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   12013篇
  免费   331篇
各国政治   564篇
工人农民   436篇
世界政治   968篇
外交国际关系   437篇
法律   7252篇
中国政治   86篇
政治理论   2520篇
综合类   81篇
  2020年   138篇
  2019年   197篇
  2018年   272篇
  2017年   245篇
  2016年   248篇
  2015年   164篇
  2014年   223篇
  2013年   1286篇
  2012年   273篇
  2011年   300篇
  2010年   262篇
  2009年   279篇
  2008年   321篇
  2007年   304篇
  2006年   303篇
  2005年   264篇
  2004年   291篇
  2003年   272篇
  2002年   244篇
  2001年   496篇
  2000年   430篇
  1999年   338篇
  1998年   171篇
  1997年   167篇
  1996年   119篇
  1995年   124篇
  1994年   118篇
  1993年   119篇
  1992年   230篇
  1991年   281篇
  1990年   248篇
  1989年   258篇
  1988年   233篇
  1987年   263篇
  1986年   235篇
  1985年   236篇
  1984年   225篇
  1983年   215篇
  1982年   154篇
  1981年   157篇
  1980年   120篇
  1979年   161篇
  1978年   114篇
  1977年   82篇
  1976年   88篇
  1975年   93篇
  1974年   110篇
  1973年   118篇
  1972年   91篇
  1969年   74篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
992.
993.
In rats, fibrinolytic activity and acidosis increased rapidly after death. Postmortem fibrinolysis and the pH, base excess (BE), and [HCO3-] levels were affected by the method of sacrifice: the lower the pH, BE, and [HCO3-] levels, the higher the fibrinolytic activity. Conversely, in experiments using the vascular perfusion technique, low pH, BE, and [HCO3-] levels of the perfusate induced abundant release of plasminogen activator from the vascular wall.  相似文献   
994.
995.
996.
Chloroquine concentrations in blood and tissues were examined in overdose and non-overdose cases to determine appropriate ranges for interpretation. Twenty-nine literature overdose cases and 8 non-overdose literature cases were compared with this laboratory's findings. The results indicate significant postmortem redistribution of chloroquine. Combining this laboratory's results and the literature results indicates that using a liver concentration of 150 mg/kg as a cutoff between overdose and non-overdose concentrations properly identified 30 of the 34 published cases containing liver chloroquine and 19 of the 20 presented cases.  相似文献   
997.
998.
One December morning the naked bodies of two alcoholics were found on an open place in the center of the city of Essen. The phenomenon of paradoxical undressing due to vital hypothermia is described and the significant influence of alcohol on hypothermia and confusion in connection with hypothermia is pointed out. Compared to the results of other authors, external and internal signs of lethal hypothermia were analysed in a retrospective series of 30 cases (autopsy material in the region of Essen, investigation period from 1979-1989).  相似文献   
999.
Theory based on sex role traditionalism predicts a more punishing decision for female than for male offenders, while theory based on chivalry (paternalism) predicts greater leniency by the courts for female offenders. This paper tests these two models using a large sample (36,680) of juvenile court referrals in metropolitan, urban, and rural locations spanning a nine-year period. Nonparametric analysis of covariance is used to control for differences in offense, previous contact with the court system, and other background variables. Evidence of gender bias in dispositions was found. The patterns of bias across time, location, offense committed, and previous referral to the court system supports the persistence of chivalry and a decline in sex role traditionalism in court decisions. Greater punishment for girls than boys was found only for repeat offenders committing more serious offenses. Even in those cases, girls were more likely to be taken out of the home environment by the courts through a custody transfer while boys were more likely to be sent to a lock-up facility.  相似文献   
1000.
The increasing number of discussions on the influence of toxic environmental factors, including SIDS, prompted systematic postmortem chemical-toxicological investigations to be carried out on 54 SIDS cases and 2 control cases of the same age group. Tissue levels of arsenic, lead, cadmium, mercury, and pentachlorphenol, as well as other organic noxious agents, were measured in several organs. In addition, the COHb concentrations were determined. In spite of the widely scattered values, the extreme levels measured and the arithmetic means and median averages of As, Pb, Cd, Hg, PCP, and COHb had no more range in concentrations than can be expected for toxic effects - according to present knowledge anyway. It was observed that infants from an urban environment showed no greater concentration of noxious agents than did infants from rural regions. There were also no differences between SIDS cases and the controls, nor was there a correlation between infections of the respiratory system that are often morphologically detected - including laryngitis - and higher concentrations of these agents in the organs of SIDS cases.  相似文献   
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