首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   267102篇
  免费   9523篇
  国内免费   6966篇
耳鼻咽喉   1855篇
儿科学   7540篇
妇产科学   4123篇
基础医学   27498篇
口腔科学   3308篇
临床医学   25007篇
内科学   44514篇
皮肤病学   1539篇
神经病学   21189篇
特种医学   12269篇
外国民族医学   61篇
外科学   37856篇
综合类   18461篇
现状与发展   31篇
一般理论   4篇
预防医学   23738篇
眼科学   5372篇
药学   19042篇
  83篇
中国医学   5809篇
肿瘤学   24292篇
  2024年   361篇
  2023年   1769篇
  2022年   4193篇
  2021年   5120篇
  2020年   3790篇
  2019年   3315篇
  2018年   24940篇
  2017年   20242篇
  2016年   22079篇
  2015年   5291篇
  2014年   6069篇
  2013年   5281篇
  2012年   13596篇
  2011年   28358篇
  2010年   23201篇
  2009年   15020篇
  2008年   23879篇
  2007年   26342篇
  2006年   5199篇
  2005年   6924篇
  2004年   6258篇
  2003年   7029篇
  2002年   4799篇
  2001年   2278篇
  2000年   2629篇
  1999年   2734篇
  1998年   1914篇
  1997年   1819篇
  1996年   1324篇
  1995年   1188篇
  1994年   1008篇
  1993年   669篇
  1992年   772篇
  1991年   709篇
  1990年   698篇
  1989年   570篇
  1988年   448篇
  1987年   404篇
  1986年   279篇
  1985年   227篇
  1984年   114篇
  1983年   99篇
  1982年   66篇
  1981年   46篇
  1980年   68篇
  1979年   35篇
  1938年   60篇
  1934年   30篇
  1932年   56篇
  1930年   46篇
排序方式: 共有10000条查询结果,搜索用时 13 毫秒
41.
Twenty five cases, including 26 eyes with retinal vein occlusion (RVO) were examined by means of the electro-oculogram. The results showed that 23 of the 26 eyes suffering from RVO exhibited abnormalities of the electro-oculogram (EOG). The potential difference and Arden ratio in the RVO eyes were lower than those in the normal eyes (P<0.01). The more the visual acuity of ill eyes was decreased, the higher the abnormal rate of EOG in ill eyes was. 14 eyes had the visual acuity less than 0.1, whose EOGs were abnortmal. Six eyes had the visual acuity from 0. 2 to 0. 4, in which the EOGs of 5 eyes were abnormal. Six eyes had the visual acuity more than 0. 5, a-mong which the EOGs of 4 eyes were abnormal. Based on the above observations, it may be considered that the circulatory disturbance resulting from RVO damages not only the internal layer but also the external layer of the retina. We suggest that EOG is a useful method for distingquishing lesions caused by RVO and may reflect the functional condition  相似文献   
42.
43.
分别采用联合火箭免疫电泳技术和酶法对49例冠心病患者和50例健康人血清载脂蛋白 A_1(apoA_1),载脂蛋白 B_(100)(apoB_(100)),以及血清总胆固醇(TC)、甘油三酯(TG),高密度脂蛋白胆固醇(HDL—ch)的含量进行了测定。结果冠心病患者血清 apoB_(100)(0.99±0.26g/L)明显高于健康人(0.62±0.18g/L);而apoA_1/apoB_(100)比值(1.22±0.35)则明显低于健康人(2.12±0.49);TC,TG,HDL-ch 的含量亦有统计学意义。提示,在预示冠心病危险因素的各种脂类及脂蛋白中,以 apoB_(100)增高 apoA_1/apoB_(100)比值降低最为灵敏,最为准确,且高于单纯测定TC,TG 和 HDL-ch。  相似文献   
44.
Four cases of microtia association with hemifacial aplasia were repaired by one-stage reconstruction. The operations included external ear reconstruction and correction of facial deformity with free vascularized dermis fat flaps. All were successful, the results were satisfied. The method and the device of the operation are described in detail. The advantages of the technique are discussed.  相似文献   
45.
周桂平 《护理研究》2007,21(32):2939-2939
皮肤慢性溃疡是较难治愈的疾病,自2003年采用橡皮生肌膏外用配合氦氖激光照射治疗皮肤溃疡取得良好疗效。现报告如下。1病例介绍[例1]病人,男,45岁。5年前因外伤致足跟部皮肤破损并感染,经各种治疗无效,伤口长年不愈,于2005年3月12日来我院就诊。查体:全身情况尚好,左足跟可见3  相似文献   
46.
Single-agent chemotherapy of metastatic breast cancer is the treatment of choice in patients with slow tumor progression and asymptomatic disease. In this patient group, the choice of drugs is based more on good tolerability than on efficacy. By contrast, symptomatic or rapidly progressing disease requires the use of highly active regimens where more weight is put on reliable antitumor activity. While anthraycline-based combination regimens have set the standard of effective treatment, the addition of docetaxel (and to a lesser extent paclitaxel) has improved tumor response, but failed to induce a consistent prolongation of survival. Based on retrospective analyses, it is hypothesised that the combined use of anthracyclines and taxanes in first-line therapy may be most beneficial in defined subgroups: after adjuvant chemotherapy, in patients with HER-2 gene amplification, possibly also in patients with rapidly progressing visceral disease.  相似文献   
47.
48.
49.
Antegrade interlocking nailing of humeral shaft fractures   总被引:5,自引:0,他引:5  
The results of 39 humeral shaft fractures (37 patients) treated with antegrade locked nailing using a Russell–Taylor nail were reviewed. There were 30 acute fractures, 6 fractures malaligned in a hanging cast or brace, and 3 pathological fractures. Patient age ranged from 26 to 80 years (average, 59.7 years) and average follow-up was 25.7 months (range, 6–48 months). Fracture union was achieved in 92.3% of our cases, while shoulder function was excellent or good in 87.2% of cases. Antegrade locked nailing offers a dependable solution for the treatment of humeral shaft fractures, especially in polytrauma patients and cases of segmental or pathological fractures. Far less satisfactory results were obtained in comminuted fractures of the proximal third in the humerus, especially in osteoporotic patients, and we therefore advocate caution with the use of intramedullary nailing in this type of fracture. Certain technical aspects such as avoiding nailing the fracture in distraction, properly countersinking the tip of the nail, and achieving adequate fixation stability have been found to be of paramount importance to reduce the incidence of delayed union/non-union rate and to obtain better functional results from the shoulder joint.  相似文献   
50.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号