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   2350373篇
  免费   171233篇
  国内免费   3319篇
耳鼻咽喉   32049篇
儿科学   75894篇
妇产科学   62689篇
基础医学   348199篇
口腔科学   63620篇
临床医学   211358篇
内科学   457325篇
皮肤病学   51729篇
神经病学   185294篇
特种医学   88013篇
外国民族医学   489篇
外科学   353893篇
综合类   47510篇
现状与发展   12篇
一般理论   848篇
预防医学   182748篇
眼科学   54325篇
药学   175125篇
  11篇
中国医学   4576篇
肿瘤学   129218篇
  2021年   18982篇
  2019年   19540篇
  2018年   27058篇
  2017年   20359篇
  2016年   22747篇
  2015年   25641篇
  2014年   36100篇
  2013年   53963篇
  2012年   74689篇
  2011年   79429篇
  2010年   47065篇
  2009年   44568篇
  2008年   74620篇
  2007年   79484篇
  2006年   80308篇
  2005年   77786篇
  2004年   74382篇
  2003年   71700篇
  2002年   69373篇
  2001年   108741篇
  2000年   111454篇
  1999年   93504篇
  1998年   26991篇
  1997年   23661篇
  1996年   24054篇
  1995年   22718篇
  1994年   20897篇
  1993年   19713篇
  1992年   72006篇
  1991年   70075篇
  1990年   68393篇
  1989年   65668篇
  1988年   60303篇
  1987年   59129篇
  1986年   55219篇
  1985年   53007篇
  1984年   39312篇
  1983年   33403篇
  1982年   19861篇
  1979年   35867篇
  1978年   25651篇
  1977年   21230篇
  1976年   20332篇
  1975年   21818篇
  1974年   26149篇
  1973年   24803篇
  1972年   23200篇
  1971年   22037篇
  1970年   20248篇
  1969年   19315篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
51.
52.
ContextIt is especially important that patients are well informed when making high-stakes, preference-sensitive decisions like those on the Physician Orders for Life-Sustaining Treatment (POLST) form. However, there is currently no way to easily evaluate whether patients understand key concepts when making these important decisions.ObjectivesTo develop a POLST knowledge survey.MethodsExpert (n = 62) ratings of key POLST facts were used to select items for a POLST knowledge survey. The survey was administered to nursing facility residents (n = 97) and surrogate decision-makers (n = 112). A subset (n = 135) were re-administered the survey after a standardized advance care planning discussion to assess the scale's responsiveness to change.ResultsThe 19-item survey demonstrated adequate reliability (α = 0.72.). Residents' scores (x = 11.4, standard deviation 3.3) were significantly lower than surrogate scores (x = 14.7, standard deviation 2.5) (P < 0.001). Scores for both groups increased significantly after administration of a standardized advance care planning discussion (P < 0.001). Although being a surrogate, age, race, education, cognitive functioning, and health literacy were significantly associated with higher POLST Knowledge Survey scores in univariate analyses, only being a surrogate (P < 0.001) and being white (P = 0.028) remained significantly associated with higher scores in multivariate analyses.ConclusionThe 19-item POLST Knowledge Survey demonstrated adequate reliability and responsiveness to change. Findings suggest the survey could be used to identify knowledge deficits and provide targeted education to ensure adequate understanding of key clinical decisions when completing POLST.  相似文献   
53.
54.
55.
56.
Nevo  N.  Goldstein  A. L.  Staierman  M.  Eran  N.  Carmeli  I.  Rayman  S.  mnouskin  Y. 《Hernia》2022,26(6):1491-1499
Hernia - The minimally invasive surgical repair of combined inguinal and ventral hernias often requires shifting from one approach or plane to another. The traditional enhanced-view totally...  相似文献   
57.
BackgroundSecond-hand smoking or environmental tobacco smoke is a critical health risk. Children are the most vulnerable to second-hand smoking because of their small bronchial ducts, less developed immunity, and low-physical activity.ObjectivesThe purpose of this study was to ascertain the effects of second-hand smoking on lung functions in athlete and non-athlete school-aged children.MethodsThis observational study included forty-six school-aged children, their age was 8–15 years, assigned to three groups; 2 study groups and 1 control group (n=15). The study groups comprised of 16 football players, and of 15 cyclists. Lung functions were evaluated recording forced vital capacity, forced expiratory volume in 1 sec and peak expiratory flow using digital spirometer.ResultsAll measures were recorded in definite values and the children were also classified into second-hand smoking (SH), or non-exposed to tobacco smoking (NE). The findings presented a significant increase (p<0.05) of the study groups in forced vital capacity, forced expiratory volume in 1 sec and peak expiratory flow solely for the non-exposed children. However, there were non-significant differences between the cyclists and football players or between the passive smoking children and non-exposed children in any of the two study groups (p>0.05).ConclusionThe outcomes of this study suggest beneficial influences of the sports activity on the lung functions, without different influences of the cyclists and football players on the lung functions.  相似文献   
58.
59.
60.
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