全文获取类型
收费全文 | 3604篇 |
免费 | 98篇 |
专业分类
各国政治 | 254篇 |
工人农民 | 148篇 |
世界政治 | 322篇 |
外交国际关系 | 197篇 |
法律 | 1524篇 |
中国政治 | 16篇 |
政治理论 | 1198篇 |
综合类 | 43篇 |
出版年
2020年 | 48篇 |
2019年 | 51篇 |
2018年 | 73篇 |
2017年 | 79篇 |
2016年 | 104篇 |
2015年 | 59篇 |
2014年 | 85篇 |
2013年 | 603篇 |
2012年 | 75篇 |
2011年 | 98篇 |
2010年 | 94篇 |
2009年 | 91篇 |
2008年 | 108篇 |
2007年 | 120篇 |
2006年 | 102篇 |
2005年 | 98篇 |
2004年 | 103篇 |
2003年 | 110篇 |
2002年 | 157篇 |
2001年 | 82篇 |
2000年 | 79篇 |
1999年 | 84篇 |
1998年 | 64篇 |
1997年 | 79篇 |
1996年 | 57篇 |
1995年 | 47篇 |
1994年 | 39篇 |
1993年 | 49篇 |
1992年 | 54篇 |
1991年 | 59篇 |
1990年 | 42篇 |
1989年 | 56篇 |
1988年 | 48篇 |
1987年 | 43篇 |
1986年 | 56篇 |
1985年 | 48篇 |
1984年 | 30篇 |
1983年 | 57篇 |
1982年 | 43篇 |
1981年 | 33篇 |
1980年 | 28篇 |
1979年 | 26篇 |
1978年 | 26篇 |
1977年 | 22篇 |
1976年 | 29篇 |
1975年 | 20篇 |
1974年 | 28篇 |
1973年 | 16篇 |
1972年 | 13篇 |
1971年 | 16篇 |
排序方式: 共有3702条查询结果,搜索用时 15 毫秒
941.
942.
This paper challenges the claim of the public administration community that universities are playing an important role in transferring public sector technology to local governments. We provide data from the Lower Mississippi Delta to show that graduate programs in public management and planning are not filling the severe expertise gap facing nonrnetropolitan counties and municipalities. The paper concludes with a series of recommendations on how universities can better fulfill their promise of technology transfer. 相似文献
943.
Sixteen trace elements found in 309 street heroin samples, piped water and contaminated water were determined using inductively coupled plasma-mass spectrometry. All the street heroin samples were found to contain high levels of sodium, a reflection of the use of sodium bicarbonate during heroin synthesis. Additionally, this element was also found to be one of the potential contaminants acquired from the piped water. Calcium could be derived from lime while iron, aluminum and zinc could have come from the metallic container used in the processing/cutting stage. The levels of these elements remained low in the heroin and it could be due to the dilution effects from the addition of adulterants. Statistical validation was performed with six links of related heroin samples using principal component analysis to find the best pretreatment for sample classification. It was obtained that normalization followed by fourth root showed promising results with 8% errors in the sample clustering. The technique was then applied to the case samples. Finally, the result suggested that the case samples could have originated from at least two major groups respectively showing unique elemental profiles at the street level. 相似文献
944.
945.
946.
947.
948.
949.
950.