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   682543篇
  免费   41351篇
  国内免费   977篇
耳鼻咽喉   9183篇
儿科学   21573篇
妇产科学   17446篇
基础医学   109459篇
口腔科学   20287篇
临床医学   54355篇
内科学   131254篇
皮肤病学   16915篇
神经病学   50169篇
特种医学   22484篇
外国民族医学   63篇
外科学   96675篇
综合类   9293篇
一般理论   152篇
预防医学   58496篇
眼科学   16689篇
药学   53521篇
中国医学   1751篇
肿瘤学   35106篇
  2021年   6038篇
  2019年   6760篇
  2018年   10349篇
  2017年   7004篇
  2016年   7401篇
  2015年   8110篇
  2014年   10242篇
  2013年   15969篇
  2012年   23826篇
  2011年   25946篇
  2010年   14113篇
  2009年   11980篇
  2008年   23134篇
  2007年   24834篇
  2006年   24500篇
  2005年   23596篇
  2004年   22562篇
  2003年   21381篇
  2002年   20816篇
  2001年   28834篇
  2000年   30501篇
  1999年   24435篇
  1998年   6258篇
  1997年   5253篇
  1996年   5560篇
  1995年   5072篇
  1992年   17640篇
  1991年   18013篇
  1990年   18117篇
  1989年   17252篇
  1988年   15943篇
  1987年   15697篇
  1986年   14882篇
  1985年   14165篇
  1984年   10512篇
  1983年   9026篇
  1979年   10436篇
  1978年   7554篇
  1977年   6458篇
  1976年   6250篇
  1975年   7163篇
  1974年   8577篇
  1973年   8121篇
  1972年   7936篇
  1971年   7626篇
  1970年   7038篇
  1969年   6809篇
  1968年   6515篇
  1967年   5860篇
  1966年   5226篇
排序方式: 共有10000条查询结果,搜索用时 265 毫秒
91.
92.
Tuberculosis (TB) remains one of a major health problem worldwide. Tuberculosis vaccine research has made an extraordinary progress over the past few years. However, there is still no replacement for the Bacillus Calmette‐Guérin vaccine, the only TB vaccine licensed for human use. Therefore, the discovery and development of new TB vaccines remains a priority. This article discusses current strategies used to diversify TB vaccines and includes discussion of the status of efforts to improve protection against Mycobacterium tuberculosis (M tb) infection or TB disease by developing new and safe TB vaccines. This article also highlights the current research efforts in immune‐enhancing approaches to improve vaccination efficacy. The development of more effective TB vaccines might have significant impact on global TB control.  相似文献   
93.
Rheological behaviour of pharmaceutical semisolid preparations significantly affects manufacturing process, administration, stability, homogeneity of incorporated drug, accuracy of dosing, adhesion in the place of application, drug release, and resulting therapeutic effect of the product. We performed test of consistency by penetrometry, rotational, oscillation and creep tests, and squeeze and tack tests of model samples to introduce methods suitable for characterization and comparison of semisolids in practice. Penetrometry is a simple method allowing sorting the semisolids to low and high stress-resistant materials but deficient for rheological characterization of semisolids. Value of yield stress, generally considered to be appropriate feature of semisolids, is significantly influenced by the method of testing and the way of evaluation. The hysteresis loops of model semisolids revealed incomplete thixotropy, therefore, three-step thixotropy test was employed. Semisolids showed nonlinear response in the creep phase of tests and partial recovery of structure by storing energy in the recovery phase. Squeeze and tack tests seem to be convenient ways for comparison of semisolids. Our study can contribute to a better understanding of different flow behaviour of semisolids given by different physicochemical properties of excipients and can bring useful approaches to evaluation and comparison of semisolids in practice.  相似文献   
94.
95.
Bulletin of Experimental Biology and Medicine - Fast neutron therapy, which previously has demonstrated effective results, but along with a large number of complications, can again be considered a...  相似文献   
96.
Background: Most theoretical models of self-determination suggest that both environmental and personal factors influence the development of self-determination. The design and implementation of interventions must be conducted with foreknowledge of such mediating and moderating factors if the intervention is to be successful.

Methods: The purpose of this study was to examine the degree to which several personal factors and school characteristics affect and explain students’ self-determination. A total of 232 students with intellectual disability from Spain participated. Their self-determination level was assessed by the ARC-INICO Scale.

Results: Students with moderate levels of intellectual disability obtained significantly lower scores on self-determination than their peers with mild intellectual disability. There were significant differences in relation to the level of support needs and their experience with transition programs. The level of support needs was a significant predictor.

Conclusion: These findings contribute to current research in this field and practical implications were discussed.  相似文献   

97.
98.
Journal of Digital Imaging - Vertebral Compression Fracture (VCF) occurs when the vertebral body partially collapses under the action of compressive forces. Non-traumatic VCFs can be secondary to...  相似文献   
99.
Clinical Rheumatology - We aimed to estimate the frequency of overlap of antineutrophil cytoplasmic antibody (ANCA)-associated vasculitis (AAV) with systemic autoimmune diseases. Retrospective...  相似文献   
100.
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