 | 102篇 |
2012年 | 33篇 |
2011年 | 32篇 |
2010年 | 25篇 |
2009年 | 23篇 |
2008年 | 31篇 |
2007年 | 18篇 |
2006年 | 17篇 |
2005年 | 31篇 |
2004年 | 44篇 |
2003年 | 41篇 |
2002年 | 29篇 |
2001年 | 103篇 |
2000年 | 70篇 |
1999年 | 74篇 |
1998年 | 36篇 |
1997年 | 6篇 |
1996年 | 5篇 |
1995年 | 10篇 |
1994年 | 4篇 |
1993年 | 10篇 |
1992年 | 21篇 |
1991年 | 19篇 |
1990年 | 39篇 |
1989年 | 27篇 |
1988年 | 30篇 |
1987年 | 24篇 |
1986年 | 14篇 |
1985年 | 14篇 |
1984年 | 8篇 |
1983年 | 9篇 |
1982年 | 11篇 |
1981年 | 9篇 |
1980年 | 5篇 |
1979年 | 11篇 |
1978年 | 7篇 |
1973年 | 5篇 |
1971年 | 4篇 |
1970年 | 3篇 |
1968年 | 4篇 |
排序方式: 共有1243条查询结果,搜索用时 15 毫秒
61.
62.
建立了生物检材中芬氟拉明的定性定量分析方法。体液及脏器组织经有机溶剂提取后 ,用GC/MS法进行药物筛选、定性 ,生物检材中的芬氟拉明浓度用4 -苯丁胺作内标、GC/NPD法测定。测得芬氟拉明中毒致死者的血液、尿液、肝等组织中浓度分别为7.8μg/ml、64.2μg/ml、31.3μg/g。并对尸体解剖所见及方法可行性进行讨论 相似文献
63.
64.
65.
66.
Radioimmunoassay of alpha 1-fetoprotein(AFP) for medico-legal identification of fetal blood stains using a commercial kit is described. The AFP content in fetal blood stains on filter paper ranged from 21--320 ng/9 mm2. The protein was detected in stains of adult blood and retroplacental blood in only negligible amounts. Aging of the blood stains did not influence the values up to 1 month. The method is simple and sensitive enough for application to medico-legal-practice. 相似文献
67.
This ecological study examined the association between seven socioeconomic indicators (GDP, unemployment rate, female labor force participation rate, alcohol expenditure, marriage rate, percentage of births outside of marriage, and indictable crime rate) and total, male, and female rates of suicide and suicide plus undetermined death in Ireland during the period 1968-2000. Analysis of the data expressed as absolute values showed highly significant associations between the socioeconomic indicators and the total, male, and female suicide rates. However, these associations were explained by the strongly trended data. The trended nature of the data was removed by using year-to-year differences. Analysis of the first-differenced data showed that none of the socioeconomic indicators was associated with the total, male, or female suicide rates with the exception of indictable crime, which had a significant independent effect on the female suicide rate (coefficient = 2.0, p < .01) but not on suicide plus undetermined death. This study highlights the need to use econometric methods in time-trend analyses, the lack of age-sex specific exposure data in this area, and the challenge of understanding trends in suicide in their socioeconomic context. 相似文献
68.
A few papers in the literature reported incident deaths by acute ketamine poisoning. In this paper, we report an unusual homicide caused by chronic ketamine poisoning. The victim was a 34-year old married woman with no previous medical history (except as reported herein) who died in her own home. The court investigation revealed that she was chronically poisoned by her husband over a period of about one year in an act of homicide. Determination of ketamine concentrations in autopsy specimens was carried out with gas-chromatography/mass spectrometry (GC-MS). The results showed that ketamine concentration was 21 microg/mL in gastric contents, 3.8 microg/mL in blood and 1.2 microg/mL in urine. The most striking forensic findings were cardiac muscle fibrosis and hyaline degeneration of small arteries in victim's heart, the pathological features of ketamine poisoning previous reported only in animal studies. 相似文献
69.
70.