首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   13045篇
  免费   663篇
各国政治   584篇
工人农民   441篇
世界政治   1027篇
外交国际关系   477篇
法律   8180篇
中国共产党   1篇
中国政治   91篇
政治理论   2819篇
综合类   88篇
  2021年   87篇
  2020年   225篇
  2019年   294篇
  2018年   309篇
  2017年   378篇
  2016年   380篇
  2015年   314篇
  2014年   363篇
  2013年   1362篇
  2012年   331篇
  2011年   374篇
  2010年   356篇
  2009年   379篇
  2008年   368篇
  2007年   356篇
  2006年   358篇
  2005年   328篇
  2004年   333篇
  2003年   316篇
  2002年   311篇
  2001年   510篇
  2000年   471篇
  1999年   337篇
  1998年   215篇
  1997年   182篇
  1996年   158篇
  1995年   152篇
  1994年   183篇
  1993年   171篇
  1992年   228篇
  1991年   243篇
  1990年   222篇
  1989年   244篇
  1988年   225篇
  1987年   215篇
  1986年   255篇
  1985年   238篇
  1984年   195篇
  1983年   200篇
  1982年   144篇
  1981年   147篇
  1980年   106篇
  1979年   144篇
  1978年   89篇
  1977年   84篇
  1976年   79篇
  1975年   54篇
  1974年   84篇
  1973年   83篇
  1972年   70篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
951.
Allele frequency data and forensic efficiency parameters for 10 STR loci: D3S1358, vWA, D16S539, D2S1338, D8S1179, D21S11, D18S51, D19S433, TH01 and FGA, were estimated from a sample of 207 unrelated individuals in Lodz region of Poland.  相似文献   
952.
953.
954.
Blowfly larvae found on human corpses are important for the estimation of the postmortem interval (PMI) and other questions of forensic relevance. Some of these species are difficult to differentiate morphologically, therefore a molecular method was elaborated for species identification. Specific fragments of the COI and COII region of the mitochondrial DNA (mtDNA) were amplified followed by digestion with different restriction enzymes. Using a 1.3 kb fragment, identification of Lucilia sericata, Calliphora vicina and Calliphora vomitoria was possible by digestion with only one restriction enzyme using either DraI or HinfI. Furthermore, we sequenced 349 bp (a part of the COI and COII regions) from the same three species and found 34 nucleotide distinctions between C. vicina and L. sericata, 30 between C. vomitoria and L. sericata and 15 between the two Calliphora species. These results aid in quick identification of species used for estimation of PMI.  相似文献   
955.
Until recently, physicians were viewed as the dominant player in health policy. Now, however, they compete with many other effective interest groups. This article analyzes this changing role, and specifically how organized medicine has changed its approach to influencing health policy. The essay begins with a review of the reasons for the growth and subsequent decline of physicians' influence. This is followed by a case study of physician payment reform under Medicare, which illustrates the ways in which organized medicine chooses when and when not to cooperate with government. The article concludes with a discussion of where physicians are likely to continue to be influential in future health policy reform. Three such areas are noted: payment policy, quality and clinical innovation, and medical education and training.  相似文献   
956.
The past decade provides a useful window through which to examine whether states are likely to provide health care leadership. During this era, states were given increased discretion to set health care policy, they had the financial resources to encourage innovation, and their administrative capacity was at its strongest ever. Despite the favorable conditions, however, states were reluctant to spend their own funds on programs for the uninsured, their efforts to make private insurance more affordable for the small business community were disappointing, and their efforts to regulate the managed care industry fell short. At the same time, though, the most promising innovations over the past decade were in programs financed primarily with federal dollars, administered primarily by state officials, and advanced by an intergovernmental partnership in which administrators at different levels of government prod each other to try and do more. This sort of intergovernmental partnership provides the best model for innovative health policy leadership.  相似文献   
957.
Nineteen Y-chromosomal short tandem repeats (STRs), DYS19, DYS389-I, DYS389-II, DYS390, DYS391, DYS392, DYS393, DYS385, DYS388, DYS434, DYS435, DYS436, DYS437, DYS438, DYS439, DYS460, DYS461 and DYS462 were typed in Inuit (n=70) and Danish (n=62) population samples.  相似文献   
958.
Gunshot wounds in suicide cases are self-inflicted wounds. Self-inflicted wounds in suicide cases are usually caused by contact firing and are of great forensic significance. Evaluation of contact wound may be associated with difficulties if the bore gets obstruction prior to firing. This paper investigates the phenomenon and interprets the results of test firing conducted on 20% gelatine block at 10 degrees C, using .38 Special revolver with obstruction of a bullet in the bore. Test firings were conducted in three different muzzle-target contact conditions keeping the muzzle pressed against the gel block in each case. The physical evidence and the wound ballistic parameter namely bullet track, remaining velocity of the bullets and volume of permanent cavity have been studied. When compared with the results of contact firing conducted with the same firearm without having any bore obstruction under similar conditions, it has been found that the physical evidence and the wound ballistic parameters would be helpful for interpretation of such unusual incidents for forensic inference.  相似文献   
959.
960.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号