全文获取类型
收费全文 | 11582篇 |
免费 | 630篇 |
专业分类
各国政治 | 489篇 |
工人农民 | 400篇 |
世界政治 | 915篇 |
外交国际关系 | 365篇 |
法律 | 7692篇 |
中国共产党 | 4篇 |
中国政治 | 72篇 |
政治理论 | 2190篇 |
综合类 | 85篇 |
出版年
2021年 | 75篇 |
2020年 | 236篇 |
2019年 | 273篇 |
2018年 | 277篇 |
2017年 | 330篇 |
2016年 | 351篇 |
2015年 | 285篇 |
2014年 | 322篇 |
2013年 | 1139篇 |
2012年 | 290篇 |
2011年 | 356篇 |
2010年 | 325篇 |
2009年 | 346篇 |
2008年 | 326篇 |
2007年 | 295篇 |
2006年 | 310篇 |
2005年 | 296篇 |
2004年 | 294篇 |
2003年 | 269篇 |
2002年 | 278篇 |
2001年 | 490篇 |
2000年 | 449篇 |
1999年 | 304篇 |
1998年 | 201篇 |
1997年 | 152篇 |
1996年 | 131篇 |
1995年 | 126篇 |
1994年 | 153篇 |
1993年 | 136篇 |
1992年 | 199篇 |
1991年 | 224篇 |
1990年 | 208篇 |
1989年 | 221篇 |
1988年 | 209篇 |
1987年 | 192篇 |
1986年 | 238篇 |
1985年 | 207篇 |
1984年 | 162篇 |
1983年 | 175篇 |
1982年 | 115篇 |
1981年 | 121篇 |
1980年 | 86篇 |
1979年 | 132篇 |
1978年 | 76篇 |
1977年 | 74篇 |
1976年 | 71篇 |
1974年 | 77篇 |
1973年 | 67篇 |
1972年 | 69篇 |
1970年 | 47篇 |
排序方式: 共有10000条查询结果,搜索用时 244 毫秒
771.
Thiblin IB Fugelstad AB Leifman AG Romelsjö AP Agren GS Sorimachi Y 《Journal of forensic sciences》2004,49(2):354-360
Isolated death (ID) (i.e., dying alone without anyone noticing for several days) has been suggested to be related to social isolation, mental disorder, and alcohol and/or drug abuse. A major transfer of patients with a mental disorder and/or alcohol and/or drug abuse from institutionalized care to treatment as outpatients has been enacted in Sweden during the past decade. On the basis of the assumption that such deinstitutionalization is likely to result in increased social isolation, our working hypothesis was that the incidence of ID among patients belonging to these categories has increased in Sweden. The present study involved all deaths subjected to a medicolegal examination in Stockholm County (with a population of approximately 1.9 million people) during the period 1992-2000. The pattern of ID (defined as cases involving a postmortem delay between death and discovery of at least 1 week), as well as the incidence of fatalities subjected to medicolegal examination with a record of mental disorder and/or alcohol and/or drug abuse was evaluated. Throughout this period, the proportion of the deceased with a record of a mental disorder was high among all the cases examined and higher still among the cases of ID, especially among those younger than 65 years of age. There was a rather limited increase in the incidence of ID and a much more pronounced increase in the number of former psychiatric patients whose deaths were subjected to medicolegal examination, but did not satisfy the criteria for ID. A record of alcohol and/or drug abuse was more common than a diagnosis of mental disorder among both the males and females who died at an age of less than 65, with a clear difference between the cases of ID and non-ID in the case of men. There was no significant increase in incidence over the course of this study. Thus, this study reveals a slight increase in the number of IDs and a more pronounced increase in the number of medicolegal examination of non-IDs of individuals with a record of a mental disorder. 相似文献
772.
773.
It has recently been reported that purity of illicit tablets of ecstasy (MDMA) is now high. Our objective was to confirm whether hair of drug users, who request only ecstasy from their supplier, contains MDMA in the absence of other drugs. GC-MS analysis of scalp hair segments disclosed the presence of MDMA in 19 of 21 subjects and amphetamine/methamphetamine in eight subjects. Surprisingly, seven subjects had hair levels of the MDMA metabolite, MDA, equal to or greater than those of MDMA, suggesting use of MDA in addition to that of MDMA. These amphetamine derivatives might be included by clandestine laboratories to enhance effects of the drug cocktail or because of a perception that MDA synthesis might be simpler than that of MDMA. Drug users and investigators examining possible brain neurotoxic effects of MDMA need to consider that "ecstasy" tablets can contain MDA and methamphetamine despite no demand for the drugs. 相似文献
774.
775.
776.
Sosenkova LV Sidorov VL Maiatskaia MV Kurdzhieva OB Gurtovaia SV 《Sudebno-meditsinskaia ekspertiza》2004,47(2):29-31
Outlined in the paper are outlooks for determining a group affiliation of sperm in traces, left in material evidence, within forensic biological expertise. A technique is suggested to separate the spermatozoids from the vaginal epithelium cells--it has been used up to now in genetics alone. The method involves the available reagents and does not need any extra training. Its elaboration and introduction would resolve one of the most often-encountered issues set by the investigating office. 相似文献
777.
778.
779.
780.
This study examined effects of clothing cues on children's identification accuracy from lineups. Four- to 14-year-olds (n = 228) saw 12 video clips of individuals, each wearing a distinctly colored shirt. After watching each clip children were presented with a target-present or target-absent photo lineup. Three clothing conditions were included. In 2 conditions all lineup members wore the same colored shirt; in the third, biased condition, the shirt color of only one individual matched that seen in the preceding clip (the target in target-present trials and the replacement in target-absent trials). Correct identifications of the target in target-present trials were most frequent in the biased condition, whereas in target-absent trials the biased condition led to more false identifications of the target replacement. Older children were more accurate than younger children, both in choosing the target from target-present lineups and rejecting target-absent lineups. These findings suggest that a simple clothing cue such as shirt color can have a significant impact on children's lineup identification accuracy. 相似文献