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   10275篇
  免费   969篇
  国内免费   18篇
耳鼻咽喉   98篇
儿科学   258篇
妇产科学   369篇
基础医学   1595篇
口腔科学   116篇
临床医学   798篇
内科学   2023篇
皮肤病学   495篇
神经病学   1035篇
特种医学   373篇
外科学   1351篇
综合类   74篇
一般理论   2篇
预防医学   1046篇
眼科学   99篇
药学   835篇
中国医学   37篇
肿瘤学   658篇
  2023年   80篇
  2022年   69篇
  2021年   164篇
  2020年   139篇
  2019年   195篇
  2018年   205篇
  2017年   187篇
  2016年   194篇
  2015年   218篇
  2014年   234篇
  2013年   447篇
  2012年   526篇
  2011年   502篇
  2010年   315篇
  2009年   305篇
  2008年   471篇
  2007年   408篇
  2006年   470篇
  2005年   436篇
  2004年   444篇
  2003年   382篇
  2002年   337篇
  2001年   312篇
  2000年   329篇
  1999年   297篇
  1998年   136篇
  1997年   96篇
  1996年   106篇
  1995年   112篇
  1994年   99篇
  1993年   85篇
  1992年   206篇
  1991年   218篇
  1990年   201篇
  1989年   222篇
  1988年   205篇
  1987年   191篇
  1986年   165篇
  1985年   173篇
  1984年   142篇
  1983年   108篇
  1982年   89篇
  1981年   69篇
  1979年   104篇
  1978年   75篇
  1977年   80篇
  1976年   63篇
  1975年   63篇
  1974年   65篇
  1973年   68篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
Healthcare workers (HCWs) are at increased risk of both exposure and transmission of infectious disease. Two European Union (EU) directives state that health services are responsible for assessing their employees’ potential exposure to infectious diseases and offering immunisation free of charge. We assessed current policy for immunisation of HCWs and the availability of vaccine coverage data in the Nordic countries by surveying national vaccination experts in Denmark, Finland, Iceland, Norway and Sweden, as well as Swedish county medical officers (CMOs). All national experts and 17 of 21 Swedish CMOs responded. All EU countries had transposed the European directives into national law, while Norway and Iceland had similar national legislation. Recommendations or guidelines were issued in Denmark, Finland, Iceland, Norway and 15 of 17 responding Swedish counties. The range of diseases covered differed by countries and Swedish counties. HCW vaccine coverage data were not systematically collected; incomplete estimates were only available for Finland and two Swedish counties. In conclusion, recommendations or guidelines exist in the Nordic countries, but their impact cannot be assessed, as vaccine uptake among HCWs is not currently measured. Systematic collection of data is a necessary step towards improving HCW immunisation policy and practice in the Nordic countries.  相似文献   
4.
In a randomised, double-blind study, 20 women with idiopathic detrusor instability and associated symptoms were treated with terodiline 25 mg bd, placebo, and emepronium bromide 200 mg tds--each drug being given for 3 weeks with placebo as wash-out period before cross-over. The results were evaluated according to drug preference, frequency charts and elimination of detrusor instability on cystometry. Serum levels of both drugs were monitored as control of tablet intake. The preference for terodiline to placebo was statistically significant: 14/3 women (P less than 0.05), and the majority of women (12/4) preferred terodiline to emepronium. Terodiline also gave a small but significant reduction in 24 h micturition frequency and eliminated detrusor instability in almost 50% of the patients (P less than 0.05). Side effects were frequent but mild in all three treatment periods. It was concluded that terodiline offers an alternative in the treatment of female detrusor instability.  相似文献   
5.
6.
Two cases are presented in which the cause of small-bowel obstruction was enterolith originating in jejunal diverticula.  相似文献   
7.
To measure prefrontal and subcortical activity during a cognitive task, we examined 19 newly diagnosed schizophrenics and patients with schizophreniform psychosis. Seven healthy volunteers served as controls. The patients were drug naive or had received neuroleptics for a few days only. Cerebral blood flow distribution was depicted by single photon emission computed tomography at rest and during activation with the Wisconsin Card Sorting Test. A significant relative activation deficit in the left inferior-prefrontal region was revealed during the Wisconsin Card Sorting Test in the patient group. Furthermore, the patients had impaired striatal suppression on the left side during the cognitive task. The test performance was significantly impaired in the patients. The inability to reduce striatal activity may be due to a lack of corticostriatal feedback during prefrontal activation.  相似文献   
8.
In a prospective, randomized trial, 104 consecutive patients with displaced femoral neck fractures were allocated either to fixation with a sliding screw plate or 4 ASIF cancellous bone screws. The patients were reexamined at fixed intervals to determine the time of union. The 2-year-cumulated rate of union was 64 per cent in the plate group and 84 per cent in the screw group.  相似文献   
9.
10.
The diurnal variation (DV) in peak expiratory flow rate (PEFR) has been studied among 132 grain elevator workers who accomplished three daily measurements of PEFR during three weeks. DV was calculated as the difference between the highest and the lowest PEFR as a percentage of the mean PEFR on each day. For the whole group the median was 5.9%. DV was higher among smokers and among workers with work related pulmonary symptoms. Analysis of variance showed that only age (p = 0.012) and smoking (p = 0.016) had a significant effect on DV. Pulmonary symptoms, total IgE, and duration of occupation had no independent impact on DV, whereas the exposure level of grain dust tended (p = 0.082) to have an independent effect. Twelve workers had an abnormally high DV (greater than 20%), of whom seven showed no signs of obstructive respiratory disease by spirometry. If only a single spirometric test had been performed the tentative diagnosis of bronchial asthma could have been missed in these seven workers.  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