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   1005628篇
  免费   69538篇
  国内免费   2588篇
耳鼻咽喉   13023篇
儿科学   34485篇
妇产科学   28465篇
基础医学   145490篇
口腔科学   27749篇
临床医学   90501篇
内科学   194088篇
皮肤病学   23147篇
神经病学   79440篇
特种医学   38439篇
外国民族医学   305篇
外科学   149718篇
综合类   23747篇
一般理论   385篇
预防医学   77924篇
眼科学   22653篇
药学   72025篇
  19篇
中国医学   2037篇
肿瘤学   54114篇
  2018年   10598篇
  2017年   8281篇
  2016年   9431篇
  2015年   10615篇
  2014年   14437篇
  2013年   22025篇
  2012年   29007篇
  2011年   30848篇
  2010年   18496篇
  2009年   17448篇
  2008年   28809篇
  2007年   30486篇
  2006年   30985篇
  2005年   29662篇
  2004年   28937篇
  2003年   27821篇
  2002年   26840篇
  2001年   46949篇
  2000年   48048篇
  1999年   40278篇
  1998年   11187篇
  1997年   10108篇
  1996年   10169篇
  1995年   9777篇
  1994年   9097篇
  1993年   8492篇
  1992年   32259篇
  1991年   31467篇
  1990年   31033篇
  1989年   29906篇
  1988年   27192篇
  1987年   27339篇
  1986年   25454篇
  1985年   24625篇
  1984年   18417篇
  1983年   15537篇
  1982年   9294篇
  1981年   8386篇
  1979年   16880篇
  1978年   12230篇
  1977年   10336篇
  1976年   9761篇
  1975年   10187篇
  1974年   12332篇
  1973年   11859篇
  1972年   10900篇
  1971年   10133篇
  1970年   9386篇
  1969年   8743篇
  1968年   8119篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
71.
Facial reanimation after acoustic neuroma excision is currently accomplished using a variety of surgical techniques. A multi-institutional survey of patient perceptions of facial reanimation success was accomplished by mailing a questionnaire to 809 randomly selected members of the Acoustic Neuroma Association. Four hundred sixty patients who underwent 296 reanimation procedures responded. Facial to hypoglossal nerve anastomosis, tarsorrhaphy, and upper eyelid implants were most frequently performed. The patient's estimations of initial deficit, spontaneous recovery, and overall satisfaction with the reanimation procedures are discussed.  相似文献   
72.
73.
74.
The epidemiologic correlation of chronic dietary salt intake among populations with the prevalence of hypertension has resulted in the concept that sodium plays an etiologic role in the development of essential hypertension (EH). However, the association of sodium intake with blood pressure in individuals within populations has been difficult to demonstrate. The differing human responses to sodium intake are dependent upon the individual level of sodium sensitivity or sodium resistance. Factors associated with sodium sensitivity are race, age, and other dietary factors. More recent investigations have pursued the interaction of sodium intake with other physiologic parameters including neurogenic activity, vascular structure, renal function, and other cations such as potassium and calcium. The observations that some humans demonstrate very little increase in blood pressure despite high levels of sodium intake supports the concept that a high sodium intake alone is not a single causal factor in hypertension. Sodium intake appears to interact with renal excretory capacity and vascular compliance. These varying physiologic functions must be delineated to characterize sodium sensitivity.  相似文献   
75.
In transmitting the body's weight, the ankle is subject to frequent static and dynamic injury due to concentrated stresses during standing and movement. The frequency of athletic ankle injuries ranges from 10 to 90 percent, with the highest rate occurring in basketball players. There is prolonged disability and recurrent instability for months to years for 25 to 40 per cent of these patients. Because most of this trauma is handled by primary care physicians, this review presents the mechanism of injury, relevant anatomy, physical examination, and appropriate therapeutic intervention in the acute and rehabilitative phases.  相似文献   
76.
Recurrent erosion   总被引:1,自引:0,他引:1  
  相似文献   
77.
Chorioretinal folds have been reported as a result of many intraocular and extraocular inflammatory processes or tumors. Visual loss is usually secondary to a combination of the underlying process and chorioretinal folds involving the macula. We report a patient who developed decreased vision, metamorphopsia, chorioretinal folds, and a lamellar macular hole secondary to global compression by a bone fragment. The chorioretinal folds regressed and his vision stabilized following surgical decompression. Chorioretinal folds and lamellar macular hold formation are previously unrecognized complications of reconstructive craniofacial surgery.  相似文献   
78.
79.
Eighty-nine cases of chronic bronchitis were matched against167 asymptomatic controls from the glass bangle industry ofFirozabad. Factors of age, social status, smoking habit andduration of exposure were studied. Duration of exposure wasfound to be a factor contributing significantly to the causationof disease. Requests for reprints should be addressed to: Dr B. N. Gupta, Division of Epidemilogy, Industrial Toxicology Research Centre, Mahatma Gandhi Marg, Lucknow P.O. Box 80, 226001, India  相似文献   
80.
The composition of the clientele from an ophthalmological practitioner's office is described with special reference to the occurrence of glaucoma and disc haemorrhages (h in singular; hh in plural). This study could not be planned as an epidemiological survey and gives no clue to sensitivity or specificity of hh in glaucoma. During a period of about 10 years ending with 1986 there were 731 patients with h and/or glaucoma. When detected, 185 patients had h but no glaucoma, 33 had both h and glaucoma and 513 had glaucoma but no h. During the follow-up period hh were detected in 83 cases of glaucoma, and glaucoma developed in 27 cases with hh. The detection rate of hh among glaucoma was low but steady, indicating that hh may occur at any stage of the glaucoma process. This study shows no predilection for hh in cases with general hypertension or diabetes, nor is the frequency of hh among pseudoexfoliation cases significantly lower than among cases without this stigma.  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