全文获取类型
收费全文 | 12358篇 |
免费 | 456篇 |
专业分类
各国政治 | 610篇 |
工人农民 | 412篇 |
世界政治 | 1053篇 |
外交国际关系 | 621篇 |
法律 | 7140篇 |
中国政治 | 93篇 |
政治理论 | 2789篇 |
综合类 | 96篇 |
出版年
2023年 | 65篇 |
2021年 | 72篇 |
2020年 | 175篇 |
2019年 | 222篇 |
2018年 | 322篇 |
2017年 | 349篇 |
2016年 | 403篇 |
2015年 | 244篇 |
2014年 | 306篇 |
2013年 | 1500篇 |
2012年 | 341篇 |
2011年 | 359篇 |
2010年 | 302篇 |
2009年 | 305篇 |
2008年 | 380篇 |
2007年 | 440篇 |
2006年 | 419篇 |
2005年 | 361篇 |
2004年 | 370篇 |
2003年 | 352篇 |
2002年 | 318篇 |
2001年 | 416篇 |
2000年 | 386篇 |
1999年 | 324篇 |
1998年 | 166篇 |
1997年 | 155篇 |
1996年 | 145篇 |
1995年 | 130篇 |
1994年 | 142篇 |
1993年 | 135篇 |
1992年 | 204篇 |
1991年 | 215篇 |
1990年 | 197篇 |
1989年 | 207篇 |
1988年 | 196篇 |
1987年 | 188篇 |
1986年 | 182篇 |
1985年 | 189篇 |
1984年 | 156篇 |
1983年 | 168篇 |
1982年 | 121篇 |
1981年 | 124篇 |
1980年 | 86篇 |
1979年 | 118篇 |
1978年 | 93篇 |
1977年 | 82篇 |
1976年 | 70篇 |
1975年 | 59篇 |
1974年 | 87篇 |
1973年 | 68篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
121.
J B Kempton A Sirignano D H DeGaetano P J Yates W F Rowe 《Journal of forensic sciences》1992,37(6):1534-1540
The fingernail ridge patterns of a pair of identical twins were compared to each other, their parents, and an unrelated subject. The patterns of the twins' nails showed regions of strong similarity but were distinguishable from one another. Fewer similarities were found when comparing the nails to those of the parents and the unrelated control. The twins were shown to be monozygotic by means of DNA profiling. This therefore represents the first demonstration of unique fingernail ridge patterns in subjects shown conclusively to be identical twins. When the fingernail ridge patterns were examined with a scanning electron microscope, the backscattered electron (BEI) images were found to have superior contrast when compared to the secondary electron (SEI) images. 相似文献
122.
123.
124.
Survival of the public service ethos in Britain has been called into question following introduction of the 'new public management' and marketizing reforms in much of the public sector. This article examines how these developments have occurred in the NHS, using survey data to analyse NHS board members' substantive ethical values. Unexpectedly the results suggest that NHS board members with a predominantly NHS background appear less ethically conservative, more flexible and less risk–averse than those recruited from non–NHS backgrounds; and that as yet the NHS management 'culture' is not very homogenous in respect of 'business ethics'. The NHS reforms also appear to accentuate the tensions between transparent public accountability in NHS management and incentives not to publicize certain types of information. Recent codification of NHS 'business ethics' can be understood as an attempt to buttress the public service ethos against the increased moral strains of a quasi–market. 相似文献
125.
126.
V P Poluianov 《Sudebno-meditsinskaia ekspertiza》1990,33(4):34-36
The analysis of naphthenic acid revealed that they may be used for tin detection in the cadaveric material due to their high complex-forming ability. Method of extraction-atomic absorption tin determination in human organs was developed on the basis of naphthenic acid use. Modified method which differs from the common one by higher sensitivity and selectivity is presented. 相似文献
127.
128.
129.
130.
Restoring accountability in pretrial release: the Philadelphia pretrial release supervision experiments 总被引:1,自引:1,他引:0
As drug arrests and jail overcrowding added pressure to increase pretrial release in localities during the 1980s and 1990s, the need to manage a larger and higher-risk pretrial population of defendants awaiting adjudication in the community became a high priority for justice agencies. In the late 1990s Philadelphia officials sought to discover the ingredients of a successful supervision strategy through four interlinked field experiments to provide an empirical basis for a major reform of the pretrial release system. The results of the linked randomized experiments question common assumptions about “supervision,” its impact and effectiveness, about the underlying nature of the noncompliant defendant, and deterrence implications. The study emphasizes the importance of interpreting the findings in the context of implementation of the policy reform. Findings suggest that facilitative notification strategies wield little influence on defendant behavior and that deterrent aims are undermined by the system's failure to deliver consequences for defendant noncompliance during pretrial release. The most significant contribution of the article is its illustration of a major evidence-based policy reform undertaken by a major court system. 相似文献