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   1386182篇
  免费   124181篇
  国内免费   1544篇
  2021年   18277篇
  2019年   16512篇
  2018年   17976篇
  2017年   16669篇
  2016年   28570篇
  2015年   43271篇
  2014年   51460篇
  2013年   77830篇
  2012年   37847篇
  2011年   25869篇
  2010年   43827篇
  2009年   45331篇
  2008年   24302篇
  2007年   22311篇
  2006年   27789篇
  2005年   28535篇
  2004年   27846篇
  2003年   25374篇
  2002年   23724篇
  2001年   35983篇
  2000年   33594篇
  1999年   33087篇
  1998年   25740篇
  1997年   25497篇
  1996年   24975篇
  1995年   23176篇
  1994年   22950篇
  1993年   22030篇
  1992年   28356篇
  1991年   26421篇
  1990年   24996篇
  1989年   25779篇
  1988年   23759篇
  1987年   22480篇
  1986年   21597篇
  1985年   23444篇
  1984年   23057篇
  1983年   20263篇
  1982年   20871篇
  1981年   20088篇
  1980年   18704篇
  1979年   19238篇
  1978年   18215篇
  1977年   17420篇
  1976年   16575篇
  1975年   16235篇
  1974年   16937篇
  1973年   17279篇
  1972年   14765篇
  1971年   13517篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
931.
932.
The capillaries of the cardiac muscle were investigated in the goat by means of light microscopy, transmission electron microscopy and scanning electron microscopy, and the following results were obtained. The capillaries of the working cardiac muscles were numerous, arranged mainly parallel to the long axis of muscle cells and formed dense elongated networks. On the contrary, those of the terminal Purkinje fibers were relatively few in number, oriented in various directions and formed loose and circularly meshed networks surrounding the fibers. Such findings were discussed in correlation with the physiology and functional morphology of various types of the cardiac muscle cells.  相似文献   
933.
Correspondenz     
Ohne Zusammenfassung  相似文献   
934.
935.
Five cases of coincident salmonellosis and ulcerative colitis are described. In three the diagnostic combination was recognized late. If corticosteroid therapy is given for the colitis once the combination is recognized, then simultaneous systemic antibiotic cover is advisable. One of the five patients died during corticosteroid therapy alone with salmonella septicaemia due to a usually non-invasive organism.  相似文献   
936.
Seven patients with “coeliac axis compression syndrome” are reported. Five were treated surgically, but only two did well. A survey of 200 healthy adults showed epigastric bruits in 6·5%; only one of these had dyspepsia, though dyspepsia was present in 12·5% overall.Caution is urged in attributing a causal relationship between coeliac axis compression and pain and in proceeding to arteriography when compression is suspected on clinical grounds.  相似文献   
937.
From experience in the Northampton/Kettering area 9 to 10% of all patients in a general hospital requiring care in an intensive therapy unit were aged 12 years or under. Fifty-nine children were admitted to the intensive therapy unit of Northampton General Hospital between May 1967 and August 1969. Of these, 22 had been injured in road traffic accidents, five were surgical emergencies, five had meningitis, four status epilepticus, and four respiratory infections.All of the 30 families interviewed were in favour of their child being admitted to the unit, and none considered that the experience had had any lasting adverse psychological effect on the child. It is suggested that certain carefully selected child patients do benefit from the facilities of an intensive therapy unit, and for this reason such units must be designed, equipped, and staffed with this in mind.  相似文献   
938.
939.
940.
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