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   203524篇
  免费   3255篇
  国内免费   83篇
耳鼻咽喉   1342篇
儿科学   7381篇
妇产科学   3661篇
基础医学   20573篇
口腔科学   1949篇
临床医学   15214篇
内科学   36320篇
皮肤病学   980篇
神经病学   18956篇
特种医学   9563篇
外国民族医学   3篇
外科学   32679篇
综合类   2931篇
一般理论   43篇
预防医学   20723篇
眼科学   3639篇
药学   11786篇
中国医学   660篇
肿瘤学   18459篇
  2023年   198篇
  2022年   282篇
  2021年   641篇
  2020年   397篇
  2019年   656篇
  2018年   22461篇
  2017年   17782篇
  2016年   20012篇
  2015年   1578篇
  2014年   1767篇
  2013年   2163篇
  2012年   8932篇
  2011年   23006篇
  2010年   19891篇
  2009年   12515篇
  2008年   21144篇
  2007年   23466篇
  2006年   2446篇
  2005年   4049篇
  2004年   5218篇
  2003年   5915篇
  2002年   3974篇
  2001年   584篇
  2000年   681篇
  1999年   468篇
  1998年   566篇
  1997年   526篇
  1996年   391篇
  1995年   374篇
  1994年   329篇
  1993年   301篇
  1992年   256篇
  1991年   275篇
  1990年   325篇
  1989年   234篇
  1988年   225篇
  1987年   197篇
  1986年   149篇
  1985年   165篇
  1984年   153篇
  1983年   162篇
  1982年   173篇
  1981年   137篇
  1980年   153篇
  1979年   89篇
  1978年   88篇
  1977年   84篇
  1976年   79篇
  1974年   93篇
  1973年   77篇
排序方式: 共有10000条查询结果,搜索用时 11 毫秒
51.
BACKGROUND: Sore throat is a common symptom presented to general practitioners (GPs), and there remains controversy about the appropriate use of antibiotics. AIM: To compare, in a randomized controlled trial, the effectiveness of penicillin, cefixime and placebo on symptom resolution in patients presenting with a sore throat in general practice. METHOD: Twenty-two GPs in Avon recruited 154 patients, aged 16-60 years, presenting to their GP with a sore throat, and for whom the GP would normally prescribe an antibiotic. Patients were randomized to one of three groups: penicillin V 250 mg four times a day; cefixime 200 mg daily; and placebo. Each was prescribed for five days. The main outcome measures were a diary of symptom resolution over seven days and eradication of group A beta-haemolytic streptococcus (GABHS). RESULTS: Of the 103 (67%) patients who completed symptom diaries, 40 were allocated to receive penicillin, 29 cefixime and 34 placebo. In the analysis including all patients, symptom resolution was greater by day 3 in the cefixime group than in the placebo group. Penicillin did not improve symptom resolution by day 3 compared with placebo, and cefixime was not statistically significantly different from penicillin. There were significant differences in the proportion of patients using analgesia at day 3, with the proportion being lowest in the cefixime group. The results for the subgroup of patients without GABHS were similar to those for all patients; in particular, the only statistically significant difference was between cefixime and placebo. Although numbers were too small for statistical significance, among patients with GABHS the effects of penicillin and cefixime were similarly raised in relation to placebo. CONCLUSION: Compared with placebo, cefixime can improve the rate of resolution of symptoms in patients with a sore throat who are selected for antibiotic treatment by their GP. The unexpected finding that cefixime was of benefit compared with placebo for patients without GABHS suggests that bacteria other than GABHS may be important in the pathogenesis of sore throat.  相似文献   
52.
Fine-needle cytology was obtained from 14 solid tumors in 12 children. Both aspiration and nonaspiration techniques were used and several staining methods were applied. May Grünwald Giemsa and Papanicolaou stains were preferred. The nonaspiration method yielded a superior quality cytology smear with less blood contamination. There were no complications recorded. Confirmation of the diagnosis with cytology allowed for planned management with preoperative cytotoxic chemotherapy and/or radiotherapy in 10 children, immediate surgery in one, and radiotherapy to a vertebral recurrence in one. Fine-needle cytology is considered a useful technique in the management of a selected group of children with solid tumors.  相似文献   
53.
54.
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   
55.
56.
57.
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   
58.
59.
Conclusion In the year 2003 there is no “one best bariatric operation” for every severely obese patient. The choice of operation must be tailored to each individual patient’s needs and wishes. For the superobese patient, the patient diagnosed with intestinal metaplasia of the stomach, and for those patients who do not wish to undergo the severe dietary restrictions imposed by the RNY-GB, the BPD-DS is a valuable surgical option.  相似文献   
60.
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