全文获取类型
收费全文 | 3248673篇 |
免费 | 249968篇 |
国内免费 | 6293篇 |
专业分类
耳鼻咽喉 | 48121篇 |
儿科学 | 99994篇 |
妇产科学 | 89048篇 |
基础医学 | 454358篇 |
口腔科学 | 96129篇 |
临床医学 | 291007篇 |
内科学 | 631620篇 |
皮肤病学 | 68753篇 |
神经病学 | 269153篇 |
特种医学 | 129163篇 |
外国民族医学 | 1251篇 |
外科学 | 494659篇 |
综合类 | 78210篇 |
现状与发展 | 7篇 |
一般理论 | 1307篇 |
预防医学 | 252731篇 |
眼科学 | 78187篇 |
药学 | 244087篇 |
8篇 | |
中国医学 | 6369篇 |
肿瘤学 | 170772篇 |
出版年
2018年 | 31683篇 |
2016年 | 27258篇 |
2015年 | 30747篇 |
2014年 | 44173篇 |
2013年 | 67507篇 |
2012年 | 90118篇 |
2011年 | 95217篇 |
2010年 | 56185篇 |
2009年 | 54248篇 |
2008年 | 90868篇 |
2007年 | 97392篇 |
2006年 | 98329篇 |
2005年 | 95918篇 |
2004年 | 92483篇 |
2003年 | 89613篇 |
2002年 | 88494篇 |
2001年 | 149468篇 |
2000年 | 154544篇 |
1999年 | 131056篇 |
1998年 | 37296篇 |
1997年 | 34005篇 |
1996年 | 33163篇 |
1995年 | 32055篇 |
1994年 | 30025篇 |
1993年 | 27943篇 |
1992年 | 104863篇 |
1991年 | 101215篇 |
1990年 | 98242篇 |
1989年 | 95098篇 |
1988年 | 88345篇 |
1987年 | 87074篇 |
1986年 | 82941篇 |
1985年 | 79231篇 |
1984年 | 59895篇 |
1983年 | 51041篇 |
1982年 | 31011篇 |
1981年 | 27779篇 |
1980年 | 26032篇 |
1979年 | 56765篇 |
1978年 | 40161篇 |
1977年 | 34347篇 |
1976年 | 31746篇 |
1975年 | 34470篇 |
1974年 | 41888篇 |
1973年 | 40141篇 |
1972年 | 37984篇 |
1971年 | 35386篇 |
1970年 | 33421篇 |
1969年 | 31357篇 |
1968年 | 28853篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
Jean-Sébastien Fallu Jürgen Rehm Emmanuel N. Kuntsche Esther Grichting Neerav Monga Edward M. Adlaf Susan J Bondy Gerhard Gmel 《Sozial- und Pr?ventivmedizin》2006,8(1):363-372
Volume and profile of alcohol consumption among students and classmates as predictors of aggression and victimization: a multilevel
analysis among Swiss adolescents
Objective:
To test the effects of the volume of alcohol consumption and drinking patterns on alcohol-related aggression and victimization, both at the individual and class levels. 相似文献102.
103.
Severe adverse effects during the use of ovulation inhibitors occur mostly in women who have an elevated risk for the development of certain diseases owing to hereditary or acquired factors. By means of a careful personal or family history analysis as well as specific laboratory examinations, an existing predisposition may frequently be diagnosed and the individual risk associated with the use of oral contraceptive inhibitors may be estimated. The present contribution describes the potential effects of treatment with ovulation inhibitors on women with thrombophilia, cardiovascular disease, diabetes mellitus, dyslipidemia, overweight or underweight, tumors, psychiatric and neurological diseases and autoimmune disease. The hormonal methods and non-hormonal alternatives available for contraception are elucidated according to existing lesions and risk factors and the advantages and disadvantages are discussed. 相似文献
104.
灾难的时代错误:灾害医学的过去、现在和将来(一) 总被引:1,自引:0,他引:1
灾难,特别是地震、火山、洪水以及与战争有关的事件如饥饿和流行性传染病,是人类有记录的经历的一部分。从意大利庞贝的火山爆发,到约翰斯顿的洪水、第二次世界大战和黑色瘟疫,到西班牙流感,都发生了灾难,这不会被传说和历史书籍长期忘却。不过,在20世纪中叶以前,那些灾难的发生相对较少,且相距时间较长。从20世纪中叶以来,灾难的本质发生了变化。从恐怖分子使用“新技术”,到与气候有关的导致亿万美元经济损失的事件,表明这个世界正在发生变化。仅仅在最近的50~60年间,造成多种多样的伤亡事件,其危险性和频率的增加引人注目,并且注定要在接… 相似文献
105.
R E Dales A Mehdizadeh S D Aaron K L Vandemheen J Clinch 《The European respiratory journal》2006,28(2):319-322
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
106.
M Bernasconi P N Chhajed F Gambazzi L Bubendorf H Rasch S Kneifel M Tamm 《The European respiratory journal》2006,27(5):889-894
There are no data available combining transbronchial needle aspiration (TBNA) of mediastinal lymph nodes and positron emission tomography (PET) in the staging of nonsmall cell lung cancer (NSCLC). The aim of the current study was to determine if these two methods can enhance the negative predictive value of the individual modality alone, for a specific lymph node station, and if this integrated approach can reduce the number of mediastinoscopies. A total of 113 patients with enlarged mediastinal lymph nodes (> or = 1 cm), who underwent both TBNA and PET scanning, were included. In 51 patients, histopathology, confirmed by surgical lymph node dissection, was compared with PET results and TBNA. Sensitivity, specificity, positive predictive value, negative predictive value and accuracy to detect malignant lymphadenopathy was 68 (13/19), 89 (119/134), 46 (13/28), 95 (119/125) and 86% (132/152) for PET, respectively; 54% (6/11), 100 (53/53), 100 (6/6), 91 (53/58) and 92% (59/64), respectively for TBNA; and 100 (11/11), 94 (50/53), 79 (11/14), 100 (50/50) and 95 (61/64) for combined TBNA and PET, respectively. Combination of transbronchial needle aspiration and positron emission tomography has the potential to allow adequate mediastinal staging of nonsmall cell lung cancer with enlarged lymph nodes in most patients without the need for mediastinoscopy. 相似文献
107.
108.
109.
110.