全文获取类型
收费全文 | 1480235篇 |
免费 | 122979篇 |
国内免费 | 8870篇 |
专业分类
耳鼻咽喉 | 18903篇 |
儿科学 | 47336篇 |
妇产科学 | 41592篇 |
基础医学 | 208051篇 |
口腔科学 | 38864篇 |
临床医学 | 135065篇 |
内科学 | 293456篇 |
皮肤病学 | 33921篇 |
神经病学 | 120302篇 |
特种医学 | 56782篇 |
外国民族医学 | 503篇 |
外科学 | 218125篇 |
综合类 | 48251篇 |
现状与发展 | 17篇 |
一般理论 | 502篇 |
预防医学 | 115629篇 |
眼科学 | 32980篇 |
药学 | 106731篇 |
83篇 | |
中国医学 | 8354篇 |
肿瘤学 | 86637篇 |
出版年
2021年 | 14233篇 |
2019年 | 13826篇 |
2018年 | 18893篇 |
2017年 | 14963篇 |
2016年 | 16318篇 |
2015年 | 19440篇 |
2014年 | 26823篇 |
2013年 | 37662篇 |
2012年 | 51636篇 |
2011年 | 54905篇 |
2010年 | 33095篇 |
2009年 | 31197篇 |
2008年 | 48863篇 |
2007年 | 51334篇 |
2006年 | 51616篇 |
2005年 | 49723篇 |
2004年 | 46438篇 |
2003年 | 44086篇 |
2002年 | 42213篇 |
2001年 | 74529篇 |
2000年 | 75910篇 |
1999年 | 62643篇 |
1998年 | 17735篇 |
1997年 | 16143篇 |
1996年 | 16144篇 |
1995年 | 15292篇 |
1994年 | 13765篇 |
1993年 | 12856篇 |
1992年 | 46052篇 |
1991年 | 43647篇 |
1990年 | 41652篇 |
1989年 | 39704篇 |
1988年 | 36291篇 |
1987年 | 35455篇 |
1986年 | 32940篇 |
1985年 | 31349篇 |
1984年 | 23859篇 |
1983年 | 20050篇 |
1982年 | 12226篇 |
1981年 | 10799篇 |
1979年 | 20712篇 |
1978年 | 14580篇 |
1977年 | 12085篇 |
1976年 | 11367篇 |
1975年 | 11619篇 |
1974年 | 13990篇 |
1973年 | 13535篇 |
1972年 | 12637篇 |
1971年 | 11473篇 |
1970年 | 10913篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
32.
Jamie C. Capuzza 《Journal of Children and Media》2020,14(3):324-342
ABSTRACT This project examined 55 picture books featuring transgender, gender expansive or genderqueer protagonists or narrators published between 2008 and 2018. The purpose of the study was to determine how this genre of children’s literature supports and challenges four gender assumptions: the gender binary, gender essentialism, sex/gender congruency and gender stability. Additionally, this critical analysis explored misgendering within this genre and themes of social rejection and acceptance. Protagonists and narrators were permitted a degree of gender nonconformity, however, the majority of picture books missed opportunities for a more complete exploration of gender possibilities. 相似文献
33.
目的:通过对颈椎病患者上下终板弧形高度、椎间隙高度与椎间隙后骨赘的影像学测量,研究其相关性及其临床应用价值。方法:收集2017年9月至2018年9月颈椎病手术108例患者的临床资料,男48例,年龄30~72岁,平均52岁,女60例,年龄37~79岁,平均54岁。其中C2,3 6例,C3,4 15例,C4,5 32例,C5,6 42例,C6,7 13例。术前及术后摄颈椎X线片,利用PACS(Picture Archiving and Communication Systems)调阅影像,测量椎间隙的下上终板弧形高度(L1,L2),椎间隙高度(L3)及后方骨赘的宽度(L4)。利用Spearman分析它们之间的相关性。结果:L1与L4对比(r=-0.34,P<0.05),L3与L4对比(r=-0.36,P<0.05),存在负相关。L1与L3对比(r=0.38,P<0.05),L2与L3对比(r=0.48,P<0.05),存在正相关。L1与L2对比(P>0.05),L2与L4对比(P>0.05),差异无统计学意义。结论:下终板弧形高度与椎间隙后缘骨赘宽度呈负相关,通过其测量可明确颈椎退变程度,对颈椎病的早期防治有指导意义。 相似文献
34.
35.
36.
37.
Feng Wang Dachuan Wang Bingyi Tan Jun Dong Rongjie Feng Zenong Yuan Naiguo Wang 《Medicine》2015,94(39)
The present study aimed at examining the curative effect of modified posterior operation on treatment of Kümmell''s disease.About 30 patients of Kümmell''s disease with complete image and clinical data treated during June 2004 to July 2013 were conducted with anterior and posterior approaches, respectively. Kyphotic Cobb angle, fractured vertebra wedge angle, and the anterior and posterior heights of fractured vertebra were all measured through x-ray before and after operation, and the pain visual analog scale (VAS) was determined for evaluating the effect of operations. The injury and restoration of neurological function were assessed using Frankel classification.Patients in group A were treated with anterior operation, whereas group B was posterior operation. Postoperatively, VAS score, kyphotic Cobb angle, anterior vertebra height, and pathologic vertebra wedge angle were all significantly improved in patients with Kümmell''s disease receiving modified posterior operation (group B). Similar results were also observed in patients with anterior operation. The improvement of VAS and correction rate of kyphotic Cobb angle indicated equivalent effects of posterior and anterior operations. Meanwhile, alleviated neurological function damage was observed in 2 groups. Relevant factor analysis illustrated that there was no significant correlation of the severity and improvement rate of pain symptoms with age, medical history, anterior and posterior vertebra heights, kyphotic Cobb angle, and pathological vertebra wedge angle.Compared with traditional anterior approach, modified posterior operation, adopting transpedicular vertebral body grafting combined with vertebral pedicle screw fixation, could produce equivalent effects on kyphosis correction, pain relief, and improvement of neurological function in patients with Kümmell''s disease. 相似文献
38.
There is a sharp difference in how one views TCR structure–function–behaviour dependent on whether its recognition of major histocompatibility complex‐encoded restriction elements (R) is germline selected or somatically generated. The generally accepted or Standard model is built on the assumption that recognition of R is by the V regions of the αβ TCR, which is not driven by allele specificity, whereas the competing model posits that recognition of R is allele‐specific. The establishing of allele‐specific recognition of R by the TCR would rule out the Standard model and clear the road to a consideration of a competing construct, the Tritope model. Here, the case for allele‐specific recognition (germline selected) is detailed making it obvious that the Standard model is untenable. 相似文献
39.
40.