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   2603146篇
  免费   186064篇
  国内免费   7691篇
耳鼻咽喉   34418篇
儿科学   85563篇
妇产科学   71880篇
基础医学   365400篇
口腔科学   70312篇
临床医学   236072篇
内科学   518848篇
皮肤病学   62794篇
神经病学   214423篇
特种医学   100234篇
外国民族医学   741篇
外科学   388456篇
综合类   50766篇
现状与发展   5篇
一般理论   979篇
预防医学   197510篇
眼科学   57348篇
药学   189524篇
  8篇
中国医学   5520篇
肿瘤学   146100篇
  2021年   20902篇
  2019年   21369篇
  2018年   30154篇
  2017年   23245篇
  2016年   26908篇
  2015年   30178篇
  2014年   41344篇
  2013年   61480篇
  2012年   81648篇
  2011年   85947篇
  2010年   51858篇
  2009年   49798篇
  2008年   79964篇
  2007年   84683篇
  2006年   86247篇
  2005年   82318篇
  2004年   79181篇
  2003年   76401篇
  2002年   73639篇
  2001年   128437篇
  2000年   131366篇
  1999年   110532篇
  1998年   31290篇
  1997年   27949篇
  1996年   28251篇
  1995年   27403篇
  1994年   25080篇
  1993年   23440篇
  1992年   85169篇
  1991年   81573篇
  1990年   78793篇
  1989年   76075篇
  1988年   69480篇
  1987年   68003篇
  1986年   63551篇
  1985年   60518篇
  1984年   44952篇
  1983年   37957篇
  1982年   22466篇
  1981年   19993篇
  1979年   38969篇
  1978年   27446篇
  1977年   23257篇
  1976年   21504篇
  1975年   22816篇
  1974年   26789篇
  1973年   25377篇
  1972年   23752篇
  1971年   21958篇
  1970年   20184篇
排序方式: 共有10000条查询结果,搜索用时 10 毫秒
971.
To assess the relationship between the DSM-III criteria for attention deficit disorder with hyperactivity (ADDH) and the DSM-III-R criteria for attention-deficit hyperactivity disorder (ADHD), children from an inner city parochial school were evaluated using a 30-item teacher questionnaire consisting of the DMS-III and DSM-III-R criteria for these disorders, the revised Conners Parent and Teacher Questionnaires, and a continuous performance test. Diagnostic groups were established based on teacher ratings of the DSM items and evaluated in relation to the rating scale data and continuous performance test. While children who were identified by teachers as having ADDH almost always satisfied the criteria for ADHD, a new group of children who were hyperactive and impulsive but less clearly inattentive also met the criteria for ADHD. Implications of the change in diagnostic criteria are discussed.  相似文献   
972.
973.
Thirty-four epileptic patients, aged 9 to 36, were submitted to A/EEG between May 1987 and July 1988. All patients had a thorough clinical and EEG work-up including long-term conventional EEG, afternoon polygraphic sleep recording and, in some cases, full-night EEG and video monitoring. Patients were divided into 2 groups: group I included 19 patients (18 with symptomatic partial epilepsy (SPE) and 1 with idiopathic generalized epilepsy (IGE) in whom no seizure had ever been recorded in spite of EEG recordings averaging a total of 16 hrs 10 min, awake and asleep); group II included 15 subjects (6 with SPE, 5 with IGE, 3 with symptomatic GE and 1 with undetermined epilepsy) in whom one or several seizures had been recorded. A/EEG was performed in order to: 1) obtain better clinical and EEG characterization of seizures, 2) study the circadian distribution of seizures, 3) verify the efficacy of drug treatment and, 4) establish the epileptic or non-epileptic nature of some ictal events. The results of A/EEG were considered positive in 52.63% of group I patients and in 93.33% of group II patients. The authors discuss the specific advantages of A/EEG vs conventional EEG: recording of seizures with random occurrence, of seizures accompanied by falls, checking the remission of seizures.  相似文献   
974.
975.
The authors describe a case of retrobulbar optic neuropathy in a patient with type 1 Diabetes mellitus. In spite of good metabolic control, there has been a slow but progressive functional visual decline. Worthy of note is the abnormal precocity of the appearance of the functional damage of the optic nerve compared to the involvement of the peripheral system.  相似文献   
976.
977.
978.
S Bilancini  M Lucchi 《Phlébologie》1989,42(1):151-156
The subject of enlarged legs is vast and complex. Up to now there has been no organic classification of the clinical picture involved. The basic problem is that of the criterion on which to base the classification. Literature on this subject has opted for the pathogenic criterion because it seems to facilitate the formulation of a classification which is of use to the doctor. One possibility would be to divide the syndrome into vascular and non-vascular swollen legs. The first group could in turn be separated into macro-circulating and micro-circulatory. The micro-circulatory forms can be primitive or secondary. Amongst the secondary micro-circulatory forms, two other groups can be singled out: secondary forms with local cause and secondary forms caused by organic pathology. However, there are clinical forms which are on the periphery of these different groups and these forms are subject to discussion regarding nosographic localization.  相似文献   
979.
Dawn and dusk simulation as a therapeutic intervention   总被引:1,自引:0,他引:1  
  相似文献   
980.
Three different sensory loss tests, for anaesthesia to light touch, for diminished pain sensation and for loss of thermosensation, were compared with histopathological examination results in the diagnosis of suspected tuberculoid leprosy in 120 individuals with 126 lesions. Though none of the 3 tests used in this study was found to be strikingly superior to any of the others, the results indicate potentially important differences in their usefulness in different subgroups of suspected patients. The methodological problems inherent in such studies are discussed.  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