全文获取类型
收费全文 | 93180篇 |
免费 | 6244篇 |
国内免费 | 720篇 |
专业分类
耳鼻咽喉 | 1598篇 |
儿科学 | 3730篇 |
妇产科学 | 2291篇 |
基础医学 | 10898篇 |
口腔科学 | 2806篇 |
临床医学 | 7781篇 |
内科学 | 23712篇 |
皮肤病学 | 2760篇 |
神经病学 | 7257篇 |
特种医学 | 1997篇 |
外国民族医学 | 15篇 |
外科学 | 11218篇 |
综合类 | 1927篇 |
现状与发展 | 1篇 |
一般理论 | 26篇 |
预防医学 | 9226篇 |
眼科学 | 2058篇 |
药学 | 5911篇 |
2篇 | |
中国医学 | 725篇 |
肿瘤学 | 4205篇 |
出版年
2024年 | 96篇 |
2023年 | 974篇 |
2022年 | 1690篇 |
2021年 | 3200篇 |
2020年 | 1760篇 |
2019年 | 2581篇 |
2018年 | 3531篇 |
2017年 | 2418篇 |
2016年 | 2416篇 |
2015年 | 2570篇 |
2014年 | 3389篇 |
2013年 | 4850篇 |
2012年 | 6454篇 |
2011年 | 6925篇 |
2010年 | 4069篇 |
2009年 | 3553篇 |
2008年 | 5105篇 |
2007年 | 5371篇 |
2006年 | 4949篇 |
2005年 | 5049篇 |
2004年 | 5060篇 |
2003年 | 4651篇 |
2002年 | 3957篇 |
2001年 | 2649篇 |
2000年 | 2178篇 |
1999年 | 1820篇 |
1998年 | 910篇 |
1997年 | 753篇 |
1996年 | 481篇 |
1995年 | 405篇 |
1994年 | 342篇 |
1993年 | 314篇 |
1992年 | 646篇 |
1991年 | 515篇 |
1990年 | 495篇 |
1989年 | 389篇 |
1988年 | 390篇 |
1987年 | 337篇 |
1986年 | 296篇 |
1985年 | 280篇 |
1984年 | 175篇 |
1983年 | 173篇 |
1982年 | 147篇 |
1981年 | 155篇 |
1980年 | 113篇 |
1979年 | 157篇 |
1978年 | 123篇 |
1974年 | 125篇 |
1971年 | 100篇 |
1969年 | 93篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
31.
32.
33.
José Abal Arca Isaura Parente Lamelas Raquel Almazán Ortega José Blanco Pérez María Elena Toubes Navarro Pedro Marcos Velázquez 《Archivos de bronconeumologia》2009,45(10):502-507
Background and objectiveTo analyse frequency, characteristics and patient survival with lung cancer (LC) and Common Obstructive Pulmonary Disease (COPD), comparing them with patients that do not have COPD.Material and methodsA retrospective study, of patients diagnosed by means of cytohistology. Survival was estimated by the Kaplan-Meier method. Statistical analysis was carried out using SPSS 15.0.ResultsA total of 996 patients were diagnosed, 39.8% with COPD. Mean age70±9.19 years. GOLD stages: I 18.2%, II 53.6%, III 24%, IV 4.2%. The histological types: squamous cell carcinoma 48.2%, adenocarcinoma 22%, and small cell carcinoma 22.5%. Survival was longer in the COPD group.ConclusionsLC and COPD are combined in 39.8%. Squamous cell type is more frequent and survival was longer in the COPD group. 相似文献
34.
Generoso Gómez Cruz Miguel Barrueco Ferrero Irene Aparicio Coca José Ángel Maderuelo Miguel Torrecilla García 《Archivos de bronconeumologia》2009,45(1):16-23
Background and ObjectiveSchool smoking prevention programs have never yielded the expected results. The aim of this study was to analyze the efficacy of an intensive smoking prevention program created by the educational community in which it was to be applied.Population and MethodA 3-year smoking prevention program was carried out among the students of Fuentesaúco Secondary School in Zamora, Spain. The Babilafuente Secondary School in Salamanca, Spain was the control group. The program included both prevention and treatment activities. The former were carried out in the school, in out-of-school situations, and in the community. The questionnaire of the European Smoking Prevention Framework Approach was used.ResultsA total of 417 students aged 12 to 17 years participated in the study. Of these, 54.4% belonged to the intervention group and 45.6% to the control group. Smokers represented 36.7% of the population. After the intervention smokers represented 40.1% of the Fuentesaúco students compared with 46.1% of the Babilafuente students, though the difference was not statistically significant. With respect to the cognitive determinants of smoking behavior, after the intervention significant differences in favor of the intervention group were only observed in the subjects’ perception of the behavior of their siblings, peers, and teachers.ConclusionsThe use of smoking prevention programs in schools should be reconsidered, and their evaluation should be based on educational rather than clinical criteria. Proposed changes in the program include decreasing its intensity, starting with students of an earlier age and seeking greater involvement of parents. 相似文献
35.
36.
37.
38.
39.
40.