全文获取类型
收费全文 | 21718篇 |
免费 | 2235篇 |
国内免费 | 44篇 |
专业分类
耳鼻咽喉 | 284篇 |
儿科学 | 609篇 |
妇产科学 | 510篇 |
基础医学 | 3605篇 |
口腔科学 | 416篇 |
临床医学 | 2310篇 |
内科学 | 4073篇 |
皮肤病学 | 274篇 |
神经病学 | 2080篇 |
特种医学 | 921篇 |
外国民族医学 | 1篇 |
外科学 | 2714篇 |
综合类 | 680篇 |
一般理论 | 11篇 |
预防医学 | 2327篇 |
眼科学 | 302篇 |
药学 | 1557篇 |
中国医学 | 55篇 |
肿瘤学 | 1268篇 |
出版年
2022年 | 134篇 |
2021年 | 268篇 |
2020年 | 204篇 |
2019年 | 310篇 |
2018年 | 395篇 |
2017年 | 281篇 |
2016年 | 301篇 |
2015年 | 389篇 |
2014年 | 503篇 |
2013年 | 734篇 |
2012年 | 1193篇 |
2011年 | 1233篇 |
2010年 | 676篇 |
2009年 | 622篇 |
2008年 | 1075篇 |
2007年 | 1095篇 |
2006年 | 1076篇 |
2005年 | 1085篇 |
2004年 | 1041篇 |
2003年 | 960篇 |
2002年 | 941篇 |
2001年 | 483篇 |
2000年 | 514篇 |
1999年 | 462篇 |
1998年 | 312篇 |
1997年 | 211篇 |
1996年 | 220篇 |
1995年 | 228篇 |
1994年 | 204篇 |
1993年 | 177篇 |
1992年 | 327篇 |
1991年 | 360篇 |
1990年 | 300篇 |
1989年 | 336篇 |
1988年 | 276篇 |
1987年 | 298篇 |
1986年 | 269篇 |
1985年 | 282篇 |
1984年 | 271篇 |
1983年 | 226篇 |
1982年 | 201篇 |
1981年 | 143篇 |
1980年 | 111篇 |
1979年 | 209篇 |
1978年 | 152篇 |
1977年 | 153篇 |
1976年 | 130篇 |
1974年 | 145篇 |
1973年 | 128篇 |
1972年 | 96篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
81.
B N Gray C Walker L Andrewartha S Freeman R C Bennett 《The Australian and New Zealand journal of surgery》1988,58(1):43-46
A controlled randomized clinical trial was undertaken to assess the ability of combined non-specific and specific immunotherapy to alter the disease-free interval and overall survival of patients with Stage B or C large bowel cancer. The immunotherapy consisted of a 2 year programme of vaccinations with BCG and neuraminidase-treated autologous tumour cells. Three hundred and one patients entered the trial. At 5 years of follow-up there is no evidence that this form of immunotherapy can alter either the disease-free interval or survival in this group of patients. 相似文献
82.
C Mavroudis S L Katzmark B L Ganzel L A Gray H C Polk 《The Annals of thoracic surgery》1988,46(6):615-618
Two hundred nine Duncan-Harley guinea pigs had intrathoracic inoculation with 10(8) Staphylococcus aureus, accompanied by blood and umbilical tape. One hundred fifty-two animals were excluded because of clinical recovery, early death, or complications related to intrathoracic polymethylmethacrylate (PMMA) bead placement. The remaining 57 animals had clinical signs of empyema thoracis and were the subjects of this study. Group I animals (N = 24) served as the controls and had no therapy. Group II animals (N = 14) were treated by intrathoracic placement of placebo PMMA beads. Group III animals (N = 19) were treated by intrathoracic placement of tobramycin sulfate-impregnated PMMA beads. There were no differences between the groups in pleural reaction or pneumonia scores. These findings demonstrate a similar host response to the established infection. Group III, however, had a higher sterilization rate than Groups I and II (p less than 0.05), a finding underlining the therapeutic effect of tobramycin-treated PMMA beads. We conclude that intrathoracic local antimicrobial therapy with slow-release tobramycin-impregnated PMMA beads may enhance empyema treatment by increasing the rate of local sterilization. More experiments are necessary to assess the efficacy of this potentially important therapeutic arm for the treatment of thoracic empyema. 相似文献
83.
84.
Cortical spreading depression in the feline brain following sustained and transient stimuli studied using diffusion-weighted imaging 总被引:1,自引:0,他引:1
85.
A comparison was made of the methods used to manage primary breast cancer in Western Australia during 1978 and 1984. It was noted that the incidence of breast-conserving surgery increased from 5% in 1978 (16 out of 313 patients) to 14% in 1984 (59 out of 431 patients). Of the 59 patients in the latter group, 37 (63%) did not receive adjuvant radiotherapy. This is a matter of concern as failure to use adjuvant radiotherapy, subsequent to breast-conserving surgery, may lead to an increased incidence of locally recurrent disease. 相似文献
86.
87.
88.
The certification program has undergone an exciting change. The AOTA leadership and AOTA members are to be applauded for making this important step. The AOTCB is still a fledgling organization; nonetheless, it has already made great strides in carrying out its mission. The AOTCB will continue to build on the very excellent foundation AOTA has laid for the certification program. The AOTCB welcomes questions, comments, and suggestions concerning the certification program. To contact AOTCB, write to AOTCB, 1383 Piccard Drive, Rockville, MD 20850-4375 or call (301) 948-9626. 相似文献
89.
A 54 year old man presented with presyncopal symptoms. Echocardiography and subsequently computed tomography showed a mass in the posterior mitral annulus causing incompetence of the valve. At operation a lipoma was found which could not be resected. Mitral incompetence was the result of chordal rupture where the lipoma had engulfed the papillary muscle. The valve was replaced and the patient made an uneventful recovery. This case report shows a potential danger of an otherwise benign lesion. 相似文献
90.