全文获取类型
| 收费全文 | 2608265篇 |
| 免费 | 169986篇 |
| 国内免费 | 7482篇 |
专业分类
| 耳鼻咽喉 | 34458篇 |
| 儿科学 | 85304篇 |
| 妇产科学 | 71592篇 |
| 基础医学 | 364098篇 |
| 口腔科学 | 69779篇 |
| 临床医学 | 235055篇 |
| 内科学 | 516919篇 |
| 皮肤病学 | 62550篇 |
| 神经病学 | 214114篇 |
| 特种医学 | 99996篇 |
| 外国民族医学 | 736篇 |
| 外科学 | 386857篇 |
| 综合类 | 50406篇 |
| 现状与发展 | 5篇 |
| 一般理论 | 969篇 |
| 预防医学 | 196459篇 |
| 眼科学 | 56829篇 |
| 药学 | 188452篇 |
| 65篇 | |
| 中国医学 | 5341篇 |
| 肿瘤学 | 145749篇 |
出版年
| 2021年 | 20480篇 |
| 2019年 | 21423篇 |
| 2018年 | 29431篇 |
| 2017年 | 22719篇 |
| 2016年 | 26349篇 |
| 2015年 | 29553篇 |
| 2014年 | 40488篇 |
| 2013年 | 60479篇 |
| 2012年 | 80280篇 |
| 2011年 | 84550篇 |
| 2010年 | 51057篇 |
| 2009年 | 49171篇 |
| 2008年 | 79064篇 |
| 2007年 | 83897篇 |
| 2006年 | 85615篇 |
| 2005年 | 81772篇 |
| 2004年 | 78764篇 |
| 2003年 | 76085篇 |
| 2002年 | 73367篇 |
| 2001年 | 128427篇 |
| 2000年 | 131364篇 |
| 1999年 | 110525篇 |
| 1998年 | 31259篇 |
| 1997年 | 27932篇 |
| 1996年 | 28228篇 |
| 1995年 | 27388篇 |
| 1994年 | 25074篇 |
| 1993年 | 23422篇 |
| 1992年 | 85170篇 |
| 1991年 | 81571篇 |
| 1990年 | 78791篇 |
| 1989年 | 76065篇 |
| 1988年 | 69474篇 |
| 1987年 | 68003篇 |
| 1986年 | 63549篇 |
| 1985年 | 60516篇 |
| 1984年 | 44946篇 |
| 1983年 | 37945篇 |
| 1982年 | 22459篇 |
| 1981年 | 19987篇 |
| 1979年 | 38968篇 |
| 1978年 | 27442篇 |
| 1977年 | 23257篇 |
| 1976年 | 21497篇 |
| 1975年 | 22815篇 |
| 1974年 | 26790篇 |
| 1973年 | 25375篇 |
| 1972年 | 23752篇 |
| 1971年 | 21959篇 |
| 1970年 | 20184篇 |
排序方式： 共有10000条查询结果，搜索用时 15 毫秒
131.
Ester Teixidó-Compañó Albert Espelt Luis Sordo María J. Bravo Ana Sarasa-Renedo B. Iciar Indave Marina Bosque-Prous M. Teresa Brugal 《Gaceta sanitaria / S.E.S.P.A.S》2018,32(1):41-47
Objective
To determine differences between men and women in hazardous drinking, heavy cannabis use and hypnosedative use according to educational level and employment status in the economically active population in Spain.Method
Cross-sectional study with data from 2013 Spanish Household Survey on Alcohol and Drugs on individuals aged 25-64 [n = 14,113 (women = 6,171; men = 7,942)]. Dependent variables were hazardous drinking, heavy cannabis use and hypnosedative consumption; the main independent variables were educational level and employment situation. Associations between dependent and independent variables were calculated with Poisson regression models with robust variance. All analyses were stratified by sex.Results
Hazardous drinking and heavy cannabis use were higher in men, while women consumed more hypnosedatives. The lower the educational level, the greater the gender differences in the prevalence of this substances owing to different consumption patterns in men and women. While men with a lower educational level were higher hazardous drinkers [RII = 2.57 (95%CI: 1.75-3.78)] and heavy cannabis users [RII = 3.03 (95%CI: 1.88-4.89)] compared to higher educational level, in women the prevalence was the same. Women with a lower education level and men with a higher education level had higher hypnosedative consumption. Unemployment was associated with increased heavy cannabis use and hypnosedative use in both women and men and with lower hazardous drinking only in women.Conclusions
There are differences between men and women in the use of psychoactive substances that can be explained by the unequal distribution of substance use in them according to educational level. Unemployment was associated with substance use in both men and women. 相似文献132.
133.
134.
135.
Chhavi Raj Bhatt Mary Redmayne Michael J. Abramson Malcolm R. Sim Christopher Brzozek Berihun M. Zeleke Geza Benke 《Australasian physical & engineering sciences in medicine / supported by the Australasian College of Physical Scientists in Medicine and the Australasian Association of Physical Sciences in Medicine》2018,41(4):985-991
The aims of this study were to evaluate the weekly and annual cumulative radiofrequency-electromagnetic field (RF-EMF) exposure attributed to mobile phone (MP) use, and assess whether a novel app (Quanta Monitor?) could be employed in a small human sample to characterise the RF-EMF exposures associated with the use of MPs. Ten participants provided their two months’ daily objective data on their MP exposures (i.e. transmitted and received power densities) attributed to different modes of MP usage such as cellular calls, cellular data and Wi-Fi. The results demonstrated that total transmitted power density (cellular phone calls, data and Wi-Fi surfing) could be many orders of magnitude higher than that from the total received power density. Of the total transmitted power density, cellular data use contributed the largest portion. Our study showed that Quanta Monitor? could be employed in prospective assessment of exposures to MPs in epidemiological studies. 相似文献
136.
137.
138.
139.