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   7701篇
  免费   525篇
各国政治   369篇
工人农民   274篇
世界政治   554篇
外交国际关系   284篇
法律   5214篇
中国政治   42篇
政治理论   1451篇
综合类   38篇
  2023年   43篇
  2020年   175篇
  2019年   194篇
  2018年   217篇
  2017年   259篇
  2016年   242篇
  2015年   223篇
  2014年   213篇
  2013年   823篇
  2012年   184篇
  2011年   186篇
  2010年   224篇
  2009年   237篇
  2008年   190篇
  2007年   179篇
  2006年   173篇
  2005年   174篇
  2004年   189篇
  2003年   171篇
  2002年   152篇
  2001年   324篇
  2000年   257篇
  1999年   233篇
  1998年   100篇
  1997年   73篇
  1996年   72篇
  1995年   86篇
  1994年   94篇
  1993年   95篇
  1992年   155篇
  1991年   159篇
  1990年   147篇
  1989年   159篇
  1988年   128篇
  1987年   140篇
  1986年   126篇
  1985年   133篇
  1984年   106篇
  1983年   119篇
  1982年   82篇
  1981年   78篇
  1980年   56篇
  1979年   108篇
  1978年   70篇
  1977年   60篇
  1976年   52篇
  1975年   49篇
  1974年   59篇
  1973年   57篇
  1972年   44篇
排序方式: 共有8226条查询结果,搜索用时 0 毫秒
111.
"The research is based on a study carried out between 1989 and 1991 in the three rural communities in the state of Morelos [Mexico] that included a socio-demographic survey and interviews. The methodological goal of the authors is to view nuptiality from demographic and anthropological standpoints.... The authors seek to pinpoint the elements that account for changes that have taken place in nuptiality, as well as to identify the impact of these changes on [descendants]." (SUMMARY IN ENG)  相似文献   
112.
113.
Quinn JB 《Newsweek》1996,128(14):53
  相似文献   
114.
115.
116.
Nuland SB 《Time》1996,148(14):8-13
  相似文献   
117.
In 1974, hospitals in Rhode Island have participated in annual negotiations with state officials and representatives from Blue Cross to determine the allowed increase in statewide hospital costs (the "Maxicap") for the next fiscal year, based on projected increases in hospitals' revenues, changes in patient volume and operating expenses. Individual hospital budgets may be above or below the Maxicap as long as the total increase in hospital costs for all hospitals in the state does not exceed the negotiated amount. At a time when regulatory solutions are increasingly under fire, continued support for Rhode Island's approach to hospital cost containment from third party payers, providers and public officials stands in stark contrast to other states where rate setting was either dismantled or discredited as a cost control strategy. A negotiated global cap on hospital expenditures offers an alternative to formula-based state rate-setting methodologies which could be incorporated as part of an all-payer reimbursement methodology or as an incremental step towards more comprehensive reform.  相似文献   
118.
119.
In malignant hyperthermia, myophosphorylase reaction shows characteristic changes that take place within minutes: (1) a generally strongly weakened reaction; (2) numerous negatively reacting fibres; (3) frequently, fibre sections that show spotty and/or striatal weak or negative reactions and fibre sections with strong striatal reactions with relatively narrow sarcomere spacings (a "sign of hypercontraction"). Obviously, the morphological findings that show characteristic "striated fibres" are typical of the malignant hyperthermia syndrome! It is important to note that the muscular fibres showing such changes are, as a rule, inconspicuous when using other stains and reactions. These pathological myophosphorylase reactions were observed in five deceased patients (one independently of anaesthesia after an extended walk) and in 19 pigs (18 times after halothane testing and once in an experimental animal with clinical evidence of the presence of malignant hyperthermia). These reactions were not noted in pigs with negative halothane reactivity or prior to halothane testing. They were also not seen in a large number of very different healthy and diseased control and reference cases from our biopsy and autopsy material. Myophosphorylase reaction enables convincing demonstration of malignant hyperthermia, past or present. Hence, it is possible to elucidate puzzling deaths or verify apparently clear death occurring during or subsequent to anaesthesia or simply following stress ("human stress syndrome"). Many of these deaths doubtlessly escape the attention of clinicians using the usual morphological examination methods. However, the reaction cannot be used to identify potential victims.  相似文献   
120.
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