全文获取类型
收费全文 | 44960篇 |
免费 | 2541篇 |
国内免费 | 82篇 |
专业分类
耳鼻咽喉 | 704篇 |
儿科学 | 2055篇 |
妇产科学 | 1117篇 |
基础医学 | 5429篇 |
口腔科学 | 2056篇 |
临床医学 | 3950篇 |
内科学 | 8912篇 |
皮肤病学 | 1215篇 |
神经病学 | 3753篇 |
特种医学 | 1567篇 |
外科学 | 7043篇 |
综合类 | 253篇 |
一般理论 | 18篇 |
预防医学 | 3024篇 |
眼科学 | 1103篇 |
药学 | 2957篇 |
中国医学 | 212篇 |
肿瘤学 | 2215篇 |
出版年
2024年 | 49篇 |
2023年 | 385篇 |
2022年 | 250篇 |
2021年 | 759篇 |
2020年 | 513篇 |
2019年 | 835篇 |
2018年 | 1488篇 |
2017年 | 1079篇 |
2016年 | 1173篇 |
2015年 | 1066篇 |
2014年 | 1243篇 |
2013年 | 2111篇 |
2012年 | 3241篇 |
2011年 | 3822篇 |
2010年 | 1780篇 |
2009年 | 1073篇 |
2008年 | 3034篇 |
2007年 | 3250篇 |
2006年 | 3161篇 |
2005年 | 3123篇 |
2004年 | 3000篇 |
2003年 | 2837篇 |
2002年 | 2640篇 |
2001年 | 916篇 |
2000年 | 1116篇 |
1999年 | 649篇 |
1998年 | 305篇 |
1997年 | 275篇 |
1996年 | 227篇 |
1995年 | 203篇 |
1994年 | 170篇 |
1993年 | 145篇 |
1992年 | 135篇 |
1991年 | 103篇 |
1990年 | 114篇 |
1989年 | 120篇 |
1988年 | 97篇 |
1987年 | 72篇 |
1986年 | 64篇 |
1985年 | 72篇 |
1984年 | 70篇 |
1983年 | 68篇 |
1982年 | 74篇 |
1981年 | 63篇 |
1980年 | 58篇 |
1979年 | 51篇 |
1978年 | 55篇 |
1977年 | 70篇 |
1976年 | 44篇 |
1975年 | 41篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
11.
12.
13.
Several cases of relapsing attacks during which the ear becomes red and patients experience a burning sensation have been reported in the literature. This combination of symptoms has been described as ‘red ear syndrome’ (RES). We report on a 7‐year‐old boy who had episodes of reddening, swelling and a burning sensation in one ear with local hyperthermia persisting for 3 years. The differential diagnosis included RES and erythromelalgia, as isolated auricular variants of erythromelalgia have been described and the symptoms are difficult to distinguish from RES. In this report, we discuss the similarities and differences between RES and erythromelalgia. 相似文献
14.
15.
16.
François Lavigne P. Culpan T. Judet P. Piriou 《European journal of orthopaedic surgery & traumatology : orthopedie traumatologie》2009,19(5):321-325
Objective Stiffness and severe deformity pose a major challenge in total knee arthroplasty. Numerous techniques have been described
to gain exposure and improve knee flexion. Tibial tubercle osteotomy provides excellent and safe exposure of the joint, although
mechanical and wound complications have been reported.
Materials and methods We present a series of 32 consecutive complex primary total replacements where an osteotomy of the tibial tubercle was utilised.
Results The patients had a mean follow-up of 2 years and 11 months. Following the procedure, with the exception of one case complicated
with deep infection, all of the patients had improved clinically. The mean postoperative range of motion had increased to
102° (give P value < 0.005) and there were no cases of delayed union or non-union. A mechanical complication related to technique occurred
in one patient; there were no other cases with a postoperative extension lag.
Conclusion In this challenging population group, we have found a tibial tubercle tuberosity osteotomy to greatly facilitate exposure
without compromising the clinical and radiographic outcome. 相似文献
17.
18.
Eser Tüfek?i Thomas E Merrill Maria R Pintado John P Beyer William A Brantley 《American journal of orthodontics and dentofacial orthopedics》2004,125(6):733-739
Teeth with white spot lesions (WSL) might be more prone to enamel loss during bracket debonding. This in vitro study compared enamel loss from teeth with (n = 14) and without (n = 14) WSL after polishing with low-speed finishing burs or disks (Sof-Lex, 3M ESPE, St Paul, Minn). Debonded surfaces were analyzed with a contact stylus profilometer, and digitized data were compared with baseline readings by using AnSur NT software (Regents, University of Minnesota, Minneapolis, Minn). Specimen surfaces were also examined with a scanning electron microscope. Two-way analysis of variance was performed to analyze the data. In teeth without WSL, the volume losses were 0.16 mm(3) for the bur group and 0.10 mm(3) for the disk group; the mean maximum depths were 47.7 microm for the bur group and 54.3 microm for the disk group. In teeth with WSL, the volume losses were 0.06 and 0.17 mm(3), and the mean maximum depths were 35.1 and 48.7 microm for the bur and disk groups, respectively. There were no significant differences in enamel loss between the 2 groups of teeth without WSL (P =.12). However, in teeth with WSL, the burs removed less enamel than the disks (P = 0.006). Scanning electron microscope examination showed that any damage on the enamel surface was usually located in the cervical third of the teeth. On most specimens, even though tooth surfaces appeared resin-free to the naked eye, there were remnants of it. The differences between groups were so small that they might be clinically insignificant. 相似文献
19.
20.