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   1354930篇
  免费   140520篇
  国内免费   820篇
  2018年   15459篇
  2017年   14648篇
  2016年   19104篇
  2015年   23132篇
  2014年   27059篇
  2013年   38910篇
  2012年   44558篇
  2011年   47870篇
  2010年   33240篇
  2009年   30856篇
  2008年   42318篇
  2007年   44466篇
  2006年   38327篇
  2005年   37302篇
  2004年   36978篇
  2003年   35677篇
  2002年   34782篇
  2001年   56803篇
  2000年   56729篇
  1999年   45626篇
  1998年   17159篇
  1997年   17496篇
  1996年   16569篇
  1995年   15351篇
  1994年   14973篇
  1993年   14903篇
  1992年   37868篇
  1991年   36916篇
  1990年   36138篇
  1989年   35376篇
  1988年   32813篇
  1987年   31125篇
  1986年   29040篇
  1985年   28931篇
  1984年   24130篇
  1983年   20720篇
  1982年   15801篇
  1981年   14331篇
  1980年   13360篇
  1979年   22313篇
  1978年   17614篇
  1977年   16007篇
  1976年   14846篇
  1975年   16565篇
  1974年   17698篇
  1973年   17642篇
  1972年   16363篇
  1971年   14760篇
  1970年   12592篇
  1969年   12222篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
121.
Over the past 10 years the AIDS crisis has produced a large volume of writing. Much of this is documentary. Dozens of studies of AIDS from various clinical and political perspectives have been complemented by just as many published diaries, autobiographies, novels, plays, and poems. A few of these works have risen to the surface not only as extraordinarily valuable testimonies to the changes AIDS has wrought in individual and collective life but also as first-rate literary works, worth reading because beyond their immediate purposes they articulate with extraordinary lucidity and compassion some deep truths about the human--and the modern--condition. Paul Monette's Borrowed Time is among the most distinctive of those. It speaks not only for the community of people with AIDS and those who support them but for a generation.  相似文献   
122.
123.
Argon laser surgery is an effective treatment for ectasias and congenital port-wine stains; however, its use in children under the age of 13 is controversial. This paper reviews 202 children under the age of 13 who underwent argon laser treatments for congenital port-wine stains, spider angiomas, epidermal nevi, and lentigines. The clinical characteristics of port-wine stains in 170 children are discussed. Good to excellent results (moderate to complete clearing) in port-wine stains were obtained in 60 percent of patients and seemed to correlate best with lack of blanchability on pressure. Hypertrophic scarring was seen in only 7 children, all of whom had undressed wounds; no significant scarring has been seen in any subsequent child who had maintained a dressed wound postoperatively.  相似文献   
124.
Reconstruction of bony structures of the face is always a problem as big as the defect and the function that must be replaced. Everything from simple grafts to sophisticated distant bone flaps has been used. Based on the studies of Cutting et al., Psillakis et al., and Casanova et al., we have developed the full-thickness galeoparietal bone flap, initially for mandibular reconstruction, but of great use for all maxillofacial reconstructions. From July of 1987 to December of 1988, 14 patients have been operated on. The experience with this flap is shown in four patients as follows: primary reconstruction of a mandible as a result of ameloblastoma, secondary reconstruction of a mandible with associated old fractures and malalignment of segments, bilateral malar reconstruction in a patient with Treacher Collins syndrome, and severe sequelae of an already treated Romberg case. Small variations could be made to best accommodate the technique used to the defect we were treating. Some technical details, the experience, the results, and possible sequelae or complications are also discussed.  相似文献   
125.
126.
127.
128.
129.
130.
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