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   363篇
  免费   7篇
  国内免费   23篇
电工技术   6篇
综合类   2篇
化学工业   31篇
金属工艺   25篇
机械仪表   5篇
建筑科学   2篇
矿业工程   5篇
能源动力   1篇
轻工业   19篇
石油天然气   14篇
武器工业   4篇
无线电   15篇
一般工业技术   29篇
冶金工业   177篇
原子能技术   15篇
自动化技术   43篇
  2021年   2篇
  2018年   7篇
  2017年   3篇
  2016年   5篇
  2014年   6篇
  2013年   5篇
  2012年   7篇
  2011年   15篇
  2010年   7篇
  2009年   2篇
  2007年   3篇
  2006年   5篇
  2005年   4篇
  2004年   18篇
  2003年   10篇
  2002年   16篇
  2000年   2篇
  1999年   22篇
  1998年   34篇
  1997年   26篇
  1996年   25篇
  1995年   21篇
  1994年   46篇
  1993年   5篇
  1992年   4篇
  1991年   8篇
  1990年   5篇
  1989年   9篇
  1988年   4篇
  1987年   3篇
  1986年   7篇
  1984年   1篇
  1983年   1篇
  1982年   2篇
  1981年   2篇
  1980年   3篇
  1978年   1篇
  1977年   9篇
  1976年   13篇
  1975年   4篇
  1974年   2篇
  1972年   3篇
  1970年   1篇
  1969年   1篇
  1968年   2篇
  1960年   2篇
  1959年   2篇
  1958年   1篇
  1943年   1篇
  1882年   3篇
排序方式: 共有393条查询结果,搜索用时 15 毫秒
51.
52.
In this study we have determined the incidence of hepatocellular carcinoma (HCC) development in primary biliary cirrhosis (PBC) and its effects on patient survival. Six hundred and sixty seven patients with liver histology compatible with or diagnostic of PBC were seen over a 20-year period. Two hundred and seventy three patients who had stage III or IV disease on their last biopsy and who had been followed up for at least 1 year following that biopsy (total follow-up with advanced disease 2,010 patient years) were identified (243 female, 30 male). Patients who developed HCC were identified and their confounding risk factors were excluded. Mayo risk scores were calculated for each clinic attendance and expected survival for each time point was compared with subsequent actual survival. Sixteen cases of HCC were seen in the patients with stage III or IV disease on last biopsy, providing an overall incidence of 5.9% in this group. Fourteen of these patients had died of HCC related causes, and 2 patients were alive at the census point. The incidence of HCC was significantly higher in males with stage III/IV disease than in females (20% vs. 4.1%, P < .005). Nine of one hundred and eight (8.3%) total female deaths in this group was attributable to HCC compared with 5 of 11 (45.5%, P < .05) male deaths. HCC was not seen in any of the 394 patients with stage I and II PBC followed-up over the same time period. Throughout the disease course of all PBC patients with HCC, the Mayo prognostic model over-predicted survival. Whereas it is a relatively rare complication of cirrhotic PBC in women, HCC is a relatively common cause of death in male PBC patients with cirrhosis. HCC typically develops several years after the onset of cirrhosis, and is poorly predicted by prognostic models. In view of these findings, consideration should be given to careful screening for HCC in male PBC patients with cirrhosis. The risk of HCC development may be an additional reason to consider earlier transplantation in these patients.  相似文献   
53.
Insulin, glucagon and C-peptide content in the blood was assayed with the use of commercial radioimmune kits (Diagnostic, USA, and Oris, France). A total of 93 peptic ulcer patients (35 with duodenal peptic ulcer, 28 with gastric ulcer, 16 after Billroth-I resection, and 14 after Billroth-II resection) and 25 patients with chronic gastritis attended by secretory insufficiency were investigated. The study was conducted on empty stomach and after a test breakfast containing 57 g of protein, 63 g of fat, 103 g of carbohydrates that comprised 1212 kcal. The highest changes in hormone incretion were recorded in patients with peptic ulcer disease after Billroth-I and Billroth-II resection, the lowest--in patients with chronic gastritis attended by secretory insufficiency.  相似文献   
54.
55.
56.
57.
A programme of evaluation and selection of superior trees has led to the vegetative propagation of highly productive clones which produce tea tree oil high in terpinen-4-ol. These will soon provide commercial quantities of a particularly active oil of consistent quality for use in formulations for therapeutic use and in particular for vaginal thrush.  相似文献   
58.
59.
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