全文获取类型
收费全文 | 3537017篇 |
免费 | 307849篇 |
国内免费 | 16164篇 |
专业分类
耳鼻咽喉 | 48128篇 |
儿科学 | 112640篇 |
妇产科学 | 92277篇 |
基础医学 | 558778篇 |
口腔科学 | 96374篇 |
临床医学 | 337069篇 |
内科学 | 623646篇 |
皮肤病学 | 92833篇 |
神经病学 | 306541篇 |
特种医学 | 136488篇 |
外国民族医学 | 392篇 |
外科学 | 536546篇 |
综合类 | 106495篇 |
现状与发展 | 58篇 |
一般理论 | 2304篇 |
预防医学 | 308709篇 |
眼科学 | 80942篇 |
药学 | 241249篇 |
27篇 | |
中国医学 | 10489篇 |
肿瘤学 | 169045篇 |
出版年
2021年 | 56298篇 |
2020年 | 37398篇 |
2019年 | 59000篇 |
2018年 | 75033篇 |
2017年 | 58325篇 |
2016年 | 63982篇 |
2015年 | 77960篇 |
2014年 | 113069篇 |
2013年 | 179008篇 |
2012年 | 101139篇 |
2011年 | 102312篇 |
2010年 | 121856篇 |
2009年 | 126135篇 |
2008年 | 87990篇 |
2007年 | 90855篇 |
2006年 | 101510篇 |
2005年 | 96187篇 |
2004年 | 97132篇 |
2003年 | 87384篇 |
2002年 | 76887篇 |
2001年 | 108195篇 |
2000年 | 101309篇 |
1999年 | 100232篇 |
1998年 | 66582篇 |
1997年 | 64213篇 |
1996年 | 61858篇 |
1995年 | 57329篇 |
1994年 | 51289篇 |
1993年 | 47875篇 |
1992年 | 71062篇 |
1991年 | 68127篇 |
1990年 | 64704篇 |
1989年 | 62985篇 |
1988年 | 58590篇 |
1987年 | 57155篇 |
1986年 | 54548篇 |
1985年 | 54394篇 |
1984年 | 49343篇 |
1983年 | 44960篇 |
1982年 | 42069篇 |
1981年 | 39640篇 |
1980年 | 37251篇 |
1979年 | 40815篇 |
1978年 | 35963篇 |
1977年 | 32500篇 |
1976年 | 30331篇 |
1975年 | 28579篇 |
1974年 | 30057篇 |
1973年 | 28940篇 |
1972年 | 27098篇 |
排序方式: 共有10000条查询结果,搜索用时 11 毫秒
81.
Phoebe Hammer Kevin White Stephanie Mengden Vessy Korcheva Philipp W. Raess 《Journal of cutaneous pathology》2019,46(5):343-346
Cutaneous leiomyomas are rare benign smooth‐muscle tumors. These lesions are distinguished based on their cell of origin and are subclassified as pilar leiomyoma, angioleiomyoma, and genital‐type leiomyoma. Nipple leiomyoma is the least common genital‐type leiomyoma, arising from the dartoic muscle cell of the nipple. Histologic examination of the lesion is necessary for definitive diagnosis, and these uncommon tumors can pose a diagnostic challenge. We describe herein a series of six nipple leiomyomas with a spectrum of histologic appearances. 相似文献
82.
Kuo-yi Jade Chang MHealthEc MHM BSc Lisa Lorraine Dillon MSpecEd BPsych Lil Deverell COMS PhD MEd GradDipO&M BEd Mei Ying Boon PhD BOptom FAAO Lisa Keay PhD MPH BOptom 《Clinical & experimental optometry》2020,103(4):434-448
Despite orientation and mobility (O&M) being a significant factor determining quality of life of people with low vision or blindness, there are no gold standard measures or agreement on how to measure O&M performance. In the first part of this systematic review, an inventory of O&M outcome measures used by recent studies to assess the performance of orientation and/or mobility of adults with vision impairment (low vision and blindness) is presented. A wide variety of O&M outcome measures have been implemented in different fields of study, such as epidemiologic research and interventional studies evaluating training, assistive technology, vision rehabilitation and vision restoration. The most frequent aspect of outcome measures is efficiency such as time, distance, speed and percentage of preferred walking speed, followed by obstacle contacts and avoidance, and dis/orientation and veering. Other less commonly used aspects are target identification, safety and social interaction and self-reported outcome measures. Some studies employ sophisticated equipment to capture and analyse O&M performance in a laboratory setting, while others carry out their assessment in real-world indoor or outdoor environments. In the second part of this review, the appropriateness of implementing the identified outcome measures to assess O&M performance in clinical and functional O&M practice is evaluated. Nearly a half of these outcome measures meet all four criteria of face validity (either clinical or functional), responsiveness, reliability and feasibility and have the potential to be implemented in clinical or functional O&M practice. The findings of this review confirm the complicated and dynamic nature of O&M. Multiple measures are required in any evaluation of O&M performance to facilitate holistic assessment of O&M abilities and limitations of each individual. 相似文献
83.
84.
85.
86.
87.
Tonya J.H. White 《Journal of the American Academy of Child and Adolescent Psychiatry》2019,58(11):1042-1050
88.
Jeffrey J. Silbiger 《Echocardiography (Mount Kisco, N.Y.)》2019,36(5):954-957
Secondary tricuspid regurgitation (TR) caused by right ventricular enlargement in the setting of left heart disease/pulmonary hypertension has been well described. In contrast, that associated with right atrial enlargement—atrial functional TR (AF‐TR)—remains largely underappreciated. AF‐TR most often occurs in the setting of lone atrial fibrillation, although it is also seen in its absence (idiopathic AF‐TR). Several recent studies have found that the prevalence, hemodynamic significance, and prognosis of AF‐TR are not inconsequential, suggesting increased physician awareness of this novel clinical entity is warranted. This article discusses the pathogenesis, echocardiographic findings, and treatment of this underappreciated cause of secondary TR. 相似文献
89.
Noreen M. Walsh Heinz Kutzner Luis Requena Lorenzo Cerroni 《Journal of cutaneous pathology》2019,46(9):698-708
We review the spectrum of cutaneous disorders associated with inflammatory and neoplastic plasmacytic pathology. Because plasma cells are derived from B‐lymphocytes our overview includes discussion of certain lymphoplasmacytic proliferations. It is structured along histopathological lines, addressing conditions characterized by (a) cutaneous plasma cell infiltrates, (b) deposits of plasma cell products or their derivatives in the skin and (c) miscellaneous, poorly understood cutaneous complications of plasmacytic disorders. Lesions arising primarily in the skin and those due to cutaneous involvement by multisystem disorders are addressed. The range includes a spectrum of tumefactive and circulatory manifestations. We highlight key clinical and pathological features of the different conditions and outline recent advances in our understanding of these entities. By emphasizing the dermatopathological characteristics of this spectrum of disorders we hope to hone the diagnostic accuracy of practitioners in the field. 相似文献
90.