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   390090篇
  免费   21148篇
  国内免费   15473篇
耳鼻咽喉   3008篇
儿科学   8713篇
妇产科学   5923篇
基础医学   42354篇
口腔科学   5204篇
临床医学   42878篇
内科学   62928篇
皮肤病学   2858篇
神经病学   28331篇
特种医学   17009篇
外国民族医学   138篇
外科学   49947篇
综合类   37320篇
现状与发展   55篇
一般理论   19篇
预防医学   30888篇
眼科学   9393篇
药学   31817篇
  194篇
中国医学   12883篇
肿瘤学   34851篇
  2024年   699篇
  2023年   3558篇
  2022年   9199篇
  2021年   11568篇
  2020年   8598篇
  2019年   7604篇
  2018年   29181篇
  2017年   23896篇
  2016年   25562篇
  2015年   11097篇
  2014年   13301篇
  2013年   11397篇
  2012年   22703篇
  2011年   38345篇
  2010年   28839篇
  2009年   19412篇
  2008年   30220篇
  2007年   32405篇
  2006年   11670篇
  2005年   13390篇
  2004年   10219篇
  2003年   10805篇
  2002年   7889篇
  2001年   5186篇
  2000年   5737篇
  1999年   5834篇
  1998年   3713篇
  1997年   3692篇
  1996年   2896篇
  1995年   2701篇
  1994年   2234篇
  1993年   1431篇
  1992年   1925篇
  1991年   1676篇
  1990年   1409篇
  1989年   1164篇
  1988年   1064篇
  1987年   927篇
  1986年   747篇
  1985年   553篇
  1984年   354篇
  1983年   261篇
  1982年   173篇
  1981年   145篇
  1980年   150篇
  1979年   144篇
  1975年   62篇
  1974年   75篇
  1938年   64篇
  1932年   57篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
31.
32.
Pneumocephalus is a very rare complication of video-assisted thoracoscopic surgery (VATS). A 66-year-old man developed pneumocephalus secondary to thoracoscopic excision of a neurogenic tumor in the posterior mediastinum. Pneumocephalus was diagnosed by brain computed tomography. Neurosurgical intervention was performed after conservative therapy had failed. The patient's condition had resolved without any neurologic sequelae 2 years later. When a patient has a relatively large amount of chest tube drainage and neurologic symptoms after VATS, the possibility of pneumocephalus due to cerebrospinal fluid leakage must be considered.  相似文献   
33.
34.
For persons battling HIV/AIDS a stable place to live may decide the length and quality of life itself. It is nearly impossible for a person on the streets to engage in a needed continuous AIDS treatment regimen when the very basic question of where that person will rest his or her head when darkness comes in just a few hours is unresolved. When danger lurks on the streets, when cold numbs the limbs, when tiredness overwhelms the mind, when fear breaks the spirit, a place to call home would make all the difference.  相似文献   
35.
Erratum     
  相似文献   
36.
The authors reviewed the radiographic manifestations of 17 cases of parosteal osteosarcoma, with pathologic correlation in 15. There were two types of parosteal osteosarcoma radiologically. The majority of cases were type I with uniformly dense masses which had regular borders. They often adhered to the cortex and showed no evidence of soft-tissue invasion which correlated with low-grade pathologic malignancy and a relatively benign clinical course. Type II involved the bone, soft-tissue and the medullary cavity. These lesions were poorly differentiated and frequently accompanied by metastatic lesions.
  相似文献   
37.
38.
39.

Background  

Health service policy in the United Kingdom emphasises the importance of self-care by patients with chronic conditions. Written information for patients about their condition is seen as an important aid to help patients look after themselves. From a discourse analysis perspective written texts such as patient information leaflets do not simply describe the reality of a medical condition and its management but by drawing on some sorts of knowledge and evidence rather than others help construct the reality of that condition. This study explored patient information leaflets on osteoarthritis (OA) to see how OA was constructed and to consider the implications for self-care.  相似文献   
40.
This study evaluated the safety and efficacy of batroxobin in treating hyperfibrinogenemia for secondary stroke prevention. Patients with ischemic stroke or transient ischemic attack (TIA) were measured for plasma fibrinogen levels. Selected participants had concomitant hyperfibrinogenemia (plasma fibrinogen > or = 3.0 g/l). Patients enrolled between 1 July 2003 and 31 December 2004 were treated with batroxobin; patients enrolled between 1 January 2002 and 30 June 2003 were treated without batroxobin. Batroxobin was administered intermittently via intravenous injection at 3-monthly intervals. Patients in both groups were followed for 1 year. Any cerebrovascular events and suspected adverse events were recorded. In total, 112 ischemic stroke/TIA patients with concomitant hyperfibrinogenemia were enrolled, 52 being treated with batroxobin and 60 without batroxobin. Six patients (11.5%) with batroxobin and 16 patients (26.7%) without batroxobin had recurrent cerebral ischemic events during follow-up. Stroke/TIA recurrence in patients without batroxobin was higher than that in patients with batroxobin (P < 0.05). Two patients with batroxobin and two patients without batroxobin developed hemorrhagic stroke during follow-up. There were five deaths (9.6%) in the batroxobin group, and seven deaths (11.7%) in the nonbatroxobin group during follow-up (P > 0.05). Intermittent intravenous injection of batroxobin can efficiently reduce the risk for stroke/TIA recurrence in patients with concomitant hyperfibrinogenemia.  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