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   7158篇
  免费   230篇
各国政治   405篇
工人农民   223篇
世界政治   582篇
外交国际关系   269篇
法律   4128篇
中国政治   40篇
政治理论   1667篇
综合类   74篇
  2020年   82篇
  2019年   109篇
  2018年   152篇
  2017年   145篇
  2016年   159篇
  2015年   112篇
  2014年   129篇
  2013年   805篇
  2012年   155篇
  2011年   171篇
  2010年   157篇
  2009年   166篇
  2008年   170篇
  2007年   173篇
  2006年   184篇
  2005年   163篇
  2004年   160篇
  2003年   176篇
  2002年   168篇
  2001年   225篇
  2000年   192篇
  1999年   171篇
  1998年   107篇
  1997年   101篇
  1996年   76篇
  1995年   81篇
  1994年   83篇
  1993年   85篇
  1992年   124篇
  1991年   156篇
  1990年   137篇
  1989年   150篇
  1988年   134篇
  1987年   154篇
  1986年   139篇
  1985年   156篇
  1984年   142篇
  1983年   142篇
  1982年   102篇
  1981年   96篇
  1980年   92篇
  1979年   96篇
  1978年   79篇
  1977年   58篇
  1976年   67篇
  1975年   62篇
  1974年   70篇
  1973年   67篇
  1972年   56篇
  1969年   56篇
排序方式: 共有7388条查询结果,搜索用时 15 毫秒
71.
Quadratic pieces of fleece measuring 16 mm2 were soaked with 10 different blood-samples in the dilution steps of 1:1, 1:10, 1:100, 1:1000, respectively, and were tested in blood group typing and identification tests of forensic serology. The above spezified dilutions correspond with 5 microliters, 0.5 microliter, 0.05 microliter and 0.005 microliter of blood, respectively. The detection limit of the microspectrometric test for blood was the dilution 1:10, of the porphyrine test a dilution above 1:100, whereas the preliminary test for blood (peroxidase) succeeded always up to a dilution of 1:1000 and the species determination by the radial immunodiffusion test in agar gels succeeded in most cases op to a dilution of 1:1000. The detection limit of the anti-human globulin inhibition test was between the dilution steps 1:10 and 1:100 when non-titrated and undiluted anti-human globulin serum was used. Gc- and ABO-grouping were possible up to a dilution of 1:100 and were thus the most sensitive grouping systems. Phenotyping of the enzyme-systems and the Gm/Km-system usually required stains with considerably higher blood concentrations i.e. stains of undiluted blood.  相似文献   
72.
The purpose of this study is to review 23 causes of death that have occurred in Western-Austrian prisons from 1974 to 1989. The majority of them (11 cases) were due to suicides. Among 9 cases of natural death there was a 25 years old man, who died of an unknown purulent meningoencephalitis. Two drunken prisoners had not been supervised and therefore died of alcohol poisoning. In one case the police jail physician did not recognize an epidural hematoma.  相似文献   
73.
74.
75.
76.
The authors present a method to separate and preserve stomach contents for forensic purpose. Analysis by "sieve tower" technique is simple and quickly done during autopsy. Solid phases of stomach content are arranged size up and can be stored for subsequent examinations. With the fluid phase drug analysis or microscopic analysis to confirm identy of the foodstuffs may be done. By adding alcohol (70%) enzymatic digestion and bacterial degradation of the stomach content are stopped.  相似文献   
77.
78.
79.
In this article we examine how increasing the reimbursement of physicians and expanding Medicaid eligibility affect access to care for children in Cook County, Illinois, which overlies Chicago. Using Medicaid claims and other data at the zip-code level, we compare the places where Medicaid children live with the places where all the physicians who treat children and those who accept Medicaid patients have their practices. Our findings suggest that the recent changes in legislation are unlikely to benefit extremely poor children, who are more likely to live in depressed inner-city areas, where there are few physicians. "Near-poor" children whose homes are dispersed throughout the county, who are now eligible for Medicaid as a result of the recent changes, are likely to see improvements in their access to care. Further changes in policy, aimed at enhancing the capacity of institutions providing care, could improve access for the children of the inner city.  相似文献   
80.
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