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   1697182篇
  免费   123852篇
  国内免费   3786篇
耳鼻咽喉   21747篇
儿科学   55685篇
妇产科学   46196篇
基础医学   241481篇
口腔科学   48768篇
临床医学   151522篇
内科学   334000篇
皮肤病学   38660篇
神经病学   131288篇
特种医学   63927篇
外国民族医学   242篇
外科学   257417篇
综合类   38981篇
现状与发展   4篇
一般理论   532篇
预防医学   124558篇
眼科学   40245篇
药学   123740篇
  7篇
中国医学   4476篇
肿瘤学   101344篇
  2021年   12811篇
  2019年   13545篇
  2018年   19978篇
  2017年   15241篇
  2016年   16638篇
  2015年   18989篇
  2014年   26266篇
  2013年   38006篇
  2012年   52811篇
  2011年   55507篇
  2010年   32824篇
  2009年   30746篇
  2008年   51613篇
  2007年   54889篇
  2006年   55343篇
  2005年   52618篇
  2004年   50811篇
  2003年   48227篇
  2002年   46449篇
  2001年   91854篇
  2000年   93675篇
  1999年   77019篇
  1998年   19735篇
  1997年   17286篇
  1996年   17410篇
  1995年   16758篇
  1994年   15310篇
  1993年   14088篇
  1992年   57430篇
  1991年   55316篇
  1990年   53016篇
  1989年   50790篇
  1988年   46179篇
  1987年   44970篇
  1986年   42255篇
  1985年   40027篇
  1984年   29381篇
  1983年   24931篇
  1982年   13909篇
  1979年   25553篇
  1978年   17593篇
  1977年   14920篇
  1976年   13890篇
  1975年   14574篇
  1974年   17649篇
  1973年   16953篇
  1972年   15684篇
  1971年   14456篇
  1970年   13440篇
  1969年   12523篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
The Executive Nurse Council was challenged to develop strategies designed to empower staff nurses and nurse managers and create opportunities for professional growth. Implementation of these strategies resulted in broad-sweeping changes in roles and functions of groups and individuals at all levels of the organization. The authors describe a support role, administrative nurse specialist, designed to support staff and managers striving to actualize changes in a shared governance framework.  相似文献   
992.
Coexistent primary hyperparathyroidism and monoclonal gammopathy, although rare, has been reported previously by a number of investigators. We report four patients with such an occurrence who were seen between 1976 and 1988. Another patient with primary hyperparathyroidism also had multiple myeloma and was in remission for 12 years. These patients represent approximately 1% of the 386 patients with primary hyperparathyroidism seen during the same 12-year period. Although several mechanisms have been proposed to explain this concurrence, we believe it is the result of a chance occurrence. A review of the literature, an estimate of the chance occurrence of coincidental monoclonal gammopathy, benign or malignant, in patients with primary hyperparathyroidism, and some practical implications of this interesting coexistence are presented.  相似文献   
993.
Data obtained on a sample of persons with mild to profound degrees of mental retardation (N = 8255) and ranging from birth to 98 years of age were factor analyzed to provide information on the structure of maladaptive behavior relative to age and degree of mental retardation. Using the Problem Behavior scales of the Inventory for Client and Agency Planning, two principal factors emerged for children with mild to profound degrees of retardation: Internalized Maladaptive and Externalized Maladaptive. For adolescents and young adults, a three-factor solution which varied by degree of retardation was most appropriate. For middle and older adults, three- and four-factor solutions were identified across all ages and degrees of retardation. Across all samples as many as six different types of dimensions were identified, indicating that the structure of maladaptive behavior may well be influenced by age and level of mental retardation.  相似文献   
994.
995.
A rare case of a maxillo-mandibular band in a 21 year female patient is reported. Possibility of its being a remnant of buccaphary geal membrane is discussed in the light of clinical and histological findings.  相似文献   
996.
997.
Clinical and laboratory indications of hemocoagulatory disorders (according to the data of electrocoagulograph H-334 and red blood cell deformability) were compared for multiple myeloma patients. They received drugs according to 3 different polychemotherapy schemes involving various combinations and doses of cyclophosphamide, vincristine, rubomycin, paphencyl, sarcolysin and prednisolone. Pretreatment measurements in relevant patients revealed severe hemocoagulative and rheologic shifts responsible for hemorrhages, impaired microcirculation and cardiac failure. The most efficient polychemotherapy was found that gained benefit with addition of plasmapheresis. To control the effect of polychemotherapy, its intensity, individual deviations and duration, it is advisable to combine routine tests with citrated plasma electrocoagulography, assessment of AT-III activity and red blood cell deformability indicating hemocoagulative and rheologic disorders.  相似文献   
998.
999.
1000.
A simple gas chromatographic procedure has been developed for the determination of methyltestosterone in bulk powders and in tablets. Two new silyl ether derivatives of methyltestosterone have been prepared using dimethylethylsilylimidazole (DMESI) and dimethylisopropylsilylimidazole (DMiPSI). The method is accurate and selective for methyltestosterone within the concentration range 0.1-1.5 micrograms microliters-1.  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