全文获取类型
收费全文 | 3204篇 |
免费 | 171篇 |
国内免费 | 24篇 |
专业分类
耳鼻咽喉 | 18篇 |
儿科学 | 91篇 |
妇产科学 | 63篇 |
基础医学 | 474篇 |
口腔科学 | 64篇 |
临床医学 | 193篇 |
内科学 | 600篇 |
皮肤病学 | 64篇 |
神经病学 | 163篇 |
特种医学 | 172篇 |
外科学 | 463篇 |
综合类 | 379篇 |
一般理论 | 1篇 |
预防医学 | 163篇 |
眼科学 | 46篇 |
药学 | 212篇 |
中国医学 | 13篇 |
肿瘤学 | 220篇 |
出版年
2024年 | 3篇 |
2023年 | 20篇 |
2022年 | 51篇 |
2021年 | 74篇 |
2020年 | 35篇 |
2019年 | 70篇 |
2018年 | 62篇 |
2017年 | 50篇 |
2016年 | 76篇 |
2015年 | 125篇 |
2014年 | 174篇 |
2013年 | 166篇 |
2012年 | 206篇 |
2011年 | 227篇 |
2010年 | 176篇 |
2009年 | 149篇 |
2008年 | 164篇 |
2007年 | 174篇 |
2006年 | 190篇 |
2005年 | 131篇 |
2004年 | 142篇 |
2003年 | 115篇 |
2002年 | 90篇 |
2001年 | 69篇 |
2000年 | 56篇 |
1999年 | 66篇 |
1998年 | 58篇 |
1997年 | 61篇 |
1996年 | 66篇 |
1995年 | 43篇 |
1994年 | 40篇 |
1993年 | 12篇 |
1992年 | 26篇 |
1991年 | 23篇 |
1990年 | 17篇 |
1989年 | 20篇 |
1988年 | 28篇 |
1987年 | 19篇 |
1986年 | 18篇 |
1985年 | 18篇 |
1984年 | 21篇 |
1983年 | 7篇 |
1982年 | 12篇 |
1981年 | 10篇 |
1980年 | 7篇 |
1978年 | 4篇 |
1977年 | 5篇 |
1975年 | 4篇 |
1968年 | 3篇 |
1966年 | 3篇 |
排序方式: 共有3399条查询结果,搜索用时 15 毫秒
1.
2.
Sonoelasticity imaging of prostate cancer: in vitro results 总被引:2,自引:0,他引:2
3.
4.
Guntur E Luis Chee-Khuen Yong Deepak A Singh S Sengupta David SK Choon 《Journal of orthopaedic surgery and research》2007,2(1):22-10
Background
Acromioclavicular injuries are common in sports medicine. Surgical intervention is generally advocated for chronic instability of Rockwood grade III and more severe injuries. Various methods of coracoclavicular ligament reconstruction and augmentation have been described. The objective of this study is to compare the biomechanical properties of a novel palmaris-longus tendon reconstruction with those of the native AC+CC ligaments, the modified Weaver-Dunn reconstruction, the ACJ capsuloligamentous complex repair, screw and clavicle hook plate augmentation. 相似文献5.
Paul Wan Sia Heng Tin Wui Wong Wai See Cheong 《European journal of pharmaceutical sciences》2003,19(5):381-393
The melt agglomeration process of lactose powder with hydrogenated cottonseed oil (HCO) as the hydrophobic meltable binder was investigated by studying the physicochemical properties of molten HCO modified by sucrose stearates S170, S770 and S1570. The size, size distribution, micromeritic and adhesion properties of agglomerates as well as surface tension, contact angle, viscosity and specific volume of molten HCO, with and without sucrose stearates, were examined. The viscosity, specific volume and surface tension of molten HCO were found to be modified to varying extents by sucrose stearates which are available in different HLB values and melt properties. The growth of melt agglomerates was promoted predominantly by an increase in viscosity, an increase in specific volume or a decrease in surface tension of the molten binding liquid. The agglomerate growth propensity was higher with an increase in inter-particulate binding strength, agglomerate surface wetness and extent of agglomerate consolidation which enhanced the liquid migration from agglomerate core to periphery leading to an increased surface plasticity for coalescence. The inclusion of high concentrations of completely meltable sucrose stearate S170 greatly induced the growth of agglomerates through increased specific volume and viscosity of the molten binding liquid. On the other hand, the inclusion of incompletely meltable sucrose stearates S770 and S1570 promoted the agglomeration mainly via the reduction in surface tension of the molten binding liquid with declining agglomerate growth propensity at high sucrose stearate concentrations. In addition to being an agglomeration modifier, sucrose stearate demonstrated anti-adherent property in melt agglomeration process. The properties of molten HCO and melt agglomerates were dependent on the type and concentration of sucrose stearate added. 相似文献
6.
7.
8.
The magnetic resonance (MR) images of six patients with thrombosis of a dural sinus were reviewed. The diagnosis had been verified by computed tomographic scans in three patients and arteriograms in two; in the sixth patient, only MR imaging was used to confirm the clinical syndrome. In all patients, high-intensity signal was seen from the thrombus within the affected dural sinus on all echoes. This persistent signal intensity allowed intravascular clot to be distinguished from normal causes of increased signal such as flow-related enhancement (entry phenomenon) and even-echo rephasing. MR imaging demonstrated the cause of the thrombosis in three patients: two were secondary to adjacent tumors, and one was secondary to unsuspected mastoiditis. Complications such as infarction were also demonstrated. Using MR imaging, one can easily and safely diagnose thrombosis of a dural sinus. MR should be the imaging method of choice in patients suspected of having thrombosis of a dural sinus. 相似文献
9.
10.