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   3451780篇
  免费   247388篇
  国内免费   6135篇
耳鼻咽喉   47027篇
儿科学   112624篇
妇产科学   94009篇
基础医学   498795篇
口腔科学   98300篇
临床医学   313704篇
内科学   664385篇
皮肤病学   77037篇
神经病学   272387篇
特种医学   129171篇
外国民族医学   693篇
外科学   518339篇
综合类   76025篇
现状与发展   14篇
一般理论   1255篇
预防医学   267439篇
眼科学   82722篇
药学   254821篇
  13篇
中国医学   7545篇
肿瘤学   188998篇
  2021年   26897篇
  2019年   27780篇
  2018年   39061篇
  2017年   29478篇
  2016年   32933篇
  2015年   37187篇
  2014年   52405篇
  2013年   78202篇
  2012年   107870篇
  2011年   114341篇
  2010年   68227篇
  2009年   64002篇
  2008年   106776篇
  2007年   113779篇
  2006年   115043篇
  2005年   111031篇
  2004年   106800篇
  2003年   102382篇
  2002年   98835篇
  2001年   163009篇
  2000年   167346篇
  1999年   140352篇
  1998年   39865篇
  1997年   34853篇
  1996年   35045篇
  1995年   33250篇
  1994年   30572篇
  1993年   28584篇
  1992年   108242篇
  1991年   105204篇
  1990年   101940篇
  1989年   98358篇
  1988年   90197篇
  1987年   88287篇
  1986年   83050篇
  1985年   79482篇
  1984年   59009篇
  1983年   50282篇
  1982年   29364篇
  1979年   53684篇
  1978年   37853篇
  1977年   31787篇
  1976年   30144篇
  1975年   32053篇
  1974年   38828篇
  1973年   37182篇
  1972年   34707篇
  1971年   32632篇
  1970年   30277篇
  1969年   28628篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
42.
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   
43.
44.
45.
46.
47.
48.
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   
49.
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