全文获取类型
收费全文 | 233435篇 |
免费 | 11133篇 |
国内免费 | 383篇 |
专业分类
耳鼻咽喉 | 3045篇 |
儿科学 | 7262篇 |
妇产科学 | 4776篇 |
基础医学 | 33509篇 |
口腔科学 | 5309篇 |
临床医学 | 18430篇 |
内科学 | 51614篇 |
皮肤病学 | 6238篇 |
神经病学 | 20793篇 |
特种医学 | 7010篇 |
外国民族医学 | 101篇 |
外科学 | 28931篇 |
综合类 | 1003篇 |
一般理论 | 62篇 |
预防医学 | 21216篇 |
眼科学 | 4551篇 |
药学 | 16438篇 |
中国医学 | 697篇 |
肿瘤学 | 13966篇 |
出版年
2023年 | 1233篇 |
2022年 | 831篇 |
2021年 | 3439篇 |
2020年 | 2061篇 |
2019年 | 3906篇 |
2018年 | 7423篇 |
2017年 | 4872篇 |
2016年 | 4858篇 |
2015年 | 5442篇 |
2014年 | 5688篇 |
2013年 | 9192篇 |
2012年 | 15985篇 |
2011年 | 15937篇 |
2010年 | 7943篇 |
2009年 | 5947篇 |
2008年 | 13702篇 |
2007年 | 14667篇 |
2006年 | 13495篇 |
2005年 | 13358篇 |
2004年 | 12524篇 |
2003年 | 11428篇 |
2002年 | 10822篇 |
2001年 | 6109篇 |
2000年 | 6199篇 |
1999年 | 5522篇 |
1998年 | 896篇 |
1997年 | 741篇 |
1996年 | 720篇 |
1992年 | 3205篇 |
1991年 | 2868篇 |
1990年 | 2734篇 |
1989年 | 2496篇 |
1988年 | 2366篇 |
1987年 | 2194篇 |
1986年 | 2090篇 |
1985年 | 1887篇 |
1984年 | 1398篇 |
1983年 | 1187篇 |
1982年 | 672篇 |
1979年 | 1205篇 |
1978年 | 847篇 |
1977年 | 797篇 |
1975年 | 798篇 |
1974年 | 984篇 |
1973年 | 995篇 |
1972年 | 935篇 |
1971年 | 919篇 |
1970年 | 860篇 |
1969年 | 905篇 |
1968年 | 787篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Eskandarifard Ebrahim Silva Rui Nobari Hadi Clemente Filipe Manuel Pérez-Gómez Jorge Figueiredo António José 《Sport Sciences for Health》2022,18(2):297-305
Sport Sciences for Health - The purposes of this study were to describe the fitness and hormonal levels according to playing time (PT) (i.e., PT during season less (PT1) or more (PT2) than 50% of... 相似文献
2.
Mesny Emmanuel Barritault Marc Izquierdo Cristina Poncet Delphine d’Hombres Anne Guyotat Jacques Jouanneau Emmanuel Ameli Roxana Honnorat Jérôme Meyronet David Ducray François 《Journal of neuro-oncology》2022,157(3):511-521
Journal of Neuro-Oncology - Molecular glioblastomas (i.e. without the histological but with the molecular characteristics of IDH-wild-type glioblastoma) frequently lack contrast enhancement, which... 相似文献
3.
4.
Thomas Behrens Calvin Ge Roel Vermeulen Benjamin Kendzia Ann Olsson Joachim Schüz Hans Kromhout Beate Pesch Susan Peters Lützen Portengen Per Gustavsson Dario Mirabelli Pascal Guénel Danièle Luce Dario Consonni Neil E. Caporaso Maria Teresa Landi John K. Field Stefan Karrasch Heinz-Erich Wichmann Jack Siemiatycki Marie-Elise Parent Lorenzo Richiardi Lorenzo Simonato Karl-Heinz Jöckel Wolfgang Ahrens Hermann Pohlabeln Guillermo Fernández-Tardón David Zaridze John R. McLaughlin Paul A. Demers Beata Świątkowska Jolanta Lissowska Tamás Pándics Eleonora Fabianova Dana Mates Vladimir Bencko Lenka Foretova Vladimír Janout Paolo Boffetta Bas Bueno-de-Mesquita Francesco Forastiere Kurt Straif Thomas Brüning 《International journal of cancer. Journal international du cancer》2023,152(4):645-660
There is limited evidence regarding the exposure-effect relationship between lung-cancer risk and hexavalent chromium (Cr(VI)) or nickel. We estimated lung-cancer risks in relation to quantitative indices of occupational exposure to Cr(VI) and nickel and their interaction with smoking habits. We pooled 14 case-control studies from Europe and Canada, including 16 901 lung-cancer cases and 20 965 control subjects. A measurement-based job-exposure-matrix estimated job-year-region specific exposure levels to Cr(VI) and nickel, which were linked to the subjects' occupational histories. Odds ratios (OR) and associated 95% confidence intervals (CI) were calculated by unconditional logistic regression, adjusting for study, age group, smoking habits and exposure to other occupational lung carcinogens. Due to their high correlation, we refrained from mutually adjusting for Cr(VI) and nickel independently. In men, ORs for the highest quartile of cumulative exposure to CR(VI) were 1.32 (95% CI 1.19-1.47) and 1.29 (95% CI 1.15-1.45) in relation to nickel. Analogous results among women were: 1.04 (95% CI 0.48-2.24) and 1.29 (95% CI 0.60-2.86), respectively. In men, excess lung-cancer risks due to occupational Cr(VI) and nickel exposure were also observed in each stratum of never, former and current smokers. Joint effects of Cr(VI) and nickel with smoking were in general greater than additive, but not different from multiplicative. In summary, relatively low cumulative levels of occupational exposure to Cr(VI) and nickel were associated with increased ORs for lung cancer, particularly in men. However, we cannot rule out a combined classical measurement and Berkson-type of error structure, which may cause differential bias of risk estimates. 相似文献
5.
Zrubka Zsombor Vékás Péter Németh Péter Dobos Ágota Hajdu Ottó Kovács Levente Gulácsi László Hibbard Judith Péntek Márta 《The European journal of health economics》2022,23(8):1341-1355
The European Journal of Health Economics - Patient activation comprises the skills, knowledge and motivation necessary for patients’ effective contribution to their care. We adapted and... 相似文献
6.
Vergunst Francis Chadi Nicholas Orri Massimiliano Brousseau-Paradis Camille Castellanos-Ryan Natalie Séguin Jean R. Vitaro Frank Nagin Daniel Tremblay Richard E. Côté Sylvana M. 《European child & adolescent psychiatry》2022,31(11):1729-1738
European Child & Adolescent Psychiatry - Substance abuse is a significant public health concern that disproportionately burdens males and low-income communities. This study examined (1)... 相似文献
7.
8.
Maciel Pires Paula Ionescu Andrei Cristian Pérez-Gracia Maria Teresa Vezzoli Elena Soares Igor Paulino Mendes Brambilla Eugenio de Almeida Neves Aline Sauro Salvatore 《Clinical oral investigations》2022,26(10):6195-6207
Clinical Oral Investigations - Evaluate the ability of current ion-releasing materials to remineralise bacteria-driven artificial caries lesions. Standardised class I cavities were... 相似文献
9.
10.