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   1813012篇
  免费   166218篇
  国内免费   3956篇
耳鼻咽喉   25287篇
儿科学   58481篇
妇产科学   50907篇
基础医学   246182篇
口腔科学   54595篇
临床医学   177198篇
内科学   360748篇
皮肤病学   38707篇
神经病学   151823篇
特种医学   72497篇
外国民族医学   483篇
外科学   278570篇
综合类   41909篇
现状与发展   43篇
一般理论   726篇
预防医学   147387篇
眼科学   41085篇
药学   131180篇
  5篇
中国医学   3152篇
肿瘤学   102221篇
  2021年   14660篇
  2018年   23402篇
  2017年   20049篇
  2016年   21766篇
  2015年   24351篇
  2014年   33262篇
  2013年   47398篇
  2012年   53593篇
  2011年   56082篇
  2010年   36896篇
  2009年   37493篇
  2008年   53476篇
  2007年   55406篇
  2006年   56824篇
  2005年   54265篇
  2004年   52713篇
  2003年   50246篇
  2002年   49162篇
  2001年   78809篇
  2000年   80737篇
  1999年   69433篇
  1998年   21038篇
  1997年   19143篇
  1996年   19159篇
  1995年   18555篇
  1994年   16999篇
  1993年   15951篇
  1992年   57137篇
  1991年   55449篇
  1990年   53999篇
  1989年   52219篇
  1988年   48495篇
  1987年   47744篇
  1986年   45495篇
  1985年   44122篇
  1984年   33268篇
  1983年   28709篇
  1982年   17432篇
  1981年   15688篇
  1979年   31279篇
  1978年   21853篇
  1977年   18509篇
  1976年   17345篇
  1975年   18167篇
  1974年   22119篇
  1973年   21258篇
  1972年   19321篇
  1971年   18188篇
  1970年   16692篇
  1969年   15599篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
BRING ADDICTION TREATMENT OUT OF THE CLOSET   总被引:1,自引:1,他引:0  
  相似文献   
992.
The co-existence of fungal elements in allergic nasal Polyposis, has given rise to a distinct clinical entity known as ‘Allergic fungal sinusitis ’ (AF’S). Many a time, these fungal elements may not be diagnosed pre-operatively by routine diagnostic nasal endoscopy or CT scan of paranasal sinuses, due to the florid presentation of nasal polyps, which usually obscure the underlying fungal pathology. The diagnosis is often made intra-operatively. The post-operative confirmation of AFS is by histopathology, fungal smear, fungal culture, allergic murin study and fungal specific IgE titres. We report a series often such cases done in our institution, which highlight that AFS should be considered as a differential diagnosis in Sinonasal Polyposis cases, for their effective management.  相似文献   
993.
Hepatic encephalopathy is a reversible state of altered cognition that may occur in patients with acute or chronic liver disease or porto-systemic shunt, and in which known neurological or psychiatric signs may develop. Nitrogenated substances from intestinal digestion reach the brain without being cleared by their passage through the liver due to the presence of porto-systemic shunt. We report two cases of patients with porto-systemic shunt diagnosed with recurrent chronic hepatic encephalopathy refractory to conventional medical treatment. They were satisfactorily treated with shunt embolization using interventionist radiology techniques.  相似文献   
994.
BACKGROUND CONTEXT: The effectiveness of spinal surgery as a treatment option is currently evaluated through the assessment of patient-reported outcomes (PROs). The minimum clinically important difference (MCID) represents the smallest improvement considered worthwhile by a patient. The concept of an MCID is offered as the new standard for determining effectiveness of a given treatment and describing patient satisfaction in reference to that treatment. PURPOSE: Our goal is to review the various definitions of MCID and the methods available to determine MCID. STUDY DESIGN: The primary means of determining the MCID for a specific treatment are divided into anchor-based and distribution-based methods. Each method is further subdivided and examined in detail. METHODS: The overall limitations of the MCID concept are first identified. The basic assumptions, statistical biases, and shortcomings of each method are examined in detail. RESULTS: Each method of determining the MCID has specific shortcomings. Three general limitations in the accurate determination of an MCID have been identified: the multiplicity of MCID determinations, the loss of the patient's perspective, and the relationship between pretreatment baseline and posttreatment change scores. CONCLUSIONS: An ideal means of determining the MCID for a given intervention is yet to be determined. It is possible to develop a useful method provided that the assumptions and methodology are initially declared. Our efforts toward the establishment of a MCID will rely on the establishment of specific external criteria based on the symptoms of the patient and treatment intervention being evaluated.  相似文献   
995.
Exercise advice is a well established component of the conservative management of intermittent claudication. Supervised programmes of exercise remain relatively uncommon and are provided mainly in secondary care. This review outlines the evidence for the effectiveness of different exercise regimens and the relative benefits of exercise therapy, where comparisons have been made with medical therapy, angioplasty and surgery.  相似文献   
996.
997.
998.
999.
Intramedullary implants have decisive advantages in the treatment of femoral fractures in the vicinity of the hip joint: a torque that leads to a less pronounced varus position, implantation in the course of the relevant forces, and primary stability in the case of both stable and unstable fractures. Because of the constant developments in the implants available and the frequent failure to differentiate between stable and unstable fractures, some of the recommendations in the literature seem to contradict each other. However, precise analysis of the literature data show that stable fractures can be adequately treated with any technique, while unstable fractures fall in the domain of nailing systems. Since it is not possible to distinguish unequivocally between stable and unstable fractures, all trochanteric and subtrochanteric femoral fractures should be treated with a cephalomedullary nailing system.  相似文献   
1000.
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