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   252094篇
  免费   17860篇
  国内免费   1130篇
耳鼻咽喉   2787篇
儿科学   6496篇
妇产科学   4598篇
基础医学   32956篇
口腔科学   4557篇
临床医学   25335篇
内科学   53619篇
皮肤病学   3390篇
神经病学   24290篇
特种医学   8398篇
外国民族医学   11篇
外科学   38468篇
综合类   3457篇
一般理论   318篇
预防医学   21401篇
眼科学   6559篇
药学   16986篇
  6篇
中国医学   361篇
肿瘤学   17091篇
  2023年   1339篇
  2022年   2414篇
  2021年   5442篇
  2020年   3262篇
  2019年   5300篇
  2018年   5950篇
  2017年   4470篇
  2016年   4960篇
  2015年   5830篇
  2014年   8603篇
  2013年   11796篇
  2012年   18010篇
  2011年   18902篇
  2010年   10579篇
  2009年   9427篇
  2008年   16600篇
  2007年   17452篇
  2006年   17302篇
  2005年   17279篇
  2004年   16196篇
  2003年   15043篇
  2002年   14060篇
  2001年   2109篇
  2000年   1604篇
  1999年   2316篇
  1998年   3067篇
  1997年   2563篇
  1996年   2184篇
  1995年   2097篇
  1994年   1745篇
  1993年   1573篇
  1992年   1257篇
  1991年   1152篇
  1990年   1002篇
  1989年   979篇
  1988年   970篇
  1987年   947篇
  1986年   950篇
  1985年   967篇
  1984年   1217篇
  1983年   1123篇
  1982年   1364篇
  1981年   1312篇
  1980年   1145篇
  1979年   703篇
  1978年   747篇
  1977年   635篇
  1976年   584篇
  1975年   469篇
  1974年   473篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
92.
93.
Acute myelogenous leukemia (AMU is a hematologic disorder that is characterized by an abnormal proliferation of immature myeloid cells. Granulocytic sarcomas are clusters of leukemic myeloid cells that may develop as a result of AML. Oral manifestations of AML are common and often involve enlargements of the gingiva and/or mucosal tissue from direct leukemia cell infiltration. We describe the case history of a 50-year-old man who had an ulcera-tive lesion of the oral mucosa that was determined to be a granulocytic sarcoma of AML-M0 subtype. The combination of both the subtype and clinical presentation of the leukemia makes this presentation unusual, and to the best of our knowledge, of a type that has not been previously reported in the literature.  相似文献   
94.

Background  

Skin and soft tissue infections are increasingly prevalent clinical problems, and it is important for health care practitioners to be well trained in how to treat skin abscesses. A realistic model of abscess incision and drainage will allow trainees to learn and practice this basic physician procedure.  相似文献   
95.
96.
Infections caused by extended-spectrum beta-lactamase (ESBL)-producing pathogens, particularly Klebsiella pneumoniae, are increasing. The epidemiology of ESBL-producing K. pneumoniae, the mechanisms of resistance, and treatment strategies for infections caused by these organisms are reviewed.  相似文献   
97.
Accurate images of the craniofacial region are critical for the development of an orthodontic diagnosis and treatment plan. The NewTom QR 9000 Volume Scanner (QR s.r.l., Verona, Italy) represents a significant advance in imaging capabilities for dentistry and orthodontics. This new-generation scanner uses computed tomography technology to provide a complete 3D view of the maxilla and mandible with relatively high resolution and low radiation exposure to patients. This article discusses some technical aspects of this new scanner and its possible orthodontic uses.  相似文献   
98.
This study aimed to determine whether a weight-adjusted dose of subcutaneous enoxaparin is as effective and safe as oral acenocoumarol for the secondary prophylaxis of pulmonary embolism. Three hundred and eighty consecutive noncancer outpatients hospitalized with an episode of symptomatic pulmonary embolism selected treatment with acenocoumarol or enoxaparin at a dose of 1 mg/kg once daily after being informed of the type of administration and expected frequency of laboratory monitoring for both medicinal products. Endpoints were symptomatic recurrent thromboembolic events evaluated by standard objective testing, and a composite endpoint of recurrent venous thromboembolism, major bleeding, and death from any cause. One hundred and ninety-nine patients (52%) chose acenocoumarol therapy and 181 chose enoxaparin monotherapy. Four patients in the enoxaparin group (2.2%) and six patients in the acenocoumarol group (3%) had an objective thromboembolic recurrence (hazard ratio, 1.35; 95% confidence interval, 0.38-4.79; P = 0.64). Nine patients in the enoxaparin group (5.0%) had a hemorrhagic complication compared with 11 in the acenocoumarol group (5.5%) (P = 0.81). The hospital length of stay was shorter with enoxaparin compared with acenocoumarol (11 versus 16 days, P = 0.0001). Enoxaparin is as effective and safe as acenocoumarol in the secondary prevention of recurrent thromboembolic disease and is associated with shorter hospitalization.  相似文献   
99.
100.
Prezant  David J. 《Lung》2007,186(1):94-102

To date, the main respiratory health consequence from the collapse of the World Trade Center (WTC) on September 11, 2001 has been the “WTC Cough Syndrome” (chronic rhinosinusitis, asthma, and/or bronchitis, often complicated by gastroesophageal reflux dysfunction). Syndrome incidence and severity have been linked to WTC dust exposure intensity. While it is too early to ascertain long-term effects of WTC dust exposure, effective treatment guidelines have been designed through a collaborative effort by the three established centers of excellence for WTC medical monitoring and treatment and the WTC Registry. These treatment recommendations are described here.

  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