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   183130篇
  免费   42258篇
  国内免费   2476篇
耳鼻咽喉   5310篇
儿科学   5707篇
妇产科学   3912篇
基础医学   3745篇
口腔科学   6110篇
临床医学   41642篇
内科学   51272篇
皮肤病学   7819篇
神经病学   16988篇
特种医学   7155篇
外科学   43476篇
综合类   278篇
现状与发展   79篇
预防医学   15708篇
眼科学   4399篇
药学   1294篇
中国医学   10篇
肿瘤学   12960篇
  2024年   720篇
  2023年   6662篇
  2022年   1367篇
  2021年   3609篇
  2020年   7392篇
  2019年   2584篇
  2018年   9587篇
  2017年   9985篇
  2016年   11027篇
  2015年   11227篇
  2014年   18628篇
  2013年   20411篇
  2012年   6422篇
  2011年   6489篇
  2010年   12204篇
  2009年   16733篇
  2008年   6774篇
  2007年   4847篇
  2006年   7593篇
  2005年   4484篇
  2004年   3554篇
  2003年   2454篇
  2002年   2489篇
  2001年   4491篇
  2000年   3395篇
  1999年   3871篇
  1998年   4505篇
  1997年   4299篇
  1996年   4252篇
  1995年   3922篇
  1994年   2529篇
  1993年   2082篇
  1992年   1795篇
  1991年   1729篇
  1990年   1382篇
  1989年   1465篇
  1988年   1285篇
  1987年   1067篇
  1986年   1077篇
  1985年   886篇
  1984年   702篇
  1983年   690篇
  1982年   634篇
  1981年   516篇
  1980年   420篇
  1979年   336篇
  1978年   381篇
  1977年   457篇
  1975年   316篇
  1972年   344篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
62.
63.
64.
65.
66.
67.
Breast elastography has been available for more than 15 years but is not widely incorporated into clinical practice. Many publications report extremely high accuracy for various breast elastographic techniques. However, results in the literature are extremely variable. This variability is most likely due to variations in technique, a relatively steep learning curve, and variability in methods between vendors. This article describes our protocol for performing breast elastography using both strain elastography and shear wave elastography, which produces high sensitivity and specificity. Additionally, we will describe the most commonly known false-positive and false-negative lesions as well as how to detect them.  相似文献   
68.
The midwifery art has emphasised the uniqueness of human beings throughout its Nordic history. The educated Nordic midwife has in the last decade celebrated several hundred years of memories. This article studies how the key ideas of the midwifery art and patterns of ideas become evident in the zeitgeist from the beginning of the 19th century to the millennium in the Nordic countries. The legacy and pattern of ideas of the art of midwifery are interpreted in relation to the texts of the selected historical sources and based on Ricoeur's phenomenological-hermeneutic approach to the text and further to the dedication of understanding and interpretation. The historical sources refer to unprinted primary sources from historical archives and printed secondary and tertiary sources. The patterns of ideas include a tripartite whole: the true cultivation of the head, the philosophy and aesthetics of the hand, the strength of the heart and the drive of calling. These ideas open for unique visions and attest to the evident in modern midwives. Today's midwives have academic training with examinations, and the education is based on scientific evidence. The midwife profession is authorised by the state and supervised by the authorities.  相似文献   
69.
The term “oligometastatic prostate cancer” refers to a heterogeneous group of disease states currently defined solely on the basis of clinical features. Oligorecurrent disease, de novo oligometastases, and oligoprogressive disease likely have unique biologic underpinnings and natural histories. Evidence suggesting the existence of a subset of patients who harbor prostate cancer with limited metastatic potential currently includes disparate and overwhelmingly retrospective reports. Nevertheless, emerging prospective data have corroborated the “better-than-expected,” retrospectively observed outcomes, particularly in the setting of oligorecurrent prostate cancer. Improved functional imaging with prostate-specific membrane antigen-targeted strategies may enhance the identification of patients with oligometastatic prostate cancer in the short term. In the long term, refinement of the oligometastatic case definition likely will require biologic risk-stratification schemes. To determine optimal treatment strategies and identify patients most likely to benefit from metastasis-directed therapy, future efforts should focus on conducting high-quality, prospective trials with much-needed molecular correlative studies.  相似文献   
70.
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