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   3273334篇
  免费   226747篇
  国内免费   9364篇
耳鼻咽喉   44943篇
儿科学   108063篇
妇产科学   90524篇
基础医学   460001篇
口腔科学   89819篇
临床医学   298209篇
内科学   635773篇
皮肤病学   78173篇
神经病学   264389篇
特种医学   126180篇
外国民族医学   923篇
外科学   487677篇
综合类   67504篇
现状与发展   7篇
一般理论   1178篇
预防医学   246961篇
眼科学   74194篇
药学   244899篇
  28篇
中国医学   7812篇
肿瘤学   182188篇
  2021年   25539篇
  2019年   25999篇
  2018年   36537篇
  2017年   28361篇
  2016年   32675篇
  2015年   36816篇
  2014年   50439篇
  2013年   74984篇
  2012年   100107篇
  2011年   105758篇
  2010年   63795篇
  2009年   60768篇
  2008年   98277篇
  2007年   104549篇
  2006年   106441篇
  2005年   102029篇
  2004年   97924篇
  2003年   94470篇
  2002年   91168篇
  2001年   159707篇
  2000年   163705篇
  1999年   137836篇
  1998年   39118篇
  1997年   34716篇
  1996年   34848篇
  1995年   33679篇
  1994年   30636篇
  1993年   28730篇
  1992年   106467篇
  1991年   102487篇
  1990年   99652篇
  1989年   96387篇
  1988年   88056篇
  1987年   86036篇
  1986年   80928篇
  1985年   77001篇
  1984年   57132篇
  1983年   48143篇
  1982年   28296篇
  1979年   50576篇
  1978年   35267篇
  1977年   30602篇
  1976年   27786篇
  1975年   30129篇
  1974年   35381篇
  1973年   33759篇
  1972年   31871篇
  1971年   29636篇
  1970年   27244篇
  1969年   26238篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
42.
43.
44.
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   
45.
46.
47.
48.
49.
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   
50.
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