全文获取类型
收费全文 | 99284篇 |
免费 | 9474篇 |
国内免费 | 6734篇 |
专业分类
耳鼻咽喉 | 909篇 |
儿科学 | 1189篇 |
妇产科学 | 1169篇 |
基础医学 | 11067篇 |
口腔科学 | 1628篇 |
临床医学 | 12460篇 |
内科学 | 14863篇 |
皮肤病学 | 951篇 |
神经病学 | 5199篇 |
特种医学 | 3628篇 |
外国民族医学 | 59篇 |
外科学 | 10924篇 |
综合类 | 16550篇 |
现状与发展 | 25篇 |
一般理论 | 7篇 |
预防医学 | 6569篇 |
眼科学 | 2671篇 |
药学 | 10502篇 |
67篇 | |
中国医学 | 6012篇 |
肿瘤学 | 9043篇 |
出版年
2024年 | 351篇 |
2023年 | 1425篇 |
2022年 | 3611篇 |
2021年 | 4628篇 |
2020年 | 3804篇 |
2019年 | 3239篇 |
2018年 | 3423篇 |
2017年 | 3285篇 |
2016年 | 3038篇 |
2015年 | 4749篇 |
2014年 | 5827篇 |
2013年 | 5347篇 |
2012年 | 7844篇 |
2011年 | 8303篇 |
2010年 | 5575篇 |
2009年 | 4492篇 |
2008年 | 5549篇 |
2007年 | 5297篇 |
2006年 | 5034篇 |
2005年 | 4881篇 |
2004年 | 3288篇 |
2003年 | 3136篇 |
2002年 | 2608篇 |
2001年 | 2100篇 |
2000年 | 2156篇 |
1999年 | 2145篇 |
1998年 | 1315篇 |
1997年 | 1292篇 |
1996年 | 1010篇 |
1995年 | 953篇 |
1994年 | 795篇 |
1993年 | 568篇 |
1992年 | 656篇 |
1991年 | 660篇 |
1990年 | 517篇 |
1989年 | 435篇 |
1988年 | 423篇 |
1987年 | 382篇 |
1986年 | 287篇 |
1985年 | 222篇 |
1984年 | 171篇 |
1983年 | 115篇 |
1982年 | 67篇 |
1981年 | 78篇 |
1980年 | 54篇 |
1979年 | 78篇 |
1978年 | 39篇 |
1977年 | 37篇 |
1976年 | 32篇 |
1973年 | 27篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
We conducted a case-control study to assess possible factors associated with Alzheimer's disease (AD) with 70 clinically diagnosed AD patients and 140 age- and sex-matched nondemented neighborhood controls in China. Factors significantly associated with AD cases were family history of dementia in first-degree relatives, family history of psychotic disorders in first-degree relatives, and left-handedness/ambidexterity. A history of arthritis showed a significantly negative association with AD. Neither a family history for Down's syndrome, history of head trauma, nor other conditions that might support immune or viral hypotheses in AD were significantly associated with AD cases. These data support the role of familial/genetic factors in AD. 相似文献
92.
93.
介绍一种新型激光治疗装置.它利用超声波产生的雾化气体通道作为光学传导媒介,将激光束汇同雾化药雾通过患者的深呼吸一起传导至患者的呼吸道及肺部,进行治疗. 相似文献
94.
After eliminating confounding factors, the study was made on the relationship between height, collagen metabolism, hair zinc and excessive fluoride intake. 140 schoolchildren aged 12-13 years born and reared in endemic fluorosis areas were surveyed. The results were as follows: 1. The average height of children with dental fluorosis III degree (DF III degree) was appreciably smaller than that of children without dental fluorosis. Among children with excessive fluoride intake, a negative correlation between the height and fluoride level in staple foods was seen. 2. The more the fluoride ingested, the higher the urinary THP excreted, showing that fluoride intoxication interfered with the collagen metabolism. 3. Among children with excessive fluoride intake, the height showed negative correlation with urinary THP/Cr, suggesting that the effect of fluoride on collagen metabolism indicated the mechanism of height retardation. 4. As compared to control group with the excessive fluoride intake but without dental fluorosis group, there was a significant reduction in hair zinc in group with DF III degree, suggesting that the zinc in the body decreased because of zinc metabolism disturbance by excessive fluoride intake. But among cases with excessive fluoride intake, no appreciable correlation between hair zinc and height was found. Therefore, it could not be confirmed that the effect of fluoride on zinc metabolism affected the height development. 相似文献
95.
宣肺清热颗粒剂稳定性研究 总被引:1,自引:0,他引:1
目的:研究宣肺清热颗粒剂中橙皮甙热稳定性变化,为该颗粒剂有效期的确定、制剂生产、贮存条什提供实验参考依据。方法:采用加速实验法对橙皮甙热稳定性进行研究,用甲醇超声提取样品,HPLC进行含量测定。根据Arrhenius公式处理数据。结果:Arrhenius公式得室温下的速度常数K298=3.38×10-5/h,得出常温下该颗粒剂以橙皮甙为指标的有效期为3.6年。结论:宣肺清热颗粒剂稳定性好,初步符合中药稳定性要求。 相似文献
96.
Kuan-Pin Su Shih-Yi Huang Chih-Chiang Chiu Winston W Shen 《European neuropsychopharmacology》2003,13(4):267-271
Patients with depression have been extensively reported to be associated with the abnormality of omega-3 polyunsaturated fatty acids (PUFAs), including significantly low eicosapentaenoic acid and docosahexaenoic acid in cell tissue contents (red blood cell membrane, plasma, etc.) and dietary intake. However, more evidence is needed to support its relation. In this study, we conducted an 8-week, double-blind, placebo-controlled trial, comparing omega-3 PUFAs (6.6 g/day) [corrected] with placebo, on the top of the usual treatment, in 28 patients with major depressive disorder. Patients in the omega-3 PUFA group had a significantly decreased score on the 21-item Hamilton Rating Scale for Depression than those in the placebo group (P < 0.001). From the preliminary findings in this study, omega-3 PUFAs could improve the short-term course of illness and were well tolerated in patients with major depressive disorder. 相似文献
97.
98.
99.
Anatomic and spiral computed tomographic study of the genial tubercles for genioglossus advancement.
Shan Kai Yin Hong Liang Yi Wen Ying Lu Jian Guan Hong Min Wu Zhen Yu Cao Dong Zhen Yu Yan Yan Huang Chun Gen Wu 《Otolaryngology--head and neck surgery》2007,136(4):632-637
OBJECTIVE: To measure and compare Chinese mandibular genial tubercles measured anatomically and with computed tomography (CT). STUDY DESIGN AND SETTING: Spiral CT scans were taken of 40 adult human skulls; the superior genial spines were measured using anatomic and CT methods. RESULTS: The height and width of the superior genial spines, mandible thickness, and distance from the menton to the inferior and superior margins of the superior genial spines were 5.82 +/- 0.71, 6.98 +/- 1.35, 11.95 +/- 1.59, 11.08 +/- 2.05, and 16.91 +/- 2.30 mm from anatomic measurements and 6.17 +/- 0.71, 7.01 +/- 1.13, 12.19 +/- 1.64, 10.41 +/- 1.55, and 15.73 +/- 2.12 mm using spiral CT, respectively. The anatomic and CT measurements were correlated. CONCLUSION: Spiral CT of the genial tubercles can help locate the osteotomy in genioglossus advancement. SIGNIFICANCE: This study acquired reference data on Chinese genial tubercles demonstrating that CT measurements of the genial tubercles reflect their anatomy, which should allow accurately locate the osteotomy. 相似文献
100.
沈备娟 《浙江中医药大学学报》2007,31(4):519-519,522
在青年学生中吸收优秀分子已成为高校党组织发展工作的重要组成部分,最近几年来,高中党建工作也不断发展。了解青年学生党建现状,更好地利用中学党建工作成果,提出了做好衔接工作的现实意义及对策措施。 相似文献