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   140735篇
  免费   1072篇
  国内免费   70篇
耳鼻咽喉   4493篇
儿科学   4711篇
妇产科学   5897篇
基础医学   25643篇
口腔科学   3425篇
临床医学   6362篇
内科学   28801篇
皮肤病学   6367篇
神经病学   9791篇
特种医学   5928篇
外科学   22448篇
综合类   471篇
一般理论   4篇
预防医学   4795篇
眼科学   5563篇
药学   4758篇
中国医学   48篇
肿瘤学   2372篇
  2015年   3340篇
  2014年   3968篇
  2013年   5225篇
  2012年   3848篇
  2011年   3635篇
  2010年   3963篇
  2009年   4026篇
  2008年   3903篇
  2007年   3793篇
  2006年   4256篇
  2005年   3726篇
  2004年   3409篇
  2003年   1815篇
  1999年   935篇
  1998年   1197篇
  1997年   1220篇
  1996年   1614篇
  1995年   1778篇
  1994年   1820篇
  1993年   1708篇
  1992年   1808篇
  1991年   1562篇
  1990年   1408篇
  1989年   1265篇
  1988年   1149篇
  1987年   1217篇
  1986年   1160篇
  1985年   983篇
  1984年   1089篇
  1983年   892篇
  1982年   1107篇
  1981年   1010篇
  1980年   976篇
  1979年   1013篇
  1978年   1154篇
  1977年   895篇
  1973年   917篇
  1936年   887篇
  1933年   1496篇
  1932年   1485篇
  1931年   1473篇
  1930年   1656篇
  1929年   1393篇
  1928年   1534篇
  1927年   1498篇
  1926年   1587篇
  1925年   1546篇
  1924年   1614篇
  1923年   1468篇
  1922年   1445篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
101.
Initially, data are presented which describe the difficulties which young women have in obtaining economic independence and earning their own living. Next, the vocational orientation of young women will be described. We hope to make clear that young women are more oriented towards grounding a family, in addition to making a career, than young men. The difficulties of having both children and a career will be discussed. Until now, an egalitarian responsibility of mother and father has not been reached. Mothers have the main responsibility in almost all cases. Finally, the article will list some urgent measures required to give women equal opportunities in work and to ease a young couple’s decision to have children.  相似文献   
102.
103.
Presented in this work is a rare injury of a blunt abdominal trauma in a child. Besides a partial rupture of the kidney and a retro-/intraperitoneal haematoma, a further injury occurred from the accident: an initially clinically indetectable tear of the A. iliaca communis which was found intraoperatively and with systematic CT analysis. Traumatic blood vessel lesions of the abdominal aorta and in particular the iliac blood vessels are very rare in children. By such violent impact injuries, it is therefore vital to perform a clinical examination of the foot pulse, systematic analysis of radiology diagnostics, and intraoperative exploration. The growth phase should be considered for therapy of the blood vessels depending on the child's age group. As the long-term results of graft implants are practically unknown, if possible a primary suture or vein patch should be performed.  相似文献   
104.
Benign strictures of the biliary ducts are treated surgically in 90% of cases. Usually they are caused by trauma to the choledochous duct during gallbladder operations. Younger patients are frequently affected and, particularly if the strictures go untreated, can suffer from secondary complications such as cholangitis or secondary biliary cirrhosis with the serious dangers of portal hypertension and even hepatic failure and death. Although immediate treatment by end-to-end anastomosis has sometimes been described, this method is reasonable only for smooth cuts to the choledochous duct. Good long-term results have been achieved in 86% of cases with Roux-en-Y hepaticojejunostomy. In general, the best way to avoid complications is the all-important surgical maxim of correct indication for the primary operation. The best course is to limit the decision for surgery to symptomatic gallstones.  相似文献   
105.
106.
Muscular atrophy is a symptom characterized by the loss of normal muscle mass. It is caused by a decline in the total number of muscle cells, or by a substantial decline in the substance of individual muscle cells. It has been associated with a preceding muscle weakness. Muscular atrophy occurs late in the course of a disease. Due to the limited ability of muscle cells to regenerate, it is frequently irreversible. Hence the aim is to detect the early stages of muscular decline and to prevent outright muscular atrophy. To achieve this it is necessary to be aware of the large number of diseases that can induce this in order to ensure timely referral to a specialist.  相似文献   
107.
By oxygen concentration measurements (Oximeter Oxydig Dräger, Lübeck) in the EC 145 helicopter two oxygen transport and application systems were compared. The new liquid oxygen system (LOX) for the oxygen therapy was assessed in an application observation. For physical reasons fluid oxygen evaporates during the stand-by phase and an increased concentration (22.8% O2) in the exhaust valve of LOX arises. On the other hand a high oxygen concentration (22.7% O2) was measured in the operation mode of the conventional pressure flask gas system (GAS). No increased concentration could be measured within the helicopter cabin (HEMS, PAX) comparing both oxygen systems. For transport and application of oxygen with a very big reserve for the air dependent intensive transport the results show that LOX is a sure low pressure system (3.4 bar).  相似文献   
108.
Endotracheal intubation is required in 5–10% of all prehospital emergencies. Poor environmental conditions (e.g. limited space, poor or excessive lighting etc.), unfavorable patient-related factors (e.g. trauma, bleeding, pulmonary aspiration etc.) and the pressure of time make prehospital airway management a challenging procedure even for experienced emergency physicians. The incidence of difficult endotracheal intubation is significantly higher than in-hospital. Profound clinical practice, recognition and adequate treatment of complications of intubation, and ongoing clinical practice are essential for successful and responsible prehospital airway management. A brief physical examination helps to identify predictors for difficult intubation, thereby modifying treatment strategies. Every emergency physician must be closely familiar with at least one supraglottic airway device and the recent algorithms to manage the unanticipated difficult airway.  相似文献   
109.
Isolated fractures of the metacarpal and phalangeal bones are common injuries of the upper extremities. They usually occur at the age of 10–40, whereas the highest incidence is observed in childhood. The results of treatment have an important impact for the practical value of the hand. This article aims to give a brief overview of the different fracture types and their treatment options.  相似文献   
110.
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