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   2604532篇
  免费   178205篇
  国内免费   3564篇
耳鼻咽喉   34346篇
儿科学   84544篇
妇产科学   67827篇
基础医学   375385篇
口腔科学   67070篇
临床医学   231687篇
内科学   504973篇
皮肤病学   53493篇
神经病学   208103篇
特种医学   99408篇
外国民族医学   493篇
外科学   396449篇
综合类   51460篇
现状与发展   13篇
一般理论   952篇
预防医学   206573篇
眼科学   59201篇
药学   189378篇
  11篇
中国医学   5300篇
肿瘤学   149635篇
  2021年   20291篇
  2019年   20840篇
  2018年   48768篇
  2017年   37571篇
  2016年   42802篇
  2015年   28035篇
  2014年   38986篇
  2013年   58310篇
  2012年   85858篇
  2011年   103787篇
  2010年   66772篇
  2009年   58080篇
  2008年   97989篇
  2007年   106248篇
  2006年   86095篇
  2005年   85444篇
  2004年   83550篇
  2003年   81984篇
  2002年   77657篇
  2001年   109991篇
  2000年   112814篇
  1999年   94575篇
  1998年   28343篇
  1997年   24940篇
  1996年   25007篇
  1995年   23739篇
  1994年   21783篇
  1993年   20508篇
  1992年   72754篇
  1991年   70846篇
  1990年   69077篇
  1989年   66337篇
  1988年   60935篇
  1987年   59760篇
  1986年   55828篇
  1985年   53677篇
  1984年   40066篇
  1983年   34173篇
  1982年   20801篇
  1979年   36473篇
  1978年   26221篇
  1977年   21823篇
  1976年   20869篇
  1975年   22262篇
  1974年   26560篇
  1973年   25197篇
  1972年   23537篇
  1971年   22294篇
  1970年   20528篇
  1969年   19532篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
31.
32.
33.
34.
35.
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   
36.
37.
38.
39.
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   
40.
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