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   530075篇
  免费   27643篇
  国内免费   496篇
耳鼻咽喉   6681篇
儿科学   16922篇
妇产科学   12539篇
基础医学   92638篇
口腔科学   12347篇
临床医学   48501篇
内科学   95447篇
皮肤病学   11868篇
神经病学   34009篇
特种医学   19755篇
外国民族医学   53篇
外科学   78068篇
综合类   7610篇
现状与发展   2篇
一般理论   107篇
预防医学   38544篇
眼科学   11939篇
药学   41417篇
  1篇
中国医学   1126篇
肿瘤学   28640篇
  2021年   3894篇
  2018年   5733篇
  2017年   4126篇
  2016年   4871篇
  2015年   5362篇
  2014年   7116篇
  2013年   10505篇
  2012年   15574篇
  2011年   17393篇
  2010年   9957篇
  2009年   8824篇
  2008年   15713篇
  2007年   17449篇
  2006年   16943篇
  2005年   16261篇
  2004年   15884篇
  2003年   15264篇
  2002年   14786篇
  2001年   22432篇
  2000年   22971篇
  1999年   18921篇
  1998年   5233篇
  1997年   4364篇
  1996年   4397篇
  1995年   4124篇
  1992年   14414篇
  1991年   15817篇
  1990年   15950篇
  1989年   15626篇
  1988年   14308篇
  1987年   14201篇
  1986年   13168篇
  1985年   12686篇
  1984年   9394篇
  1983年   8000篇
  1982年   4177篇
  1979年   8939篇
  1978年   6383篇
  1977年   5150篇
  1976年   5505篇
  1975年   6615篇
  1974年   7421篇
  1973年   7158篇
  1972年   6598篇
  1971年   6310篇
  1970年   5887篇
  1969年   5468篇
  1968年   5161篇
  1967年   4621篇
  1966年   3963篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
This paper examines the effect of patient age, tumour grade and extent of surgery on the outcome of treatment of 278 patients with high grade malignant gliomas referred to the Queensland Radium Institute between 1980 and 1987. The aim was to determine whether the extent of surgical resection alters survival rates. The extent of surgery had no effect on survival except for those patients with grade 3 tumours in whom a total excision was possible. Those in whom only a biopsy was done did not have a worse prognosis. Grading was found to be of importance, as patients with grade 3 tumours had a better survival than those with grade 4 tumours. In grade 4 tumours, those under 30 years of age had a better survival than those over 30 years, whereas with grade 3 tumours there was a gradation of age effect (under 40 years best, then 40–49 years, and those 50 years and over doing worst).  相似文献   
52.
53.
54.
55.
This study examined electromyogram (EMG) and skin conductance level (SCL) as mediators of neuropsychological test performance of alcoholics. Alcoholics and controls with high EMG performed less well than low EMG subjects on 12 measures of neuropsychological performance. For SCL, the alcoholics and controls in the Low Group did not differ from those in the High Group on any measure. Analyses that used information intake (Low EMG and High SCL) and rejection (High EMG and Low SCL) information postures (IPs) demonstrated that the intake group outperformed the rejection group on 10 neuropsychological measures. Subjects with intake IPs reported more stimulation, concentration, and interest during the tasks than did subjects with rejection IPs. Results suggest that IPs can be used to identify alcoholics with neuropsychological deficits.  相似文献   
56.
57.
Fronto-ethmoidal mucocoeles: a histopathological analysis.   总被引:1,自引:0,他引:1  
From a series of 118 fronto-ethmoidal mucocoeles, 40 specimens have been submitted to detailed histological analysis. The frequency of each epithelial and sub-epithelial component is considered and reveals features which support a dynamic theory of bone resorption and formation rather than that of pressure erosion in the pathogenesis of mucocoeles.  相似文献   
58.
Facial reanimation after acoustic neuroma excision is currently accomplished using a variety of surgical techniques. A multi-institutional survey of patient perceptions of facial reanimation success was accomplished by mailing a questionnaire to 809 randomly selected members of the Acoustic Neuroma Association. Four hundred sixty patients who underwent 296 reanimation procedures responded. Facial to hypoglossal nerve anastomosis, tarsorrhaphy, and upper eyelid implants were most frequently performed. The patient's estimations of initial deficit, spontaneous recovery, and overall satisfaction with the reanimation procedures are discussed.  相似文献   
59.
Most authors consider the principal advantage of FG anastomoses (compared to microsurgical anastomoses) to be shorter operating time, reduced surgical trauma to oviduct stumps, and absence of tissue ischemia. These features promote reparative regeneration and decrease adhesion formation, resulting in complete recanalization of fallopian tubes. To date, the majority of work on FG is confined to the experimental development of surgical techniques. Investigations in reconstructive gynecological surgery are quite uncommon. The physical properties of FG and the positive results of available experimental studies suggest that further development of surgical techniques using FG in obstetrics and gynecology is worthwhile.  相似文献   
60.
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