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   2448479篇
  免费   171753篇
  国内免费   4808篇
耳鼻咽喉   33008篇
儿科学   80049篇
妇产科学   66987篇
基础医学   348766篇
口腔科学   70913篇
临床医学   221173篇
内科学   469545篇
皮肤病学   55724篇
神经病学   189556篇
特种医学   93412篇
外国民族医学   437篇
外科学   369555篇
综合类   53879篇
现状与发展   5篇
一般理论   757篇
预防医学   179899篇
眼科学   57934篇
药学   184942篇
  13篇
中国医学   6179篇
肿瘤学   142307篇
  2021年   18318篇
  2019年   18978篇
  2018年   27538篇
  2017年   21156篇
  2016年   23510篇
  2015年   26608篇
  2014年   36719篇
  2013年   53773篇
  2012年   74136篇
  2011年   78143篇
  2010年   46339篇
  2009年   43301篇
  2008年   72398篇
  2007年   77277篇
  2006年   77922篇
  2005年   74479篇
  2004年   71634篇
  2003年   68433篇
  2002年   65890篇
  2001年   127878篇
  2000年   130887篇
  1999年   108549篇
  1998年   28395篇
  1997年   24844篇
  1996年   24928篇
  1995年   23820篇
  1994年   21744篇
  1993年   20320篇
  1992年   81983篇
  1991年   79073篇
  1990年   76852篇
  1989年   73760篇
  1988年   67051篇
  1987年   65332篇
  1986年   61747篇
  1985年   58523篇
  1984年   42854篇
  1983年   36477篇
  1982年   20482篇
  1979年   38162篇
  1978年   26239篇
  1977年   22828篇
  1976年   20709篇
  1975年   22520篇
  1974年   26906篇
  1973年   25929篇
  1972年   24216篇
  1971年   22606篇
  1970年   20904篇
  1969年   19769篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
H Sasaki  K Sudoh  K Hamada  T Hamada  K Tashiro 《Neurology》1987,37(7):1258-1262
We studied two patients with nonfamilial olivopontocerebellar atrophy with skeletal myoclonus. Palatal or skeletal myoclonus is probably not a coincidental finding but another manifestation of the underlying disease. In both cases, the myoclonus was suppressed by administration of trihexyphenidyl, indicating a cholinergic disorder.  相似文献   
992.
Reported in this paper are postoperative results recorded from 120 patients, 3 years after selective proximal vagotomy for uncomplicated duodenal ulcer. There was no intraoperative lethality and no recurrence in 96.7 per cent of all cases, while Visick grades I on II were recorded from 98.2 per cent. Radiologically and gastroscopically detected pathological processes receded soon. Average postoperative reduction in acid secretion was 66.2 per cent in BAO and 46.8 per cent in MAO. Acid values re-increased thereafter, and three years later reduction rates still amounted to 43.7 per cent in BAO and 28.6 per cent in MAO. Indications for proximal gastric vagotomy are discussed in some detail.  相似文献   
993.
994.
Experience with the 'skew flap' below-knee amputation   总被引:3,自引:0,他引:3  
A review of 353 lower limb amputations over the last 7 years has been performed to assess the results of the skew flap myoplastic below-knee amputation which was introduced in April 1983 because of reported advantages in terms of wound healing and earlier ambulation. Comparing the first 3 1/2 year period with the second, the total number of amputations decreased by 31 per cent. The number of above-knee amputations remained similar in the two periods (82,62), whilst the number of Gritti-Stokes amputations fell from 79 to 21 (0.001 greater than P greater than 0.01). The proportion of below-knee (BK) amputations increased from 50 (23.7 per cent) to 59 (41.5 per cent) (0.01 greater than P greater than 0.025). The groups were comparable in terms of previous vascular surgery and co-existing medical conditions. The time to full stump healing was significantly shorter in the skew flap group compared with the earlier Burgess type BK amputation (P = 0.001), and there was a trend to fewer stump failures in the skew flap group. We therefore feel that the skew flap amputation gives superior results to the Burgess BK amputation in terms of healing and a lower complication rate, allowing a higher proportion of BK amputations to be performed. A prospective randomized trial of the two techniques is in hand to determine the accuracy of this hypothesis.  相似文献   
995.
Topical analgesia for relief of post-circumcision pain   总被引:1,自引:0,他引:1  
  相似文献   
996.
997.
Three evaluation instruments (global, check-list, and criterion referenced) were used by experienced and inexperienced examiners to evaluate dental sealant end products on 40 extracted teeth. Intra- and interexaminer reliabilities were measured. Experienced examiners achieved higher intrarater reliabilities with all three evaluation instruments than did inexperienced examiners. The highest intraexaminer agreement for all examiners occurred with use of the global evaluation. The highest interexaminer reliability was achieved with the second use of the criterion-referenced evaluation by the experienced examiner. Interexaminer reliability was improved for both types of examiners with the criterion-referenced evaluation.  相似文献   
998.
For a variety of reasons, the past few years have brought about a tremendous emphasis on conditions affecting the temporomandibular joint and associated structures. Although important advances are being made relative to the diagnosis and treatment of these conditions, a myriad of problems remain for the practitioner who tries to sort through the literature or who attends courses in order to determine a means for properly diagnosing and treating these patients. This article attempts to develop correlations between certain clinical and radiographic findings documented by histologic evaluation as a beginning guide to more sound diagnosis.  相似文献   
999.
A 65-year-old man with spontaneous rupture of the esophagus survived with a direct suture of the esophagus 15 hours after the onset of symptoms. Endoscopic examination of the esophagus was especially of great help in determining the surgical procedure in this patient, and we want to stress the importance of prompt diagnosis and immediate surgery for this disease.  相似文献   
1000.
A two-week elective to introduce first- and second-year medical students to primary care internal medicine was developed and evaluated. Course time is divided between conference sessions (25 percent) provided by full-time clinical faculty members and office experience (75 percent) provided by volunteer clinical faculty members (general internists in private practice and in prepaid health plans). Evaluations by the students (n = 58) who took the elective consisted of a questionnaire assessment of the conference session topics, the student's ability to carry out course objectives, and the preceptor's teaching activities. The conference topics were highly rated, with a mean score of 4.1 on a rating scale ranging from 1 (unfavorable) to 5 (favorable). The course objectives and teaching activities were also well rated, with a mean score of 4.1 and 3.9, respectively, on a rating scale ranging from 1 (none) to 5 (outstanding).  相似文献   
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