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   2374044篇
  免费   169138篇
  国内免费   5292篇
耳鼻咽喉   32110篇
儿科学   77996篇
妇产科学   65238篇
基础医学   336438篇
口腔科学   67798篇
临床医学   209004篇
内科学   467174篇
皮肤病学   53047篇
神经病学   185761篇
特种医学   91218篇
外国民族医学   562篇
外科学   363309篇
综合类   53835篇
现状与发展   4篇
一般理论   751篇
预防医学   175164篇
眼科学   56294篇
药学   172261篇
  48篇
中国医学   5673篇
肿瘤学   134789篇
  2019年   17998篇
  2018年   26089篇
  2017年   20027篇
  2016年   21861篇
  2015年   24947篇
  2014年   34990篇
  2013年   51889篇
  2012年   71187篇
  2011年   75253篇
  2010年   44965篇
  2009年   42265篇
  2008年   70634篇
  2007年   75180篇
  2006年   75737篇
  2005年   72922篇
  2004年   70246篇
  2003年   67220篇
  2002年   65265篇
  2001年   119050篇
  2000年   121982篇
  1999年   101606篇
  1998年   27133篇
  1997年   24043篇
  1996年   24085篇
  1995年   22930篇
  1994年   21269篇
  1993年   19713篇
  1992年   77625篇
  1991年   74769篇
  1990年   72259篇
  1989年   69530篇
  1988年   63743篇
  1987年   62322篇
  1986年   59115篇
  1985年   56057篇
  1984年   41554篇
  1983年   35297篇
  1982年   20315篇
  1979年   37190篇
  1978年   25793篇
  1977年   21916篇
  1976年   20444篇
  1975年   21942篇
  1974年   26485篇
  1973年   25481篇
  1972年   23768篇
  1971年   22026篇
  1970年   20709篇
  1969年   19406篇
  1968年   18215篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
941.
We report a case of pulmonary oedema follwing airway obstructionin a patient who underwent biopsy of a tumo ur in volving theanterior mediastinum and neck. The occurrence of airway obstructionin patients with anterior mediastinal masses, and the pathogenesisof pulmonary oedema occurring in association with airway obstruction,are discussed.  相似文献   
942.
Zusammenfassung In einem pulsatil mit Kochsalz durchströmten Modell der Femoralisgabel wurden Flussmessungen und Druckgradienten für Flussmengen von 170 bis 860 ml/min bei peripheren Widerständen von 232 bis 25 792 dyn s cm–5 über dem Superficialis- und Profundaabgang bei Stenosen von 1 cm Länge und Querschnittsverminderungen von 0% bis 100% gemessen. Bei grossen Flussmengen (800–860 ml/min) und kleinem peripheren Widerstand (<640 dyn s cm–5) lag die kritische Stenose am Profundaabgang bei 4,1 mm Durchmesser, für hohe periphere Widerstände (> 5 072 dyn s cm–5) bei 2,6 mm; bei kleinen Flussmengen (<400 ml/min) betrug der kritische Durchmesser 1,8 mm. Der nicht stenosierte Profundaabgang stellte für keine der Versuchsbedingungen ein strömungsdynamisches Hindernis dar.  相似文献   
943.
The second documented case of renal aspergilloma due to Aspergillusflavus is presented. The merits of the medical therapy thatfailed are discussed. Pathological examination showed a nidusof aspergillus around suture material persisting from a pyelolithotomyoperation 2 years before in India. We argue that this was thereason for the failure of the medical therapy. This is the firstcase of its kind reported.  相似文献   
944.
Traumatology of the alar ligaments   总被引:2,自引:0,他引:2  
A postmortem study of craniocerebral traumas of varying severity was done to determine the pattern of injury of the alar ligaments. It was found that in the entire group of patients (n = 30) the alar ligaments were ruptured or suffused with blood 11 times. No close relationship was found between the massive nature of the cranial trauma and the severity of the injury of the alar ligaments. In some cases the alar ligaments were not at all involved even though the skull had suffered extensive osseous lesions, whereas on the other hand the ligaments were injured even though only soft parts had been involved (e.g., haematoma or dehiscent wounds of the scalp). Ruptures of the alar ligaments were typically involved in extended ruptures of the ligamentous apparatus (see Figure 6a involving the ligamentum apicis dentis, ligamentum transversum atlantis, m.atlanto-occipitalis anterior, m.tectoria, m.atlanto-axialis anterior et posterior). In some cases the pattern of injury of the alar ligaments was found to be decisive in enabling reconstruction of the course of the accident. Damage to the alar ligaments near the dens axis represent rotation injuries. On the other hand, insertion tears out of the condyli occipitales must be related to a lateral thrust tendency in indirect fracture of the skull (bursting fracture). Within this overall framework a new mechanism of fracture of the condylus occipitalis is described. As a matter of principle, the alar ligaments can become involved in consequence of rotation, traction and compression of the cranium.  相似文献   
945.
946.
947.
Two hundred and thirty pregnancies were studied in 196 diabetic women. Seven women with babies found to have major malformations had a higher median first trimester haemoglobin A1 (12.9%) than the median HbA1 (10.8%) in those with normal babies (p = 0.06). No relationship was found between the occurrence of minor malformations and first trimester maternal haemoglobin A1. Two of the seven congenital malformations were diagnosed antenatally at a time when therapeutic abortion could be offered. Expert antenatal ultrasound scanning should be offered to all pregnant diabetic women as poor glycaemic control at the time of conception and organogenesis, as evidenced by raised first trimester HbA1, predisposes to congenital malformation.  相似文献   
948.
Self-mutilation and self-blame in incest victims   总被引:1,自引:0,他引:1  
A case is made for self-blame as the psychic link between children's experiences of incestuous sexual abuse and their self-mutilating behavior later in life. Representative case histories and the results of a small pilot study are presented to illustrate the author's theoretical formulation.  相似文献   
949.
950.
Various cases are presented demonstrating the role of computed tomography (CT) in the assessment of serosal and bowel wall pathology. Reference is made to the morphology of the lesions. Illustrative examples of tumors, secondary malignant dissemination, irradiation injury to the gut, and intramural gas associated with ulcerative colitis, are all illustrated.  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