全文获取类型
收费全文 | 3399篇 |
免费 | 220篇 |
国内免费 | 13篇 |
专业分类
耳鼻咽喉 | 44篇 |
儿科学 | 79篇 |
妇产科学 | 149篇 |
基础医学 | 336篇 |
口腔科学 | 296篇 |
临床医学 | 297篇 |
内科学 | 980篇 |
皮肤病学 | 31篇 |
神经病学 | 258篇 |
特种医学 | 138篇 |
外科学 | 348篇 |
综合类 | 65篇 |
一般理论 | 1篇 |
预防医学 | 258篇 |
眼科学 | 38篇 |
药学 | 168篇 |
肿瘤学 | 146篇 |
出版年
2021年 | 48篇 |
2019年 | 27篇 |
2018年 | 37篇 |
2017年 | 24篇 |
2016年 | 28篇 |
2015年 | 42篇 |
2014年 | 62篇 |
2013年 | 96篇 |
2012年 | 120篇 |
2011年 | 107篇 |
2010年 | 84篇 |
2009年 | 63篇 |
2008年 | 106篇 |
2007年 | 123篇 |
2006年 | 121篇 |
2005年 | 117篇 |
2004年 | 151篇 |
2003年 | 106篇 |
2002年 | 108篇 |
2001年 | 123篇 |
2000年 | 109篇 |
1999年 | 120篇 |
1998年 | 60篇 |
1997年 | 52篇 |
1996年 | 57篇 |
1995年 | 55篇 |
1994年 | 49篇 |
1993年 | 36篇 |
1992年 | 101篇 |
1991年 | 84篇 |
1990年 | 61篇 |
1989年 | 90篇 |
1988年 | 72篇 |
1987年 | 101篇 |
1986年 | 85篇 |
1985年 | 108篇 |
1984年 | 55篇 |
1983年 | 51篇 |
1982年 | 28篇 |
1981年 | 27篇 |
1980年 | 32篇 |
1979年 | 59篇 |
1978年 | 50篇 |
1977年 | 33篇 |
1976年 | 27篇 |
1974年 | 27篇 |
1973年 | 30篇 |
1971年 | 23篇 |
1969年 | 22篇 |
1919年 | 23篇 |
排序方式: 共有3632条查询结果,搜索用时 15 毫秒
71.
72.
Hodgkin lymphoma (HL) and non-Hodgkin lymphoma (NHL) often present with systemic symptoms such as fatigue, shortness of breath and night sweats, mimicking pregnancy-related features which may result in delayed disease diagnosis. Furthermore, the wish to avoid investigational imaging, aiming to protect the fetus from radiation exposure, may lead to a further delay, which does not often result in significant changes in HL clinical nature and patient outcome. In contrast, a more aggressive behavior (i.e., advanced disease stage and reproductive organ involvement) of most NHL types diagnosed in pregnancy may require urgent therapeutic intervention to prevent disease progression. 相似文献
73.
74.
Alice M. Horowitz John D. Suomi John K. Peterson Barbara L. Mathews Ronald H. Voglesong Beverly A. Lyman 《Community dentistry and oral epidemiology》1980,8(4):171-176
The benefits of a school-based plaque removal program are presented. Children in grades 5-8 were included in a study which was designed to determine the effect on oral hygiene, gingival inflammation and dental caries of removing dental plaque through supervised daily flossing and toothbrushing in school. A fluoride-free dentifrice was used. Controls did not receive instruction in plaque removal procedures nor did they engage in plaque removal activities at school. For three school years the students in the treatment group practiced daily plaque removal, supervised by trained personnel. All participants were examined initially for plaque (PHP), gingival inflammation (DHC) and dental caries (DMFS). Girls in the treatment group showed a significant reduction (28%) in mean plaque scores and, for girls and boys, the mean changes in gingivitis scores were significantly reduced (40% and 17%, respectively). Adjusted mean incremental DMF surface scores were 13 % lower in the treatment group than in the control group. The difference between groups was not statistically significant and was accounted for entirely by the findings in mesial and distal surfaces (26%). This difference approached statistical significance (P= 0.07). 相似文献
75.
76.
Non‐keratinocyte SNAP29 influences epidermal differentiation and hair follicle formation in mice 下载免费PDF全文
77.
Immunochemistry of ovine and bovine submaxillary mucins 总被引:1,自引:0,他引:1
78.
Winnie KW So Dorothy NS Chan Yan Lou Kai-Chow Choi Carmen WH Chan Kristina Shin Ava Kwong Diana TF Lee 《World Journal of Meta-Analysis》2015,3(4):193-205
AIM: To evaluate existing evidence for the association between different type of brassiere exposures and the risk of breast cancer.
METHODS: Ovid Medline, CINAHL, Cochrane Data Base of Systematic Reviews, Pubmed, Scopus, Proquest, Sciencedirect, Wiley Online Library, WanFang Data, Hong Kong Index to Chinese Periodicals, China Journal Net, Chinese Medical Current Contents, Chinese Biomedical Literature Database, China Academic Journals Full-Text database, Taiwan Electronic Periodical Services and HyRead; reference lists of published studies; original research studies published in English or Chinese examining the association between type and duration of brassiere-wearing and breast cancer risk. Data were abstracted by a first reviewer and verified by a second. Study quality was rated according to predefined criteria. “Fair” or “good” quality studies were included. Results were summarised by meta-analysis whenever adequate material was available.
RESULTS: Twelve case-control studies were included in the review. Meta-analysis showed brassiere wearing during sleep was associated with a two times of increased odds.
CONCLUSION: The present review demonstrates insufficient evidence to establish a positive association between the duration and type of brassiere wearing and breast cancer. Further research is essential; specifically, a large-scale epidemiological study of a better design is needed to examine the association between various forms of brassiere exposure in detail and breast cancer risk, with adequate control of confounding variables. 相似文献
79.
80.