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   1078053篇
  免费   71881篇
  国内免费   1389篇
耳鼻咽喉   15065篇
儿科学   34726篇
妇产科学   28682篇
基础医学   153858篇
口腔科学   29642篇
临床医学   95105篇
内科学   204620篇
皮肤病学   24420篇
神经病学   81644篇
特种医学   43036篇
外国民族医学   201篇
外科学   163611篇
综合类   21713篇
现状与发展   1篇
一般理论   263篇
预防医学   74684篇
眼科学   24598篇
药学   86269篇
  7篇
中国医学   2814篇
肿瘤学   66364篇
  2019年   7793篇
  2018年   11353篇
  2017年   8966篇
  2016年   10160篇
  2015年   11327篇
  2014年   15352篇
  2013年   22313篇
  2012年   30710篇
  2011年   32473篇
  2010年   19046篇
  2009年   17895篇
  2008年   30113篇
  2007年   32251篇
  2006年   32864篇
  2005年   31235篇
  2004年   29935篇
  2003年   28748篇
  2002年   27704篇
  2001年   60086篇
  2000年   61570篇
  1999年   50997篇
  1998年   12486篇
  1997年   11034篇
  1996年   11047篇
  1995年   10352篇
  1994年   9361篇
  1993年   8880篇
  1992年   37854篇
  1991年   36325篇
  1990年   35794篇
  1989年   34352篇
  1988年   30904篇
  1987年   30030篇
  1986年   28252篇
  1985年   26493篇
  1984年   19200篇
  1983年   16133篇
  1982年   8828篇
  1979年   17048篇
  1978年   11414篇
  1977年   10239篇
  1976年   8840篇
  1975年   10071篇
  1974年   11656篇
  1973年   11282篇
  1972年   10762篇
  1971年   10098篇
  1970年   9258篇
  1969年   8944篇
  1968年   7925篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
Fifteen cases of microtuboplasty were done as outpatient procedures at low cost and with increased patient convenience. Advances in outpatient surgery at free-standing surgery centers have allowed many new patient care innovations, and microsurgery should now be considered an outpatient procedure for gynecologic patients. Outpatient microtuboplastic surgery is not only feasible but perhaps preferable to that done as an inpatient procedure.  相似文献   
82.
83.
84.
85.
86.
Eight-eight female weanling Sprague-Dawley rats were fed diets containing either 650 or 150 mg magnesium/kg diet and 7.0 or 3.5 mg pyridoxine-HCl/kg diet, in a 2 x 2 factorial arrangement, during growth, gestation, and lactation. The objective of the study was to determine whether concurrent dietary deficiencies of magnesium and pyridoxine were synergistic, additive, or antagonistic with regards to effects on reproductive performance, growth, and development of offspring, and tissue content of magnesium and calcium. Body weight of dams and pups was not different between groups until day 9 of lactation, at which point those animals in either low magnesium group weighed less than the other. Litter size and birth weight were not different. Development, as measured by timing of unfolding of the external ear, opening of both eyes, and clinical emergence of incisors, was delayed in pups from litters in the low magnesium groups. A synergistic effect on delay of onset of ear unfolding by deficiency of both magnesium and pyridoxine was observed. Calcium content of heart and kidney from dams was increased in the low magnesium groups. Renal calcium was not further increased by the level of pyridoxine deficiency in this study. The calcium to magnesium ratio in heart from pups was higher in those from litters in the low magnesium and pyridoxine group than in the others. Results indicate that simultaneous deficiencies of magnesium and pyridoxine may impair function synergistically. Because these two nutrients are often reported to be presented in inadequate amounts in diets of women in their reproductive years, the potential exists for impaired reproductive success.  相似文献   
87.
88.
A rotating contact lens holder for the three-mirror Goldmann lens permits circular examination of the fundus or chamber angle without having to change the position of the fingers on the edge of the lens. The contact lens holder consists of an outer polygonal ring hold by the thumber and index finger. An inner rotating ring holds the contact lens. Continuous rotation of the contact lens is performed with the free middle Finger. This device permits circular examination of the retina without interruption of fixation. The instrument improves not only the speed but also the reliability of the examination.  相似文献   
89.
Herpes zoster probably occurs more often than generally thought. Since it produces a radicular distribution of pain, it should be included in the differential diagnosis of radiculopathy. A case is presented in which evaluating the radicular low back pain before the characteristic rash appears was misleading. Careful history-taking concerning the exact nature of the pain and sensory changes is needed to differentiate between zoster and radiculopathy, if no rash is evident.  相似文献   
90.
Vaccine cuisine.   总被引:1,自引:0,他引:1       下载免费PDF全文
  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