全文获取类型
收费全文 | 779篇 |
免费 | 31篇 |
专业分类
各国政治 | 34篇 |
工人农民 | 63篇 |
世界政治 | 53篇 |
外交国际关系 | 43篇 |
法律 | 378篇 |
中国政治 | 7篇 |
政治理论 | 215篇 |
综合类 | 17篇 |
出版年
2022年 | 3篇 |
2021年 | 7篇 |
2020年 | 12篇 |
2019年 | 14篇 |
2018年 | 22篇 |
2017年 | 34篇 |
2016年 | 31篇 |
2015年 | 18篇 |
2014年 | 34篇 |
2013年 | 131篇 |
2012年 | 22篇 |
2011年 | 30篇 |
2010年 | 17篇 |
2009年 | 13篇 |
2008年 | 23篇 |
2007年 | 33篇 |
2006年 | 27篇 |
2005年 | 21篇 |
2004年 | 25篇 |
2003年 | 22篇 |
2002年 | 12篇 |
2001年 | 10篇 |
2000年 | 19篇 |
1999年 | 11篇 |
1998年 | 8篇 |
1997年 | 10篇 |
1996年 | 7篇 |
1995年 | 9篇 |
1994年 | 9篇 |
1993年 | 8篇 |
1992年 | 5篇 |
1991年 | 11篇 |
1990年 | 8篇 |
1989年 | 11篇 |
1988年 | 10篇 |
1987年 | 4篇 |
1986年 | 6篇 |
1985年 | 9篇 |
1984年 | 10篇 |
1983年 | 9篇 |
1982年 | 9篇 |
1981年 | 12篇 |
1980年 | 11篇 |
1979年 | 9篇 |
1978年 | 5篇 |
1977年 | 6篇 |
1976年 | 6篇 |
1973年 | 4篇 |
1972年 | 3篇 |
1971年 | 3篇 |
排序方式: 共有810条查询结果,搜索用时 15 毫秒
81.
High performance liquid chromatographic-immunoassay (HPLC-IA) profiles of cannabinoid metabolites in urine samples were obtained using four different antisera. The urines were chromatographed on a reverse phase system using a gradient of acetonitrile in water (pH 3.3) and fractions collected every 30 s. Some urine samples were hydrolyzed with methanolic sodium hydroxide before fractionation. Peaks of immunoreactivity were detected at a fraction corresponding to 11-nor-9-carboxy-delta 9-tetrahydrocannabinol (COOH-THC) and at an early eluting fraction; however, the profiles depended upon the specificity of the antisera used. 相似文献
82.
83.
Sandra H. Johnson 《The Journal of law, medicine & ethics》1995,23(3):266-272
84.
The research reported here was a survey study exploring attitudes toward hate crime laws and possible causes of such attitudes. In a path model, which was supported by the data, it was found that the major factor determining acceptance or rejection of a hate crime law was whether or not homosexuals would be included as a protected group: those wanting inclusion supporting such a law, and those not wanting inclusion opposing such a law. Consistent with identity politics theory, the data-supported model further found that both social and economic liberals, and people who thought hate crimes created fear in other members of the victim's group, wanted homosexuals included in hate crime laws. Other findings, however, were inconsistent with the identity politics theory position that this movement was a united front. Other results from the data-supported model are also discussed and explanations are provided. 相似文献
85.
Papillary hyperplasia of the lingual tonsils is a rare entity not previously reported at autopsy. We report a case that occurred in a 19-year-old man who died suddenly from his epilepsy, associated with aspiration of gastric contents. We describe the pathological features of this unusual condition, discuss the possible significance in this case and stress the importance of routine examination of the tongue and pharynx in every autopsy. 相似文献
86.
87.
88.
89.
90.