全文获取类型
收费全文 | 13544篇 |
免费 | 620篇 |
专业分类
各国政治 | 669篇 |
工人农民 | 429篇 |
世界政治 | 989篇 |
外交国际关系 | 473篇 |
法律 | 8645篇 |
中国政治 | 69篇 |
政治理论 | 2787篇 |
综合类 | 103篇 |
出版年
2020年 | 221篇 |
2019年 | 262篇 |
2018年 | 314篇 |
2017年 | 316篇 |
2016年 | 334篇 |
2015年 | 291篇 |
2014年 | 278篇 |
2013年 | 1453篇 |
2012年 | 285篇 |
2011年 | 324篇 |
2010年 | 338篇 |
2009年 | 355篇 |
2008年 | 319篇 |
2007年 | 308篇 |
2006年 | 333篇 |
2005年 | 300篇 |
2004年 | 312篇 |
2003年 | 307篇 |
2002年 | 281篇 |
2001年 | 492篇 |
2000年 | 416篇 |
1999年 | 368篇 |
1998年 | 195篇 |
1997年 | 164篇 |
1996年 | 139篇 |
1995年 | 154篇 |
1994年 | 160篇 |
1993年 | 167篇 |
1992年 | 261篇 |
1991年 | 298篇 |
1990年 | 266篇 |
1989年 | 294篇 |
1988年 | 241篇 |
1987年 | 284篇 |
1986年 | 265篇 |
1985年 | 278篇 |
1984年 | 238篇 |
1983年 | 249篇 |
1982年 | 180篇 |
1981年 | 172篇 |
1980年 | 147篇 |
1979年 | 191篇 |
1978年 | 137篇 |
1977年 | 116篇 |
1976年 | 113篇 |
1975年 | 108篇 |
1974年 | 120篇 |
1973年 | 116篇 |
1972年 | 98篇 |
1969年 | 88篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
32.
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
33.
34.
D J WILLIAMS WILLIAM B. STREAN ENRIQUE GARCIA BENGOECHEA 《Juvenile & family court journal》2002,53(2):31-41
This article discusses relevant literature on the potential benefits of sport, recreation, and leisure, and how these benefits relate to rehabilitation of juveniles. Many professionals involved in juvenile rehabilitation believe sport and recreation are beneficial adjuncts to treatment programming; however, it can be difficult to structure sport and recreation in ways that directly correspond to treatment goals. The purpose of this article is to provide insights for professionals working with juveniles on how sport and recreation programming can be an effective means of helping to achieve rehabilitation goals. Attention is given to approaches, particularly the Teaching Games for Understanding model (Bunker & Thorpe, 1982), which can be used to effectively link recreation and sport to the rehabilitation process. 相似文献
35.
This article outlines the new regionalism movement and its metropolitanagenda, reviews federal efforts to promote new regionalism underISTEA and TEA21, considers how the new federal policieschanged the role of metropolitan planning organizations (MPOs)in transportation planning by examining the MPO for the Louisvillemetropolis, and assesses the MPO process in Louisville. Thelocal decision of whether to build a new bridge across the OhioRiver was a major test of the enhanced MPO process. Federaltransportation policies enhanced regional coordination and cooperationin transportation planning in the Louisville metropolis resultingin a consensus plan to build two bridges across the Ohio River.However, the MPO process did not lead to the development ofa metropolitan-wide interest or perspective. Moreover, the newregionalist agenda was not advanced because sprawl was not afactor in the decision on whether and where to build the bridges. 相似文献
36.
37.
The enzyme activity of phosphoglucomutase (PGM) has been investigated in red cell haemolysates from 142 individuals and compared to the sub-type as determined by isoelectric focusing. The 10 phenotypes showed significant differences in PGM-activity which indicates that there is a correlation between the level of activity and the isolelectric point of homozygotes. No indication of silent alleles or alleles with reduced activity was found in this collective. 相似文献
38.
Correlation between plasma and bone marrow tricyclic antidepressants has not been studied before. Two groups of rabbits were given 10 and 20 mg of desipramine/kg body weight, respectively. Desipramine was administered to the animals once daily by mouth for 5 days. On the fifth day the animals were sacrificed and blood and bone marrow samples were collected and analyzed using a high performance liquid chromatographic (HPLC) method. Data showed that a correlation exists between bone marrow and blood desipramine. The bone marrow desipramine concentration increased as its blood levels increased. The average ratio of bone marrow to blood desipramine +/- S.D. (standard deviation) in both dosage groups was 37.2 +/- 4.46 with a range of 30.99-44.82. This investigation is promising and shows that bone marrow could be used as an alternative tissue in the absence of a suitable blood sample. 相似文献
39.
Bone fragments were stored in water for 2 years at room temperature and investigated serologically using the following methods: Absorption-elution, extraction of blood group substances and immunohistochemistry (PAP). All 3 methods gave essentially specific results for fresh bone tissue but with putrid bone tissue unspecific reactions were found predominantly with the absorption-elution and PAP techniques. In contrast, more specific reactions were obtained from the extracts although they were much weaker. From this it can be concluded that pure physical binding plays a substantial role in the unspecific reaction between antibodies and bone material. It is suggested that the relevant physical properties are altered by putrification. 相似文献
40.
W D Haglund D G Reichert D T Reay 《The American journal of forensic medicine and pathology》1990,11(1):35-43
The Green River Murder Investigation in King County, Washington, is currently the longest active serial murder investigation in U.S. history. During its course, over 26 separate scenes with from one to five victims each have been processed. The experience of the authors is presented in order to acquaint other agencies with techniques of outdoor scene processing that have evolved during recovery of remains from Green River and other skeletal cases. 相似文献