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   2421482篇
  免费   173455篇
  国内免费   3323篇
耳鼻咽喉   32581篇
儿科学   78614篇
妇产科学   63864篇
基础医学   355966篇
口腔科学   64066篇
临床医学   215983篇
内科学   472686篇
皮肤病学   52080篇
神经病学   192616篇
特种医学   91418篇
外国民族医学   489篇
外科学   366616篇
综合类   48170篇
现状与发展   12篇
一般理论   848篇
预防医学   189443篇
眼科学   55095篇
药学   178636篇
  11篇
中国医学   4579篇
肿瘤学   134487篇
  2021年   18989篇
  2019年   19543篇
  2018年   35306篇
  2017年   27061篇
  2016年   30872篇
  2015年   25933篇
  2014年   36335篇
  2013年   54161篇
  2012年   77051篇
  2011年   86886篇
  2010年   52985篇
  2009年   49004篇
  2008年   82229篇
  2007年   88958篇
  2006年   80501篇
  2005年   79306篇
  2004年   76438篇
  2003年   74720篇
  2002年   71447篇
  2001年   108978篇
  2000年   111890篇
  1999年   93656篇
  1998年   27158篇
  1997年   23885篇
  1996年   24175篇
  1995年   22857篇
  1994年   21041篇
  1993年   19834篇
  1992年   72105篇
  1991年   70191篇
  1990年   68501篇
  1989年   65751篇
  1988年   60384篇
  1987年   59219篇
  1986年   55301篇
  1985年   53097篇
  1984年   39365篇
  1983年   33455篇
  1982年   19937篇
  1979年   35958篇
  1978年   25703篇
  1977年   21245篇
  1976年   20392篇
  1975年   21817篇
  1974年   26171篇
  1973年   24808篇
  1972年   23200篇
  1971年   22037篇
  1970年   20271篇
  1969年   19342篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
62.
63.
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   
64.
65.
66.
67.
68.
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   
69.
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   
70.
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