全文获取类型
收费全文 | 961939篇 |
免费 | 69297篇 |
国内免费 | 6724篇 |
专业分类
耳鼻咽喉 | 13095篇 |
儿科学 | 29339篇 |
妇产科学 | 26596篇 |
基础医学 | 132604篇 |
口腔科学 | 26216篇 |
临床医学 | 82817篇 |
内科学 | 190365篇 |
皮肤病学 | 19641篇 |
神经病学 | 73908篇 |
特种医学 | 38870篇 |
外国民族医学 | 364篇 |
外科学 | 148501篇 |
综合类 | 32904篇 |
现状与发展 | 21篇 |
一般理论 | 253篇 |
预防医学 | 70000篇 |
眼科学 | 21566篇 |
药学 | 70795篇 |
107篇 | |
中国医学 | 6559篇 |
肿瘤学 | 53439篇 |
出版年
2021年 | 9492篇 |
2019年 | 8549篇 |
2018年 | 11204篇 |
2017年 | 9510篇 |
2016年 | 9749篇 |
2015年 | 11967篇 |
2014年 | 16360篇 |
2013年 | 23215篇 |
2012年 | 31618篇 |
2011年 | 33498篇 |
2010年 | 21197篇 |
2009年 | 19642篇 |
2008年 | 30400篇 |
2007年 | 31466篇 |
2006年 | 31221篇 |
2005年 | 30138篇 |
2004年 | 28037篇 |
2003年 | 26867篇 |
2002年 | 26102篇 |
2001年 | 42158篇 |
2000年 | 43292篇 |
1999年 | 36824篇 |
1998年 | 10260篇 |
1997年 | 9416篇 |
1996年 | 9308篇 |
1995年 | 8636篇 |
1994年 | 8222篇 |
1993年 | 7691篇 |
1992年 | 28284篇 |
1991年 | 27050篇 |
1990年 | 26489篇 |
1989年 | 25401篇 |
1988年 | 23598篇 |
1987年 | 23209篇 |
1986年 | 22283篇 |
1985年 | 21175篇 |
1984年 | 15813篇 |
1983年 | 13484篇 |
1982年 | 8091篇 |
1979年 | 14594篇 |
1978年 | 10211篇 |
1977年 | 8628篇 |
1976年 | 8150篇 |
1975年 | 8961篇 |
1974年 | 10699篇 |
1973年 | 10183篇 |
1972年 | 9661篇 |
1971年 | 8917篇 |
1970年 | 8584篇 |
1969年 | 8025篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
Peng‐fei Lei Shi‐long Su Ling‐yu Kong Cheng‐gong Wang Da Zhong Yi‐he Hu 《Orthopaedic Surgery》2019,11(5):914-920
Three‐dimensional (3D) printing technology, virtual reality, and augmented reality technology have been used to help surgeons to complete complex total hip arthroplasty, while their respective shortcomings limit their further application. With the development of technology, mixed reality (MR) technology has been applied to improve the success rate of complicated hip arthroplasty because of its unique advantages. We presented a case of a 59‐year‐old man with an intertrochanteric fracture in the left femur, who had received a prior left hip fusion. After admission to our hospital, a left total hip arthroplasty was performed on the patient using a combination of MR technology and 3D printing technology. Before surgery, 3D reconstruction of a certain bony landmark exposed in the surgical area was first performed. Then a veneer part was designed according to the bony landmark and connected to a reference registration landmark outside the body through a connecting rod. After that, the series of parts were made into a holistic reference registration instrument using 3D printing technology, and the patient's data for bone and surrounding tissue, along with digital 3D information of the reference registration instrument, were imported into the head‐mounted display (HMD). During the operation, the disinfected reference registration instrument was installed on the selected bony landmark, and then the automatic real‐time registration was realized by HMD through recognizing the registration landmark on the reference registration instrument, whereby the patient's virtual bone and other anatomical structures were quickly and accurately superimposed on the real body of the patient. To the best of our knowledge, this is the first report to use MR combined with 3D printing technology in total hip arthroplasty. 相似文献
22.
R. Di Raimondo J. Sanz-Esporrn R. Pl I. Sanz-Martn F. Luengo F. Vignoletti J. Nuez Mariano Sanz 《Clinical oral investigations》2020,24(7):2351-2361
To evaluate the changes in alveolar contour after guided bone regeneration (GBR) with two different combinations of biomaterials in dehiscence defects arou 相似文献
23.
目的调查门诊和普通病房电脑鼠标不同时段的细菌污染情况。方法随机抽取某院门诊及普通病房的各16个电脑鼠标,分别于8∶00、10∶30、13∶00、15∶30进行采样,样本接种培养后对菌落计数并筛查多重耐药菌。结果32个鼠标共计采样128次,最高菌落数达121 CFU/cm2,平均菌落数为23.9 CFU/cm2。随着时间的推移,同一鼠标的细菌计数逐渐增多。不同时段门诊和病房的电脑鼠标菌落数比较,在10∶30、13∶00、15∶30三个时间点,病房鼠标的菌落数均高于门诊(均P≤0.05)。64个病房电脑鼠标标本中检出耐甲氧西林金黄色葡萄球菌(MRSA)和耐碳青霉烯类鲍曼不动杆菌(CRAB)各1株。结论加强鼠标日常清洁消毒及监测工作非常重要,应增加清洁消毒频率或更换长效消毒剂,加强病房环境的清洁消毒。 相似文献
24.
25.
F. Fruzzetti G. Palla A. Sbrana T. Simoncini M. R. Sessa 《Gynecological endocrinology》2020,36(10):938-940
AbstractObjective: To understand the origin of extremely high gonadotropin levels in a perimenopausal woman.Methods: A 52-year-old woman with a 2?months of amenorrhea followed spontaneous menstrual cycles recovery was referred to our outpatient clinic with elevated follicle-stimulating hormone (FSH, 483 mUI/ml), luteinizing hormone (LH, 475 mUI/ml) and prolactin (PRL, 173?ng/ml). She was known to take levosulpiride. The gonadotropin levels did not fit with the clinical features.Results: A gonadotroph tumor was ruled out. Further analysis confirmed constantly high FSH, LH and PRL levels. The measurements were repeated using different analytical platforms with different results. After serial dilutions, nonlinearity was present suggesting an immunoassay interference. After post-polyethylene glycol recovery, hormone levels appeared in the normal range. Anti-goat antibodies were recognized in the serum of the patient.Conclusions: This case report shows a case of falsely abnormal high gonadotropin and PRL levels in a woman during menopause transition. In the clinical practice the evaluation of gonadotropin profile is not recommended at this age, but the abnormal levels stimulated further evaluation. An interference in the assay due to anti-goat antibodies resulted in abnormally high level of FSH and LH. A strict collaboration between clinicians and the laboratory is needed, when laboratory findings do not correspond to clinical findings. 相似文献
26.
T. Wu L. G. Trahair M. J. Bound C. F. Deacon M. Horowitz C. K. Rayner K. L. Jones 《Diabetic medicine》2015,32(5):595-600
27.
Martin F. Shapiro 《Journal of general internal medicine》2015,30(10):1392-1393
28.
29.
Feasibility and Diagnostic Potential of Pulmonary Transit Time Measurement by Contrast Echocardiography: A Pilot Study
下载免费PDF全文
![点击此处可从《Echocardiography (Mount Kisco, N.Y.)》网站下载免费的PDF全文](/ch/ext_images/free.gif)
30.