全文获取类型
收费全文 | 14003篇 |
免费 | 391篇 |
专业分类
各国政治 | 654篇 |
工人农民 | 509篇 |
世界政治 | 1020篇 |
外交国际关系 | 487篇 |
法律 | 8153篇 |
中国共产党 | 1篇 |
中国政治 | 82篇 |
政治理论 | 3358篇 |
综合类 | 130篇 |
出版年
2020年 | 152篇 |
2019年 | 204篇 |
2018年 | 257篇 |
2017年 | 294篇 |
2016年 | 316篇 |
2015年 | 221篇 |
2014年 | 259篇 |
2013年 | 1516篇 |
2012年 | 289篇 |
2011年 | 358篇 |
2010年 | 303篇 |
2009年 | 352篇 |
2008年 | 377篇 |
2007年 | 379篇 |
2006年 | 357篇 |
2005年 | 336篇 |
2004年 | 335篇 |
2003年 | 349篇 |
2002年 | 386篇 |
2001年 | 507篇 |
2000年 | 445篇 |
1999年 | 379篇 |
1998年 | 220篇 |
1997年 | 199篇 |
1996年 | 194篇 |
1995年 | 179篇 |
1994年 | 172篇 |
1993年 | 178篇 |
1992年 | 284篇 |
1991年 | 305篇 |
1990年 | 279篇 |
1989年 | 301篇 |
1988年 | 268篇 |
1987年 | 267篇 |
1986年 | 314篇 |
1985年 | 301篇 |
1984年 | 258篇 |
1983年 | 268篇 |
1982年 | 188篇 |
1981年 | 160篇 |
1980年 | 136篇 |
1979年 | 174篇 |
1978年 | 109篇 |
1977年 | 132篇 |
1976年 | 120篇 |
1975年 | 88篇 |
1974年 | 115篇 |
1973年 | 95篇 |
1972年 | 90篇 |
1971年 | 81篇 |
排序方式: 共有10000条查询结果,搜索用时 375 毫秒
41.
The remains of an unidentified female neonate were discovered in a field in central Missouri. Examination revealed bilateral absence of the parietal bones. A search of the literature describing similar defects suggests that the present case represents a unique condition, described here for the first time. 相似文献
42.
43.
44.
45.
46.
This study examines the performance of chief federal prosecutors(U.S. attorneys) and their subsequent careers. In a sample of570 attorneys in office from 1969 to 2000, the length of prisonsentences is positively related to subsequent favorable careeroutcomes for U.S. attorneys. In contrast, conviction rates donot appear to affect the careers of U.S. attorneys. These resultsare consistent with longer total prison sentences beingpersonally beneficial to prosecutors, and prosecutorsmaximizing the length of prison sentences. Overall, the resultssuggest that sentence length, as opposed to convictions rates,is the relevant performance metric. 相似文献
47.
48.
49.
Isolation of the DNA minisatellite probe MZ 1.3 and its application to DNA 'fingerprinting' analysis 总被引:1,自引:0,他引:1
U Schacker P M Schneider B Holtkamp E Bohnke R Fimmers H H Sonneborn C Rittner 《Forensic science international》1990,44(2-3):209-224
A minisatellite probe, MZ 1.3, detecting hypervariable fragment patterns was isolated from a human genomic library. A repetitive sequence of 27 bp length was identified which is contained in the probe approx. 40 times. The MZ 1.3 repeat shows variable homology of 53-73% to the repetitive sequence of the protein III gene of the bacteriophage M13 genome. Polymorphic restriction fragment patterns were found with MZ 1.3 using the enzymes Hinf I, BstN I, Hae III, Mbo I, PstI/Pvu II, and Rsa I. An average of 18 polymorphic fragments was observed using Hinf I as enzyme. The band sharing frequency after Hinf I digestion among unrelated individuals was determined to be 23.8 +/- 7.2%. An example for the application of MZ 1.3 to paternity testing in an incest case is given. The probe can be used with radioactive or non-radioactive detection systems. An approach is presented to compare polymorphic fragment patterns from individuals obtained by independent gel runs on the basis of relative band positions (RBP) and calculated in a computerized analysis. 相似文献
50.
JAMES R. ACKER 《Law & policy》1990,12(1):1-23
The Supreme Court early took note of extralegal, “social science” materials in Muller v. Oregon (1908), and a half-century later made specific reference to social science authorities in the famous footnote 11 of Brown v. Board of Education (1954). Since Brown, much has been written about the Supreme Court's use of social science research evidence, but there has been little systematic study of that use. Those writing on the subject commonly focus on areas of law such as jury size, where social science has been used, and have generally assumed that social science information has been utilized in Supreme Court decisions with increasing regularity. Surprisingly little is known, however, about either the justices' baseline use of social science authorities, or many other aspects of their uses of social science information. The focus here is on the citation of social science research evidence in a sample of 240 criminal cases decided during the 30 years between the Supreme Court's 1958 and 1987 Terms. The resulting portrait contributes to a fuller understanding of the justices' use of social science materials, and may ultimately help promote more effective utilization of social science research evidence in Supreme Court decisions. 相似文献