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   10008篇
  免费   739篇
  国内免费   45篇
耳鼻咽喉   105篇
儿科学   390篇
妇产科学   230篇
基础医学   1162篇
口腔科学   278篇
临床医学   833篇
内科学   2647篇
皮肤病学   185篇
神经病学   506篇
特种医学   237篇
外国民族医学   4篇
外科学   1388篇
综合类   283篇
一般理论   5篇
预防医学   712篇
眼科学   321篇
药学   754篇
中国医学   102篇
肿瘤学   650篇
  2023年   110篇
  2022年   225篇
  2021年   500篇
  2020年   253篇
  2019年   321篇
  2018年   363篇
  2017年   267篇
  2016年   309篇
  2015年   331篇
  2014年   440篇
  2013年   499篇
  2012年   762篇
  2011年   805篇
  2010年   409篇
  2009年   353篇
  2008年   545篇
  2007年   481篇
  2006年   461篇
  2005年   433篇
  2004年   396篇
  2003年   339篇
  2002年   325篇
  2001年   127篇
  2000年   153篇
  1999年   143篇
  1998年   76篇
  1997年   63篇
  1996年   53篇
  1995年   44篇
  1994年   40篇
  1993年   33篇
  1992年   113篇
  1991年   62篇
  1990年   85篇
  1989年   80篇
  1988年   92篇
  1987年   78篇
  1986年   67篇
  1985年   68篇
  1984年   44篇
  1983年   35篇
  1982年   31篇
  1981年   31篇
  1979年   54篇
  1978年   22篇
  1977年   23篇
  1974年   21篇
  1973年   21篇
  1972年   21篇
  1969年   21篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
5.
6.
7.
The objective of the study was to evaluate the reliability of sonoelastography in ductal carcinoma in patients in primary and secondary health care settings. Google Scholar, PubMed, Medline, Medscape, Wikipedia and NCBI were searched in January 2018 for all original research and review articles to identify relevant studies. Two reviewers selected the articles independently for based on the title and abstract. The selection criteria were sonoelastography accuracy for diagnosing ductal carcinoma as index text, B-mode sonography, and micropure imaging; surgery and histologic findings were used as reference text; and benign and malignant breast abnormalities and ductal carcinoma were used as target conditions. Two reviewers extracted the data on selected study characteristics, and the results were used to construct the tables and figures. Fifteen studies on ductal carcinoma were found. The overall sensitivity of sonoelastography in diagnosing ductal carcinoma was 85.7%, and the specificity, 79.8%. On the basis of the literature review, it was concluded that sonoelastography has high sensitivity and specificity in diagnosing ductal carcinoma.  相似文献   
8.
Multi-day signals, generally with duration of 2-10 days, are a prominent temporal variation type of radon (Rn) in geogas in the unsaturated zone. Rare multi-day Rn signals have been found which are characterized by: (a) a declining limb lasting up to 10 days which conforms to the radioactive decay of Rn, (b) recurs at the same location and (c) is recorded in diverse situations-volcanic and seismogenic. It suggested that a Rn blob is injected at a lower level on a steady upward flow of geogas whereby the rise and final fall of the signal are attributed to the edges of the blob while the central Rn-decay segment records the passing of the decaying blob itself. Rn-decay signals are a small subset of multi-day Rn signals which are considered as highly irregular and unusable for the understanding of geophysical processes. In difference, it is concluded that multi-day Rn signals are probably proxies of subtle geodynamic processes at upper crustal levels and are therefore significant for studying such processes.  相似文献   
9.
In cases of cerebrospinal fluid (CSF) rhinorrhea following lateral skull base surgery, fibrosis and fibrin formation resulting from meningitis has been postulated as a mechanism of spontaneously resolving the CSF leak. This study was undertaken to explore any possible relationship between the cessation of CSF leak and meningitis. A retrospective study at a tertiary referral center of 232 consecutive patients was performed. Out of a total of 232 procedures, 29 patients developed CSF rhinorrhea, of whom 7 subsequently developed meningitis. Bacteria were isolated in CSF obtained at lumbar puncture in 5 cases, with the CSF analysis in the remaining 2 cases suggesting aseptic meningitis. Conservative treatment failed to stop the CSF rhinorrhea in 6 of 7 cases. In this study, the development of meningitis did not appear to aid in the resolution of the CSF rhinorrhea. We conclude that surgical intervention should not be delayed in the expectation that meningitis and conservative interventions may promote CSF leak resolution.  相似文献   
10.
Xanthogranulomatous orchitis is an extremely rare inflammatory non-neoplastic destructive lesion of the testis. We report a 44-year-old man who presented with right scrotal swelling and two discharging sinuses. Testicular tumor markers were normal. Scrotal ultrasound showed heterogeneous testicular areas and irregular margin of the tunica. Surgical exploration revealed infected, unhealthy testicular tissue with necrosis and tumor-like lesion. Orchidectomy was done and histopathology showed xanthogranulomatous orchitis.  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