全文获取类型
收费全文 | 210284篇 |
免费 | 18238篇 |
国内免费 | 4527篇 |
专业分类
耳鼻咽喉 | 3269篇 |
儿科学 | 4080篇 |
妇产科学 | 3565篇 |
基础医学 | 16708篇 |
口腔科学 | 7190篇 |
临床医学 | 19380篇 |
内科学 | 20251篇 |
皮肤病学 | 2397篇 |
神经病学 | 10326篇 |
特种医学 | 5801篇 |
外国民族医学 | 12篇 |
外科学 | 20364篇 |
综合类 | 33318篇 |
现状与发展 | 9篇 |
一般理论 | 24篇 |
预防医学 | 28478篇 |
眼科学 | 1991篇 |
药学 | 20236篇 |
344篇 | |
中国医学 | 26178篇 |
肿瘤学 | 9128篇 |
出版年
2024年 | 954篇 |
2023年 | 4240篇 |
2022年 | 7975篇 |
2021年 | 10448篇 |
2020年 | 10233篇 |
2019年 | 11635篇 |
2018年 | 10144篇 |
2017年 | 8671篇 |
2016年 | 7740篇 |
2015年 | 7214篇 |
2014年 | 14156篇 |
2013年 | 14409篇 |
2012年 | 12651篇 |
2011年 | 13500篇 |
2010年 | 10890篇 |
2009年 | 9390篇 |
2008年 | 8710篇 |
2007年 | 8787篇 |
2006年 | 7461篇 |
2005年 | 6320篇 |
2004年 | 5246篇 |
2003年 | 4672篇 |
2002年 | 3602篇 |
2001年 | 2984篇 |
2000年 | 2665篇 |
1999年 | 2179篇 |
1998年 | 1739篇 |
1997年 | 1568篇 |
1996年 | 1261篇 |
1995年 | 1200篇 |
1994年 | 1096篇 |
1993年 | 977篇 |
1992年 | 884篇 |
1991年 | 815篇 |
1990年 | 703篇 |
1989年 | 689篇 |
1988年 | 636篇 |
1987年 | 573篇 |
1986年 | 525篇 |
1985年 | 1784篇 |
1984年 | 2057篇 |
1983年 | 1287篇 |
1982年 | 1706篇 |
1981年 | 1181篇 |
1980年 | 1013篇 |
1979年 | 905篇 |
1978年 | 739篇 |
1977年 | 553篇 |
1976年 | 696篇 |
1975年 | 477篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
51.
52.
目的 :探讨单纯疱疹性角膜炎是中西医联合用药的治疗方法。方法 :本组 10 0例 ( 10 6只眼 )单纯疱疹性角膜炎患者应用抗病毒药物联合清热解毒中药的疗效观察。结果 :本组病例治疗后总有效率 82 .0 8%。结论 :中西医联合治疗措施是我们对单纯疱疹性角膜炎治疗的一项新的探讨。 相似文献
53.
Fujihiko Iwata M.D. Yoshio Hanawa M.D. Hirotada Takashima M.D. Keichou Shimoura M.D. Youhei Nishibayashi M.D. 《Pediatrics international》1992,34(1):84-86
The pathogenesis and etiology of Kawasaki disease are unknown, but some studies suggest increased genetic susceptibility. The case is presented of an infant with Kawasaki disease whose father suffered from the same illness 21 years previously. The A, B and C loci of the HLA antigens were examined. 相似文献
54.
55.
LYNDA E ALBERTYN 《Journal of Medical Imaging and Radiation Oncology》1992,36(1):17-22
Both systemic and local therapy, for conditions of the breast and unrelated to it, may produce manuno-graphic changes. Some of these are characteristic, such as the pattern of scarring seen in reduction mammo-plasty. In many other instances, however, the changes produced overlap features commonly seen in malignancy. A knowledge of the timing, natural history and spectrum of these changes will aid mammographic interpretation. 相似文献
56.
Andreas Jovanovic Engelbert A.J.M. Schulten Isaäc van der Waal 《Community dentistry and oral epidemiology》1992,20(2):94-96
The referral pattern of 140 Dutch patients with oral mucosal lesions, who had been referred to a Department of Oral & Maxillofacial Surgery and Oral Pathology, shows that patients with oral mucosal lesions consult the dentist as often as the family doctor as the first source of help or information. Furthermore, family doctors were much more used to refer patients with oral mucosal disease to medical specialists rather than to the dentist or the oral and maxillofacial surgeon. 相似文献
57.
小包装全氟丙烷气体动力学实验研究 总被引:1,自引:0,他引:1
为检验塑料小包装全氟丙烷气体(C3F8)在不同包装和储存方法时浓度变化,将装有5~7mlC3F8的聚氯乙烯小袋,根据不同储藏温度和外包装方法随机分成四组:(1)22℃聚乙烯外包装,(2)36℃聚乙烯外包装,(3)22℃铝箔真空外包装,(4)-29℃聚乙烯外包装;每一组C3F8小袋气体存放一定时间后,应用气相色谱分析方法进行浓度测量。结果:第3组C3F8浓度最高和稳定,第2组浓度随放置时间降低最明显,第4组是临床应用气体的储藏和包装方法,其30天样本浓度和第3组相等,但放置一年时浓度降低。结果显示:塑料小包装C3F8予以铝箔真空外包装是一种可行的方法,利于C3F8运输和普及;聚乙烯外包装的C3F8,应放在-29℃保存,时间不超过一年。 相似文献
58.
Systolic and diastolic blood pressures were measured on 254 monozygotic (MZ) and 260 dizygotic (DZ) male twin pairs, during middle age (average age 48 years) and at two later age points. Genetic and environmental components of covariation were modeled by time series. For both measures, shared environmental influences were absent and specific environmental influences were largely time-specific. Although heritability was about 0.5 at each time point, genetic variation present at middle age contributed only about 60% to that present 9 years later, the remaining 40% being new. Fifteen years later, at the third time point, no new genetic variation was evident, variation in individual differences being entirely attributable to genetic differences laid down at the two earlier ages. © 1993 Wiley-Liss, Inc. 相似文献
59.
60.
J. C. Mathers 《Journal of human nutrition and dietetics》1988,1(3):155-161
Eleven healthy free-living adults (six women, five men) weighed and recorded all food and drink consumed and collected all urine for two non-consecutive 7-day periods whilst eating their usual diet (Period 1) and attempting to reduce salt intake (Period 2). Bread (including pitta bread) provided on average a quarter of total Na intake of subjects in Period 1 so that wholemeal bread made without added salt was made available in Period 2. All subjects achieved substantial reductions (mean 65%) in Na intake in Period 2 with no change in K intake so that the Na:K molar ratio fell from 1.3 to 0.5. Urinary Na output closely followed intakes and there was a large increase (mean 11.2 μg/d) in aldosterone excretion with a non-significant increase in K output. Simple linear relationships which allow prediction of Na and K intake from the more easily measured urinary output were derived. 相似文献