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   7238篇
  免费   481篇
各国政治   343篇
工人农民   223篇
世界政治   475篇
外交国际关系   250篇
法律   5039篇
中国政治   34篇
政治理论   1318篇
综合类   37篇
  2020年   157篇
  2019年   169篇
  2018年   185篇
  2017年   213篇
  2016年   217篇
  2015年   200篇
  2014年   183篇
  2013年   762篇
  2012年   158篇
  2011年   169篇
  2010年   207篇
  2009年   224篇
  2008年   167篇
  2007年   162篇
  2006年   169篇
  2005年   162篇
  2004年   179篇
  2003年   160篇
  2002年   144篇
  2001年   309篇
  2000年   255篇
  1999年   229篇
  1998年   101篇
  1997年   67篇
  1996年   73篇
  1995年   79篇
  1994年   88篇
  1993年   90篇
  1992年   151篇
  1991年   156篇
  1990年   149篇
  1989年   157篇
  1988年   125篇
  1987年   138篇
  1986年   125篇
  1985年   133篇
  1984年   102篇
  1983年   117篇
  1982年   83篇
  1981年   79篇
  1980年   55篇
  1979年   109篇
  1978年   69篇
  1977年   58篇
  1976年   52篇
  1975年   48篇
  1974年   56篇
  1973年   57篇
  1972年   46篇
  1968年   40篇
排序方式: 共有7719条查询结果,搜索用时 31 毫秒
941.
942.
943.
944.
Gc-subtyping was carried out on blood stains that had been made on cotton and glass and stored under a variety of conditions ranging from -20 degrees to +56 degrees C. The limits of detection ranged from 2 weeks at 56 degrees C up to 92 weeks at +4 degrees C and greater than 116 weeks at -20 degrees C. Additional bands that have been reported in other studies could not be detected during this study, and this difference is thought to be due to storage of the samples in the liquid state.  相似文献   
945.
We have shown first, that if the electoral college was abolished the theoretically measured power of voters would increase and second, that in presidential elections the measure of voting power used does in fact have a highly significant impact on the decision as to whether or not to vote. Thus, the analysis predicts that the abolition of the electoral college would have a significant impact on voter participation. From a policy viewpoint, if we view participation in elections as desirable, this could be used as an argument in favor of direct election of the president. From a scientific viewpoint, we are able to make a strong and unambiguous prediction about the results of a (possible) future event from theoretical considerations. If the electoral college should be abolished, it will be possible to test our predictions. In addition, we have provided a further test of the rational behavior view of electoral participation and have shown that this model applies to presidential elections. Finally, we have shown that the theoretical measure of voting power does predict actual behavior.  相似文献   
946.
Suggesting that licensing may not only fail to accomplish its intended purpose, but may be counterproductive, the author asserts that licensing may not improve the quality of professional services, that licensing boards fail to discipline unethical or incompetent practitioners, and that actions taken against the unlicensed are more often aimed at eliminating competition, not incompetence. In addition, licensing laws may have negative side effects, including an increase in the cost of professional services, the creation of shortages and maldistributions in supply, ineffective use of paraprofessionals, and impediments to needed reforms in education, training, and services. He concludes that equally effective alternatives may be available that are less expensive and have less negative impact, and advocates a system of registration for all practitioners, as well as making other suggestions to improve the overall functioning of licensing boards. Finally, because of political realities, the author proposes a compromise between his ideal model and the current system.  相似文献   
947.
948.
The pattern of immunocytochemical staining with antibodies to caeruloplasmin, myosin, myoglobin and C-reactive protein seen in myocardium taken from deaths with macroscopic evidence of myocardial infarction and/or significant coronary artery atherosclerosis and from deaths with neither of these lesions has been correlated with H&E, PTAH and HBFP staining of myocardium and circumstances of each death indicative of antemortem hypoxia and/or ischaemia. Loss of staining with these antibodies correlated well with fuchsinorrhagia and both techniques are more sensitive than H&E and PTAH staining in the detection of early ischaemic/hypoxic damage to myocardium. However, their sensitivity is such that they appear to detect agonal changes and, therefore, cannot be used for specific diagnosis of early myocardial infarction.  相似文献   
949.
950.
An animal model was designed to evaluate the ability of the standard military flak jacket to protect the kidneys from direct ballistic trauma. Yorkshire swine were anesthetized and their flanks were protected by flak jackets. Ballistic insults ranging from a low-velocity handgun to a high-velocity rifle were evaluated. The results demonstrate that a flak jacket provides adequate protection against low- and mid-velocity projectiles since none of the animals from this group had evidence of internal trauma and because only minor superficial surgical attention would have been required. Survivability in each case was considered to be excellent. The flak jacket failed to provide any protection against several types of high-velocity bullets. These weapons caused severe internal injury to the genitourinary system as well as to other major organ systems. Survival would have been unlikely.  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