全文获取类型
收费全文 | 1795254篇 |
免费 | 145991篇 |
国内免费 | 3416篇 |
专业分类
耳鼻咽喉 | 23870篇 |
儿科学 | 57947篇 |
妇产科学 | 50030篇 |
基础医学 | 252043篇 |
口腔科学 | 51099篇 |
临床医学 | 160915篇 |
内科学 | 354937篇 |
皮肤病学 | 36905篇 |
神经病学 | 149891篇 |
特种医学 | 73344篇 |
外国民族医学 | 487篇 |
外科学 | 274511篇 |
综合类 | 41909篇 |
现状与发展 | 4篇 |
一般理论 | 701篇 |
预防医学 | 136984篇 |
眼科学 | 41180篇 |
药学 | 134219篇 |
2篇 | |
中国医学 | 3250篇 |
肿瘤学 | 100433篇 |
出版年
2019年 | 14659篇 |
2018年 | 19794篇 |
2017年 | 15327篇 |
2016年 | 16929篇 |
2015年 | 19755篇 |
2014年 | 27531篇 |
2013年 | 40806篇 |
2012年 | 56774篇 |
2011年 | 59688篇 |
2010年 | 34838篇 |
2009年 | 33199篇 |
2008年 | 56320篇 |
2007年 | 59232篇 |
2006年 | 59697篇 |
2005年 | 58215篇 |
2004年 | 56879篇 |
2003年 | 53884篇 |
2002年 | 52417篇 |
2001年 | 77345篇 |
2000年 | 79551篇 |
1999年 | 68081篇 |
1998年 | 20026篇 |
1997年 | 18184篇 |
1996年 | 17944篇 |
1995年 | 17487篇 |
1994年 | 16376篇 |
1993年 | 15511篇 |
1992年 | 56259篇 |
1991年 | 54539篇 |
1990年 | 53194篇 |
1989年 | 51436篇 |
1988年 | 47768篇 |
1987年 | 47061篇 |
1986年 | 44818篇 |
1985年 | 43407篇 |
1984年 | 32793篇 |
1983年 | 28222篇 |
1982年 | 16988篇 |
1981年 | 15258篇 |
1979年 | 30850篇 |
1978年 | 21496篇 |
1977年 | 18149篇 |
1976年 | 17058篇 |
1975年 | 17847篇 |
1974年 | 21755篇 |
1973年 | 20901篇 |
1972年 | 18998篇 |
1971年 | 17896篇 |
1970年 | 16379篇 |
1969年 | 15339篇 |
排序方式: 共有10000条查询结果,搜索用时 312 毫秒
151.
O.R. Mitchell R. Dave J. Bekker P.A. Brennan 《The British journal of oral & maxillofacial surgery》2021,59(3):384-385
The first COVID-19 vaccination was given in December 2020 and there is an effort to vaccinate the international population on a massive scale. Common side effects from the vaccine include headache and tiredness. Regional lymphadenopathy has been described in relation to other vaccines. We describe two cases of supraclavicular reactive lymphadenopathy presenting in patients who had the COVID vaccination in the ipsilateral arm. Awareness of this diagnosis is important for patients presenting to the neck lump clinic. 相似文献
152.
153.
154.
Objectives:To reassess the long-term camouflage effects of resin infiltration (Icon, DMG, Hamburg, Germany) of white spot lesions (WSL) and sound adjacent enamel (SAE) achieved in a previous trial. The null hypothesis was tested that there were no significantly different CIE-L*a*b*-ΔE-values between WSL and SAE areas of assessment after at least 24 months (T24) compared to those at baseline (T0).Materials and Methods:Of twenty subjects who received previous resin infiltration treatment of nteeth = 111 nonrestored, noncavitated postorthodontic WSL after multibracket treatment during a randomized controlled trial and were contacted 20 months after baseline, eight subjects (trial teeth nteeth = 40; m/f ratio 1/7; age range (mean; SD) 12–17 [15.25; 2.12] years); response rate: 40%) were available for follow-up after at least 24 months (T24). CIE-L*a*b* differences between summarized color and lightness values (ΔEWSL/SAE) of WSL and SAE were assessed using a spectrophotometer and compared to baseline data assessed prior to infiltration (T0), and those after 6 (T6), and 12 (T12) months using paired t tests at a significance level of α = 5%.Results:T24 assessments were performed after a mean 33.86 (SD: 8.64; Min: 24; Max: 45) months following T0. Mean (SD) ΔEWSL/SAE units of available teeth were 8.76 (5.33) at baseline; 5.5 (2.75) at T6; 5.2 (2.41) at T12; and 5.57 (2.6) at T24. Comparisons of T6, T12, and T24 with T0 yielded highly significant differences, whereas T6–T24 and T12–T24 differences were found to be not significant.Conclusions:Assimilation of infiltrated WSL to the color of adjacent enamel by resin infiltration is considered to be suitable for the long-term improvement in the esthetic appearance of postorthodontic WSL. 相似文献
155.
Yang Chih-Hsiang Wang Shirlene Wang Wei-Lin Belcher Britni R. Dunton Genevieve F. 《Journal of behavioral medicine》2022,45(5):702-715
Journal of Behavioral Medicine - Understanding associations between mothers’ and children’s physical activity and sedentary behavior on more fine-grained timescales can provide insights... 相似文献
156.
157.
158.
W. Do T. Elzerman R. de Bree A. Rosenberg T. Forouzanfar E.M. Van Cann 《International journal of oral and maxillofacial surgery》2021,50(5):591-597
The aim of this study was to analyse the effect of body mass index (BMI), both low and high values, on the perioperative complication rate in patients with oral squamous cell carcinoma (OSCC). The medical records of 259 patients operated between 2014 and 2017 for OSCC were reviewed. Univariate and multivariate analyses were performed. Sixty of the 259 patients developed 87 complications. Low or high BMI was not associated with the perioperative complication rate. A longer operating time and increased blood loss were associated with a higher perioperative complication rate and higher Clavien–Dindo grade. Low BMI, American Society of Anesthesiologists score 2 and 3, a longer operating time, and increased blood loss were associated with a longer hospital stay. Low BMI was associated with a longer hospital stay. Neither low nor high BMI was associated with the perioperative complication rate. A longer operating time and increased blood loss were associated with a higher perioperative complication rate and higher Clavien–Dindo grade. 相似文献
159.