全文获取类型
收费全文 | 9215篇 |
免费 | 288篇 |
专业分类
各国政治 | 647篇 |
工人农民 | 257篇 |
世界政治 | 696篇 |
外交国际关系 | 400篇 |
法律 | 5392篇 |
中国共产党 | 7篇 |
中国政治 | 55篇 |
政治理论 | 1970篇 |
综合类 | 79篇 |
出版年
2021年 | 61篇 |
2020年 | 130篇 |
2019年 | 156篇 |
2018年 | 272篇 |
2017年 | 254篇 |
2016年 | 277篇 |
2015年 | 209篇 |
2014年 | 190篇 |
2013年 | 1007篇 |
2012年 | 224篇 |
2011年 | 244篇 |
2010年 | 221篇 |
2009年 | 252篇 |
2008年 | 285篇 |
2007年 | 326篇 |
2006年 | 352篇 |
2005年 | 236篇 |
2004年 | 232篇 |
2003年 | 230篇 |
2002年 | 236篇 |
2001年 | 270篇 |
2000年 | 232篇 |
1999年 | 193篇 |
1998年 | 123篇 |
1997年 | 114篇 |
1996年 | 81篇 |
1995年 | 91篇 |
1994年 | 85篇 |
1993年 | 90篇 |
1992年 | 138篇 |
1991年 | 168篇 |
1990年 | 140篇 |
1989年 | 154篇 |
1988年 | 137篇 |
1987年 | 157篇 |
1986年 | 148篇 |
1985年 | 161篇 |
1984年 | 140篇 |
1983年 | 147篇 |
1982年 | 104篇 |
1981年 | 104篇 |
1980年 | 95篇 |
1979年 | 102篇 |
1978年 | 84篇 |
1977年 | 64篇 |
1976年 | 67篇 |
1975年 | 64篇 |
1974年 | 73篇 |
1973年 | 72篇 |
1969年 | 61篇 |
排序方式: 共有9503条查询结果,搜索用时 15 毫秒
861.
OVG Münster 《Natur und Recht》2008,30(12):869-872
Ohne Zusammenfassung 相似文献
862.
We present strong evidence that governing coalitions in Italy exercise significant negative agenda powers. First, governing parties have a roll rate that is nearly 0, and their roll rate is lower than opposition parties' roll rates, which average about 20% on all final‐passage votes. Second, after one controls for distance from the floor median, opposition parties have higher roll rates than government parties. These results strongly suggest that governing parties in Italy are able to control the legislative agenda to their benefit. We also document significantly higher opposition roll rates on decree‐conversion bills and budget bills than on ordinary bills—results consistent with our theoretical analysis of the differing procedures used in each case. 相似文献
863.
864.
P.M. Vallone M.C. Kline D.L. Duewer A.E. Decker J.W. Redman J.C. Travis M.V. Smith J.M. Butler 《Forensic Science International: Genetics Supplement Series》2008,1(1):80-82
National Institute of Standards and Technology SRM 2372 human DNA quantitation standard has been produced to support the need for a human-specific DNA quantitation standard in forensic casework and calibration of new quantitative polymerase chain reaction (qPCR) assays. The conventional DNA concentration has been assigned with one of the U.S. National Reference UV/Visible Spectrophotometers, assuming an absorbance of 1.0 at 260 nm equals 50 ng/μL of double stranded DNA. In addition, an interlaboratory study has been conducted, to verify that the SRM 2372 materials perform well in currently used DNA quantitation assays by the forensic DNA community. Each unit of SRM 2372 consists of three well-characterized DNA extracts. Component A is a single-source human male material derived from blood. Component B is a multiple-source human female material derived from blood. Component C was purchased as a purified unsheared genomic human DNA (Sigma-Aldrich Co., St. Louis, MO) obtained as a lyophilized human genomic extract and has both male and female donors. SRM 2372 is intended to enable the comparison of DNA concentration measurements across time and place. Manufacturers can use SRM 2372 to validate the values assigned to their own reference materials. Individual forensic laboratories can use SRM 2372 to validate DNA quantitation methods and to verify the assigned concentration of in-house or commercial DNA calibration standards. 相似文献
865.
866.
867.
868.
869.
870.