全文获取类型
收费全文 | 1204篇 |
免费 | 90篇 |
国内免费 | 48篇 |
专业分类
耳鼻咽喉 | 16篇 |
儿科学 | 28篇 |
妇产科学 | 18篇 |
基础医学 | 233篇 |
口腔科学 | 18篇 |
临床医学 | 158篇 |
内科学 | 231篇 |
皮肤病学 | 18篇 |
神经病学 | 54篇 |
特种医学 | 192篇 |
外科学 | 59篇 |
综合类 | 23篇 |
一般理论 | 35篇 |
预防医学 | 87篇 |
眼科学 | 33篇 |
药学 | 79篇 |
肿瘤学 | 60篇 |
出版年
2021年 | 15篇 |
2020年 | 13篇 |
2019年 | 14篇 |
2018年 | 11篇 |
2016年 | 12篇 |
2015年 | 16篇 |
2014年 | 22篇 |
2013年 | 43篇 |
2012年 | 45篇 |
2011年 | 51篇 |
2010年 | 22篇 |
2009年 | 24篇 |
2008年 | 44篇 |
2007年 | 67篇 |
2006年 | 39篇 |
2005年 | 44篇 |
2004年 | 26篇 |
2003年 | 39篇 |
2002年 | 44篇 |
2001年 | 35篇 |
2000年 | 36篇 |
1999年 | 47篇 |
1998年 | 45篇 |
1997年 | 43篇 |
1996年 | 39篇 |
1995年 | 28篇 |
1994年 | 23篇 |
1993年 | 33篇 |
1992年 | 36篇 |
1991年 | 19篇 |
1990年 | 20篇 |
1989年 | 27篇 |
1988年 | 27篇 |
1987年 | 16篇 |
1986年 | 32篇 |
1985年 | 28篇 |
1984年 | 16篇 |
1983年 | 18篇 |
1982年 | 20篇 |
1981年 | 13篇 |
1980年 | 9篇 |
1979年 | 9篇 |
1978年 | 11篇 |
1977年 | 18篇 |
1976年 | 12篇 |
1975年 | 11篇 |
1973年 | 12篇 |
1971年 | 7篇 |
1967年 | 6篇 |
1927年 | 6篇 |
排序方式: 共有1342条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
5.
J C H Miles G M Kendall Z-F Ibrahimi C B Howarth 《Journal of radiological protection》2004,24(2):165-171
Etched track detectors are widely used for the detection of radon and its decay products. They have many desirable attributes: they are small, cheap, simple, non-toxic and non-hazardous. Etched track detectors provide adequate accuracy for most radiological protection purposes provided stringent quality assurance is maintained. The UK validation scheme provides an important component of QA but continuous monitoring of conditions and results is also needed. If these conditions are observed, these detectors provide an entirely adequate tool for large-scale use in assessing levels of radon in houses. Accurate estimates of long-term average radon levels require a measurement over several months because of the short-term fluctuations in radon concentrations. 相似文献
6.
7.
Douglas M. Howarth Martin T. Epstein Paul A. Thomas Leonard W. Allen Rachel Akerman Linda Lan 《European journal of nuclear medicine and molecular imaging》1997,24(12):1465-1469
The efficacy of fractionated out-patient radioiodine therapy in 38 patients with compressive symptoms due to long-standing
large multinodular goitres was assessed. The diagnosis was established by clinical assessment in addition to technetium-99m
pertechnetate thyroid scan or computed tomography scan of the thyroid and mediastinum. Oral iodine-131 therapy was administered
as a 2.22 GBq (60 mCi) cumulative dose over 4 months (555 MBq per month). All patients were monitored with serum thyroid-stimulating
hormone and free thyroxine (± free tri-iodothyronine) assays before the treatment and after each dose fraction. Clinical and
biochemical follow-up was performed on all patients and ranged from 6 to 45 months after therapy. The patients consisted of
35 female and three male patients with a median age of 59 years (range 37–87 years). Prior to treatment 20 patients were biochemically
hyperthyroid and 18 were euthyroid. Overall, 71% of patients reported a subjective improvement in compressive symptoms and
29% reported no change. Clinically assessed reduction in goitre size occurred in 92% of patients while there was no change
in 8%. At 3 months of follow-up, 31% of patients had become hypothyroid and at 18 months 66% were hypothyroid. Seven hyperthyroid
patients (35%) became euthyroid and 13 hyperthyroid patients (65%) became hypothyroid. Three patients who became hypothyroid
experienced neck soreness (transient in one patient, persistent in two patients). There were no differences in outcome between
patients who were hyperthyroid and those who were euthyroid prior to treatment. Fractionated out-patient radioiodine therapy
showed excellent short- and medium-term safety, was very well tolerated and offered a satisfactory alternative treatment to
surgery.
Received 23 May and in revised form 11 August 1997 相似文献
8.
Perforated colorectal neoplasms: correlation of clinical, contrast enema, and CT examinations 总被引:2,自引:0,他引:2
Hulnick DH; Megibow AJ; Balthazar EJ; Gordon RB; Surapenini R; Bosniak MA 《Radiology》1987,164(3):611-615
Results of clinical, contrast enema (CE), and computed tomographic (CT) examinations in 39 patients with perforated colorectal neoplasms were retrospectively reviewed. Twenty patients were toxemic at initial presentation, but in only four patients was the diagnosis of perforated colorectal neoplasm initially suspected clinically. CE study was performed in 22 patients and enabled the diagnosis of perforated neoplasm in 11 cases, neoplasm alone in eight, and neither neoplasm nor perforation in three. CT was performed in 38 patients and enabled the diagnosis of perforated neoplasm in 36; pericolic phlegmon but no mass lesion was evident in two. In 16 patients, CT also demonstrated metastatic disease. Because of its reliability in establishing the diagnosis and staging the extent of the inflammatory and neoplastic disease, CT is indicated in cases of suspected or proved perforated colorectal neoplasm and in cases in which CE study findings are indeterminate or suggestive of perforated neoplasm. 相似文献
9.
10.