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   3231306篇
  免费   257475篇
  国内免费   6655篇
耳鼻咽喉   45960篇
儿科学   102117篇
妇产科学   89149篇
基础医学   452690篇
口腔科学   92458篇
临床医学   295431篇
内科学   631592篇
皮肤病学   69021篇
神经病学   271762篇
特种医学   126916篇
外国民族医学   1186篇
外科学   484712篇
综合类   78362篇
现状与发展   4篇
一般理论   1331篇
预防医学   262415篇
眼科学   76484篇
药学   236438篇
  5篇
中国医学   6554篇
肿瘤学   170849篇
  2018年   34564篇
  2017年   26520篇
  2016年   29461篇
  2015年   33290篇
  2014年   47938篇
  2013年   72596篇
  2012年   97923篇
  2011年   103522篇
  2010年   61066篇
  2009年   58446篇
  2008年   97285篇
  2007年   103271篇
  2006年   104289篇
  2005年   101476篇
  2004年   97344篇
  2003年   93648篇
  2002年   91646篇
  2001年   150833篇
  2000年   155548篇
  1999年   130989篇
  1998年   38392篇
  1997年   34787篇
  1996年   34448篇
  1995年   33031篇
  1994年   30725篇
  1993年   28792篇
  1992年   103538篇
  1991年   99539篇
  1990年   95865篇
  1989年   92160篇
  1988年   85478篇
  1987年   84074篇
  1986年   79252篇
  1985年   75722篇
  1984年   57799篇
  1983年   49248篇
  1982年   30168篇
  1981年   26836篇
  1979年   53489篇
  1978年   37747篇
  1977年   31653篇
  1976年   29756篇
  1975年   31000篇
  1974年   38125篇
  1973年   36432篇
  1972年   34184篇
  1971年   31435篇
  1970年   29737篇
  1969年   27664篇
  1968年   25613篇
排序方式: 共有10000条查询结果,搜索用时 10 毫秒
101.
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.
INTRODUCTION: Autoimmune hepatitis (AIH) is a well-defined entity in the West but there are sparse Indian data on this disease. AIM: To study the clinical profile and response to treatment of Indian patients with AIH. METHODS: This is a part retrospective and part prospective study of 50 patients (median age 48 years, range 11-82; 43 women) seen between 1995 to 2001, diagnosed to have AIH as per the revised scoring system. Clinical and laboratory profile, response to treatment, and complications of treatment were analyzed. RESULTS: AIH accounted for 6% of all patients with liver disease seen during the period. The presenting symptoms were gastrointestinal in 43 and non-gastrointestinal in 7, with median symptom duration of 6 months (range 2 weeks to 40 years). Forty patients (80%) had chronic liver disease. Associated illnesses were present in 28 patients. Twenty-six patients were classified as definite and the rest as probable AIH. Forty-nine patients had Type 1 AIH. Five patients had overlap syndrome. Forty-five patients (90%) received immunosuppressive therapy. Twelve of 18 patients receiving only prednisolone and 21 of 27 patients receiving prednisolone and azathioprine combination responded. Thirteen (26%) patients had therapy-related complications (infectious 5, non infectious 8) with two treatment-related deaths. CONCLUSION: Type 1 AIH was the predominant type of AIH. The majority of patients with AIH presented with chronic liver disease. There was good response to immunosuppressive therapy. Therapy-related complications occurred in one-fourth of patients.  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.
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.
107.
A new semi-empirical formula for the evaluation of (n,(3)He) reaction cross-sections at the energy of 14.6 and 20 MeV is presented. Formula was derived using the analytical expression for the evaluation of the (3)He spectrum within the frame of pre-equilibrium exciton model. The systematics obtained is compared with the empirical formula for the (n,(3)He) reaction cross-section.  相似文献   
108.
109.
110.
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