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   2681649篇
  免费   190261篇
  国内免费   8160篇
耳鼻咽喉   35240篇
儿科学   88236篇
妇产科学   73812篇
基础医学   376769篇
口腔科学   73228篇
临床医学   243231篇
内科学   536355篇
皮肤病学   64833篇
神经病学   222707篇
特种医学   102140篇
外国民族医学   737篇
外科学   395006篇
综合类   50762篇
现状与发展   5篇
一般理论   1011篇
预防医学   205555篇
眼科学   58245篇
药学   194645篇
  8篇
中国医学   5702篇
肿瘤学   151843篇
  2021年   23219篇
  2019年   23312篇
  2018年   32378篇
  2017年   24941篇
  2016年   28901篇
  2015年   32443篇
  2014年   44422篇
  2013年   65570篇
  2012年   87913篇
  2011年   92535篇
  2010年   55383篇
  2009年   52851篇
  2008年   85466篇
  2007年   90243篇
  2006年   91504篇
  2005年   87315篇
  2004年   83685篇
  2003年   80545篇
  2002年   77348篇
  2001年   128925篇
  2000年   131721篇
  1999年   111064篇
  1998年   31920篇
  1997年   28508篇
  1996年   28701篇
  1995年   27784篇
  1994年   25445篇
  1993年   23722篇
  1992年   85450篇
  1991年   81764篇
  1990年   78995篇
  1989年   76270篇
  1988年   69659篇
  1987年   68166篇
  1986年   63720篇
  1985年   60652篇
  1984年   45080篇
  1983年   38081篇
  1982年   22604篇
  1981年   20098篇
  1979年   39045篇
  1978年   27533篇
  1977年   23326篇
  1976年   21561篇
  1975年   22858篇
  1974年   26841篇
  1973年   25406篇
  1972年   23779篇
  1971年   21983篇
  1970年   20215篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
991.
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   
992.
993.
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   
994.
995.
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   
996.
997.
998.
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   
999.
Dawn and dusk simulation as a therapeutic intervention   总被引:1,自引:0,他引:1  
  相似文献   
1000.
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