全文获取类型
收费全文 | 8477篇 |
免费 | 247篇 |
专业分类
各国政治 | 584篇 |
工人农民 | 243篇 |
世界政治 | 607篇 |
外交国际关系 | 326篇 |
法律 | 5078篇 |
中国共产党 | 7篇 |
中国政治 | 47篇 |
政治理论 | 1758篇 |
综合类 | 74篇 |
出版年
2020年 | 112篇 |
2019年 | 139篇 |
2018年 | 242篇 |
2017年 | 221篇 |
2016年 | 247篇 |
2015年 | 189篇 |
2014年 | 161篇 |
2013年 | 878篇 |
2012年 | 207篇 |
2011年 | 218篇 |
2010年 | 203篇 |
2009年 | 226篇 |
2008年 | 259篇 |
2007年 | 283篇 |
2006年 | 315篇 |
2005年 | 220篇 |
2004年 | 210篇 |
2003年 | 206篇 |
2002年 | 217篇 |
2001年 | 256篇 |
2000年 | 217篇 |
1999年 | 178篇 |
1998年 | 110篇 |
1997年 | 99篇 |
1996年 | 75篇 |
1995年 | 80篇 |
1994年 | 82篇 |
1993年 | 82篇 |
1992年 | 123篇 |
1991年 | 159篇 |
1990年 | 136篇 |
1989年 | 152篇 |
1988年 | 136篇 |
1987年 | 156篇 |
1986年 | 146篇 |
1985年 | 156篇 |
1984年 | 137篇 |
1983年 | 143篇 |
1982年 | 102篇 |
1981年 | 102篇 |
1980年 | 90篇 |
1979年 | 99篇 |
1978年 | 80篇 |
1977年 | 60篇 |
1976年 | 66篇 |
1975年 | 62篇 |
1974年 | 71篇 |
1973年 | 70篇 |
1972年 | 57篇 |
1969年 | 57篇 |
排序方式: 共有8724条查询结果,搜索用时 15 毫秒
991.
This paper reports the case of a 22-year-old white male who was found dead in a storage room as a result of a fatal ingestion of cyclopropane. Cyclopropane is a sweet-smelling, irritating gas. Autopsy findings revealed congestion and hemorrhagic edema of the lungs, congestion of the trachea, and early autolysis. Cyclopropane was determined by headspace gas chromatography and mass spectrometry. To our knowledge, this is the first reported fatality involving cyclopropane. 相似文献
992.
993.
A group of four illegal aliens had been without food for several days when they found a group of wild mushrooms growing in a field in Southern California. Each man consumed a meal of one to six fried mushrooms. Two days after eating the mushrooms, all four men developed abdominal pain, nausea, diarrhea, and intractable vomiting. Three days after consuming the mushrooms, all four were hospitalized and their clinical courses rapidly deteriorated to refractory hepatorenal failure and coma. Three of the victims died three days after admission to the hospital and the fourth died eight days after admission. The autopsy findings are presented and the mechanism of Amanita phalloides mushroom poisoning is discussed. 相似文献
994.
995.
This study examines the association between parents' violence toward children and their involuntary participation in family work. Involuntary participation in family work is conceptualized as a form of role strain measured by the disparity between the amount of responsibility husbands and wives would prefer to assume in the home and the amount of family work they actually perform. The prediction guiding this research is that differences of this kind are more associated with mothers' violence than fathers'. Regression analysis with a national sample of parents supports this hypothesis. Nonetheless, the association between such role strain and violence is quite weak, suggesting that additional research is required in formulating and measuring this relationship. 相似文献
996.
997.
998.
999.
1000.