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   1344115篇
  免费   112970篇
  国内免费   6377篇
耳鼻咽喉   16784篇
儿科学   43200篇
妇产科学   36716篇
基础医学   184346篇
口腔科学   36374篇
临床医学   121381篇
内科学   279520篇
皮肤病学   31918篇
神经病学   111121篇
特种医学   55671篇
外国民族医学   274篇
外科学   210958篇
综合类   31654篇
现状与发展   2篇
一般理论   425篇
预防医学   107410篇
眼科学   28202篇
药学   94138篇
  5篇
中国医学   2230篇
肿瘤学   71133篇
  2018年   13584篇
  2017年   10786篇
  2016年   12961篇
  2015年   14472篇
  2014年   20187篇
  2013年   30100篇
  2012年   36679篇
  2011年   39330篇
  2010年   24567篇
  2009年   24089篇
  2008年   36664篇
  2007年   39058篇
  2006年   40185篇
  2005年   38754篇
  2004年   36908篇
  2003年   36035篇
  2002年   34027篇
  2001年   66123篇
  2000年   67975篇
  1999年   56660篇
  1998年   16780篇
  1997年   15051篇
  1996年   16045篇
  1995年   16279篇
  1994年   15136篇
  1993年   14179篇
  1992年   47140篇
  1991年   45788篇
  1990年   43999篇
  1989年   41847篇
  1988年   38798篇
  1987年   38115篇
  1986年   35886篇
  1985年   34660篇
  1984年   26385篇
  1983年   22132篇
  1982年   13873篇
  1981年   12467篇
  1980年   11735篇
  1979年   23566篇
  1978年   17093篇
  1977年   14403篇
  1976年   13198篇
  1975年   13735篇
  1974年   16111篇
  1973年   15413篇
  1972年   14198篇
  1971年   13053篇
  1970年   11900篇
  1969年   11116篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
51.
There is increasing evidence that the assessment of eosinophilic airway inflammation using induced sputum and measurement of airway hyperresponsiveness provides additional, clinically important information concerning asthma control. The aim of this study was to directly compare the effects of different treatments on these markers in patients with asthma and persistent symptoms, despite the use of low-dose inhaled corticosteroids. A double-blind four-way crossover study was performed, which compared a 1-month treatment with budesonide 400 mug b.i.d., additional formoterol, additional montelukast and placebo in 49 patients with uncontrolled asthma despite budesonide 100 mug b.i.d., with each treatment separated by a 4-week washout period. The change in sputum eosinophil count with formoterol (2.4 to 3.8% change, 0.6-fold reduction, 95% confidence interval (CI) 0.5-0.9) differed significantly from placebo (2.8 to 2.5% change, 1.1-fold reduction, 95% CI 0.7-1.6) and high-dose budesonide (2.7 to 1.6% change, 1.6-fold reduction, 95% CI 1.2-2.2). The effects of montelukast did not differ from placebo. The changes in methacholine airway responsiveness were small and did not differ between treatments. High-dose budesonide had the broadest range of beneficial effects on other outcomes, including symptom scores, morning peak expiratory flow and forced expiratory volume in one second. In conclusion, treatment given in addition to low-dose inhaled corticosteroids results in modest benefits. Formoterol and high-dose budesonide have contrasting effects on eosinophilic airway inflammation.  相似文献   
52.
53.
54.
55.
56.
The aim of the present study was to explore differences in the clinical expression, clinical diagnoses and management of airway diseases in a primary-care setting. Patients aged >or=35 yrs who had ever smoked were enrolled when they presented for any reason to one of eight rural primary-care practices. Respiratory symptom questionnaires and spirometry were administered. In total, 1,034 patients had acceptable and reproducible spirometry, of whom 550 (53%) were males and 484 (47%) were females. Males smoked more than females (41.2 versus 29.2 pack-yrs) respectively, and were more likely to have a pre-bronchodilator forced expiratory volume in one second/forced vital capacity <0.70 at 22.4 versus 11.8%, respectively. However, more females than males reported breathlessness (51.0 versus 42.8%, respectively), a prior diagnosis compatible with airflow obstruction and taking respiratory medications (23.4 versus 14.9%, respectively). In conclusion, the current results suggest that females are more likely than males to report breathlessness and be prescribed respiratory medications independent of differences in the severity of airflow obstruction.  相似文献   
57.
58.
59.
60.
For many parents stopping life-sustaining medical treatment on their dying infant is psychologically impossible. Dostoevsky's insights into human behavior, particularly the fact that individuals do not want the anxiety and guilt associated with responsibility for making difficult decisions, might change the way physicians approach parents for permission to withdraw life-prolonging medical interventions on dying infants.  相似文献   
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