全文获取类型
收费全文 | 14878篇 |
免费 | 1300篇 |
专业分类
各国政治 | 613篇 |
工人农民 | 467篇 |
世界政治 | 1151篇 |
外交国际关系 | 536篇 |
法律 | 10212篇 |
中国共产党 | 3篇 |
中国政治 | 119篇 |
政治理论 | 2964篇 |
综合类 | 113篇 |
出版年
2021年 | 70篇 |
2020年 | 378篇 |
2019年 | 394篇 |
2018年 | 478篇 |
2017年 | 542篇 |
2016年 | 560篇 |
2015年 | 491篇 |
2014年 | 500篇 |
2013年 | 1718篇 |
2012年 | 339篇 |
2011年 | 451篇 |
2010年 | 605篇 |
2009年 | 559篇 |
2008年 | 367篇 |
2007年 | 336篇 |
2006年 | 459篇 |
2005年 | 347篇 |
2004年 | 326篇 |
2003年 | 314篇 |
2002年 | 305篇 |
2001年 | 508篇 |
2000年 | 415篇 |
1999年 | 349篇 |
1998年 | 198篇 |
1997年 | 184篇 |
1996年 | 139篇 |
1995年 | 174篇 |
1994年 | 182篇 |
1993年 | 164篇 |
1992年 | 251篇 |
1991年 | 283篇 |
1990年 | 249篇 |
1989年 | 273篇 |
1988年 | 234篇 |
1987年 | 209篇 |
1986年 | 245篇 |
1985年 | 262篇 |
1984年 | 246篇 |
1983年 | 224篇 |
1982年 | 184篇 |
1981年 | 178篇 |
1980年 | 164篇 |
1979年 | 185篇 |
1978年 | 122篇 |
1977年 | 97篇 |
1976年 | 98篇 |
1975年 | 86篇 |
1974年 | 95篇 |
1973年 | 79篇 |
1971年 | 67篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
James C. Spilsbury Lara Belliston Dennis Drotar Allyson Drinkard Jeff Kretschmar Rosemary Creeden Daniel J. Flannery Steve Friedman 《Journal of family violence》2007,22(6):487-499
This study assessed the associations of characteristics of domestic violence incidents with clinically significant levels
of traumatic symptoms and behavioral problems in a socio-economically and ethnically mixed sample of 687 children participating
in a community-service program for children witnessing violence. Study predictors included child/family demographic characteristics,
type and chronicity of exposure, and child’s perceptions of control over the event and threat to personal safety. Outcomes
consisted of traumatic symptoms and behavior problems. Results showed that perceived threat and control were associated with
greater odds of clinically significant levels of several trauma symptoms (and behavior problems in the case of perceived threat)
after adjusting for effects of demographic factors and violence characteristics. Child co-victimization increased odds of
reaching clinically significant levels of traumatic symptoms compared to children who witnessed the event but were not victimized.
Female sex and White ethnicity increased odds of specific trauma symptoms and behavior problems. Increasing age reduced odds
of some trauma symptoms. Associations between predictors and one outcome measure did not generalize across the other outcome
measure. Implications of study findings, and directions for future research are discussed. 相似文献
992.
993.
994.
M D Bell L G Tate R K Wright 《The American journal of forensic medicine and pathology》1991,12(1):77-79
We present an accidental autoerotic asphyxiation of a 24-year-old man. Further investigation revealed that 18 years earlier, his brother, then 13, had been found dead, hanging in the family bathroom. Although that death had been ruled a suicide, reevaluation of the death scene indicates that this was also an autoerotic asphyxiation. This is the first reported case of sexual asphyxia involving siblings. 相似文献
995.
996.
997.
998.
999.
1000.
The azygos vein ascends along the thoracic spine through the mediastinum and drains into the superior vena cava at the level of the fourth thoracic vertebra. Fracture-dislocation of the mid-thoracic spine, as a result of blunt thoracic trauma, can tear the azygos vein. Four such fatal cases (three motor vehicle accidents and one fall) were studied, only one of which was recognized prior to death. The vein can also be torn, in the absence of skeletal injuries, by horizontal acceleration/deceleration forces. The pathologist must consider azygos vein laceration as a possible cause of either hemothorax or hemomediastinum or both in a victim of a blunt chest trauma, if that individual had persistent hypotension during the few hours before death and no identifiable source of hemorrhage can be found postmortem in sites such as the heart, great vessels, lung, and chest wall. A fracture-dislocation of the thoracic spine may not necessarily be present. Azygos vein laceration seems to be an uncommon cause of hemothorax and hemomediastinum; however, this injury is probably more frequent than is implied by the few cases described in the medical literature. 相似文献