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   17541篇
  免费   1315篇
各国政治   716篇
工人农民   570篇
世界政治   1272篇
外交国际关系   508篇
法律   12579篇
中国共产党   1篇
中国政治   110篇
政治理论   2993篇
综合类   107篇
  2020年   402篇
  2019年   411篇
  2018年   491篇
  2017年   561篇
  2016年   571篇
  2015年   522篇
  2014年   500篇
  2013年   1780篇
  2012年   387篇
  2011年   494篇
  2010年   640篇
  2009年   605篇
  2008年   417篇
  2007年   387篇
  2006年   490篇
  2005年   384篇
  2004年   392篇
  2003年   363篇
  2002年   329篇
  2001年   697篇
  2000年   567篇
  1999年   485篇
  1998年   234篇
  1997年   190篇
  1996年   168篇
  1995年   199篇
  1994年   221篇
  1993年   200篇
  1992年   344篇
  1991年   367篇
  1990年   347篇
  1989年   366篇
  1988年   312篇
  1987年   304篇
  1986年   317篇
  1985年   340篇
  1984年   311篇
  1983年   288篇
  1982年   216篇
  1981年   199篇
  1980年   176篇
  1979年   245篇
  1978年   159篇
  1977年   129篇
  1976年   113篇
  1975年   114篇
  1974年   125篇
  1973年   114篇
  1972年   94篇
  1971年   90篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
251.
252.
Quinn JB 《Newsweek》1996,128(14):53
  相似文献   
253.
254.
255.
Nuland SB 《Time》1996,148(14):8-13
  相似文献   
256.
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   
257.
258.
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   
259.
Ninety Breathalyzer instruments (Model 1000) and twenty instruments (Models 900, 900A) were studied using a protocol described by the Department of Transportation's "Standard for Devices to Measure Breath Alcohol." Although the mean of each of three concentrations tested (0.05, 0.10, and 0.15 g/210 L) compared favorably in both series, the standard deviation was consistently higher for the Model 1000 instruments. The Model 1000 instruments also produced a significant number of test results which exceeded the normally expected scientific deviation.  相似文献   
260.
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