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   1099835篇
  免费   84378篇
  国内免费   2798篇
耳鼻咽喉   13936篇
儿科学   37376篇
妇产科学   30602篇
基础医学   161423篇
口腔科学   30553篇
临床医学   99168篇
内科学   214281篇
皮肤病学   24651篇
神经病学   89282篇
特种医学   42711篇
外国民族医学   313篇
外科学   162415篇
综合类   24163篇
现状与发展   1篇
一般理论   485篇
预防医学   90190篇
眼科学   24294篇
药学   77967篇
  3篇
中国医学   2234篇
肿瘤学   60963篇
  2019年   9053篇
  2018年   12730篇
  2017年   10072篇
  2016年   11393篇
  2015年   12852篇
  2014年   17483篇
  2013年   26012篇
  2012年   35301篇
  2011年   37163篇
  2010年   21811篇
  2009年   20906篇
  2008年   34264篇
  2007年   36188篇
  2006年   36441篇
  2005年   34851篇
  2004年   33332篇
  2003年   31969篇
  2002年   30630篇
  2001年   50357篇
  2000年   51440篇
  1999年   43313篇
  1998年   12504篇
  1997年   11186篇
  1996年   11253篇
  1995年   10709篇
  1994年   9950篇
  1993年   9235篇
  1992年   34382篇
  1991年   33427篇
  1990年   32827篇
  1989年   31636篇
  1988年   28767篇
  1987年   28717篇
  1986年   26769篇
  1985年   25887篇
  1984年   19307篇
  1983年   16307篇
  1982年   9716篇
  1981年   8761篇
  1979年   17598篇
  1978年   12664篇
  1977年   10680篇
  1976年   10032篇
  1975年   10469篇
  1974年   12673篇
  1973年   12204篇
  1972年   11206篇
  1971年   10425篇
  1970年   9633篇
  1969年   8958篇
排序方式: 共有10000条查询结果,搜索用时 390 毫秒
81.
82.
We report a case of intestinal obstruction in a 73-year-old woman caused by ileocolic intussusception. The underlying cause was a giant submucosal ulcerating lipoma (6?×?3.3?×?3.8 cm) extending from the superior mucosal lip of Bauhin’s valve. Abdominal ultrasonography showed a pathognomonic target-like mass appearing as multiple concentric rings. CT scan confirmed the diagnosis. Because of apparent obstruction, a laparotomy with right hemicolectomy and ileocolic anastomosis was performed. Lipomas most frequently occur in the cecum and ascending colon where they represent the most common submucosal mesenchymal tumor. They typically occur in elderly women with an incidence that varies from 0.15 to 0.56 %. Pain, rectal bleeding, and obstruction are typical symptoms. When faced with an intussusception in children, reduction with air per rectum can be performed. In adults, however, malignant cell spreading and seeding is of big concern. Since approximately 20–50 % of all underlying causes are malignant, explorative surgery is favored in adults.  相似文献   
83.
84.
85.
86.
87.
IntroductionInterprofessional learning (IPL) is a vital aspect of training in radiation oncology professions, yet is rarely delivered to those professionals who work most closely together in clinical practice. Scenario-based learning using simulation facilities provides a unique opportunity to facilitate this learning and this project aimed to determine the impact and value of this initiative.MethodsSmall groups comprising post-graduate diploma pre-registration therapeutic radiographers, medical physics trainees and radiation oncology registrars were challenged with 4 plausible and challenging radiotherapy scenarios within an academic simulation centre. Pre- and post-event completion of the “Readiness for Interprofessional Learning Scale” measured impact and a Likert-style survey gathered feedback from participants.ResultsThe session increased participants' teamwork and collaboration skills as well as strengthening professional identities. Participants reported high levels of enjoyment related to collaborative working, communication and observing other professionals deploying their technical skills and specialist knowledge.ConclusionAlthough beneficial, simulated scenarios offering equal opportunities for engagement across the professions are challenging to plan and timetabling issues between the 3 groups present significant difficulties. The safe environment and unique opportunity for these groups to learn together was particularly well received and future oncology-specific simulated scenario sessions are planned with larger cohorts.Implications for practiceSimulated scenario training can be used to improve team working across the radiotherapy interprofessional team and may have wider use in other specialist interdisciplinary team development.  相似文献   
88.
A local pedicled vascularized bone flap can prevent the morbidity and cost of free bone flap surgery in small segmental bone defects or long cartilaginous defects of the head and neck. Such flaps can also be useful in patients who are high risk for surgery. The periosteal vascularity of the mandible can be used to design islanded facial artery-based bone flaps, which can be utilized to that extent. Two patients with a small segmental mandibulectomy defect and one patient with a long cricotracheal resection defect underwent reconstruction using three different designs of islanded facial artery osteomyomucosal/osseous flap (iFOMM). The patients had a minimum follow-up period of 18 months. All flaps were successful, with satisfactory healing and without any functional deficit or disease at last follow-up.  相似文献   
89.
90.
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