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   190587篇
  免费   14251篇
  国内免费   6528篇
耳鼻咽喉   1937篇
儿科学   3439篇
妇产科学   4006篇
基础医学   21050篇
口腔科学   3670篇
临床医学   21821篇
内科学   32233篇
皮肤病学   2320篇
神经病学   12150篇
特种医学   6177篇
外国民族医学   44篇
外科学   23273篇
综合类   20456篇
现状与发展   21篇
一般理论   86篇
预防医学   14654篇
眼科学   4677篇
药学   17121篇
  153篇
中国医学   6894篇
肿瘤学   15184篇
  2024年   1610篇
  2023年   2454篇
  2022年   4627篇
  2021年   6595篇
  2020年   5009篇
  2019年   5015篇
  2018年   5120篇
  2017年   4564篇
  2016年   4275篇
  2015年   6252篇
  2014年   8371篇
  2013年   9377篇
  2012年   13657篇
  2011年   14705篇
  2010年   9646篇
  2009年   8154篇
  2008年   11257篇
  2007年   11361篇
  2006年   10936篇
  2005年   10410篇
  2004年   8489篇
  2003年   7733篇
  2002年   6919篇
  2001年   3560篇
  2000年   3204篇
  1999年   3202篇
  1998年   2048篇
  1997年   1857篇
  1996年   1556篇
  1995年   1485篇
  1994年   1363篇
  1993年   941篇
  1992年   1247篇
  1991年   1166篇
  1990年   965篇
  1989年   873篇
  1988年   813篇
  1987年   722篇
  1986年   611篇
  1985年   585篇
  1984年   652篇
  1983年   565篇
  1982年   617篇
  1981年   601篇
  1980年   562篇
  1979年   391篇
  1978年   402篇
  1977年   367篇
  1976年   285篇
  1974年   329篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
The authors report a new case of abdominal pregnancy with living baby. The analysis of this observation permits to present then the clinical and paraclinical characteristics of this exceptional localization of pregnancy and emphasize the surgical principles involved with its treatment, around the time of the term delivery.  相似文献   
42.
A patient with skeletal Class III malocclusion was treated in 2 phases during the early permanent dentition. In phase 1, maxillary protraction was combined with rapid palatal expansion; in phase 2, fixed appliances were placed. The results were good posttreatment, and, 1 year later, a favorable growth tendency could be observed. This report shows that treatment for a patient with skeletal Class III malocclusion can be started in the early permanent dentition, with very good final results.  相似文献   
43.
44.
Although many monoclonal antibodies have been made in human colon cancer, none of them are from the Chinese species. Recently, a colon cancer cell line CC-M2 established from a Chinese patient has been completely characterized and used as immunogen to produce monoclonal antibodies. Monoclonal antibodies were produced by standard hybridoma technique. The fusion rate was 95.8%. An isotype IgG1 of high proliferation named as Sam-2 was used in this study. The titers were measured around 10(4). Further studies on MoAb Sam-2 through indirect immunofluorescent and immunoperoxidase tests revealed its good specificity and sensitivity in colorectal cancer tissue. In CEA study, the result indicated that Sam-2 may react on a non-CEA related antigen. For further clinical application, the antigen was identified as a glycoprotein by chemical resistant test. In preliminary studies using sodium dodecyl sulfate-polyacrylamide gel electrophoresis and immunoblotting techniques, Sam-2 could recognize two closed antigens or a dimer antigen with molecular weight 25.2 and 27 Kd respectively.  相似文献   
45.
Irritability is often a problem for patients with Post-Traumatic Stress Disorder (PTSD). We describe two cases that illustrate the use of lithium in the treatment of veterans with PTSD who complained of serious problems with irritability or angry outbursts. These cases are discussed in the context of evidence that lithium may be useful in other patients with disorders of impulse control. The evidence linking disorders of anger and impulse control to a dysregulation in neurotransmitter regulation, particularly in serotonergic pathways, supports a psychopharmacologic approach to treatment. These findings should lead to further study of the role of lithium in the treatment of this symptom complex in patients with PTSD.  相似文献   
46.
There are conflicting reports on the relationship between cerebellar vermal lobule hypoplasia and autism. Using quantitative magnetic resonance image analysis, we measured the cerebellar vermis in 125 normal individuals with a broad age range and 102 patients with a variety of neurogenetic abnormalities. We conclude that hypoplasia of cerebellar vermal lobules VI and VII is a nonspecific finding that even occurs in several conditions without autistic behavior. This suggests that it is not a specific neuroanatomical marker for autism, nor is cerebellar dys- genesis likely to be solely responsible for clinical autistic behaviors.  相似文献   
47.
A high incidence of bladder cancer has been documented in an area of chronic arsenic (As) exposure. This study investigates the characteristics of As-associated (n = 49) and other (n = 64) bladder cancers. A higher histological grading was observed for the As-exposed tumours (P = 0.04), but no other difference in pathobiological features or prognosis was found between the two groups.  相似文献   
48.
49.
目的 探索对海洛因依赖重度药瘾较理想的戒毒治疗方法。  方法 采用美沙酮与丁丙诺啡联合用药方案 ,对海洛因依赖重度药瘾 41例行戒毒治疗 ,1 2天为一疗程 ,并与单用美沙酮组 2 0例进行比较。  结果 联合用药组控制症状较彻底 ,鸦片类药物戒断症状量表 (OWS)总分平稳下降 ,症状波动小 ,减药顺利 ,两药替换平稳 ,戒毒成功率 73 2 %。  结论 我们认为美沙酮联用丁丙诺啡是一种值得推荐的戒毒治疗方法。  相似文献   
50.
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