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   164832篇
  免费   33178篇
  国内免费   2603篇
耳鼻咽喉   5498篇
儿科学   5548篇
妇产科学   2585篇
基础医学   5868篇
口腔科学   1714篇
临床医学   27825篇
内科学   50091篇
皮肤病学   7915篇
神经病学   15828篇
特种医学   7595篇
外科学   42742篇
综合类   276篇
现状与发展   72篇
一般理论   2篇
预防医学   7391篇
眼科学   3822篇
药学   2612篇
中国医学   211篇
肿瘤学   13018篇
  2024年   513篇
  2023年   4826篇
  2022年   1446篇
  2021年   3624篇
  2020年   6286篇
  2019年   2527篇
  2018年   7822篇
  2017年   7687篇
  2016年   8896篇
  2015年   9223篇
  2014年   16456篇
  2013年   16605篇
  2012年   6943篇
  2011年   6907篇
  2010年   11264篇
  2009年   14999篇
  2008年   6806篇
  2007年   4989篇
  2006年   7316篇
  2005年   4488篇
  2004年   3608篇
  2003年   2510篇
  2002年   2499篇
  2001年   4008篇
  2000年   3215篇
  1999年   3386篇
  1998年   3714篇
  1997年   3521篇
  1996年   3397篇
  1995年   3235篇
  1994年   1968篇
  1993年   1597篇
  1992年   1410篇
  1991年   1443篇
  1990年   1085篇
  1989年   1202篇
  1988年   1035篇
  1987年   876篇
  1986年   902篇
  1985年   739篇
  1984年   553篇
  1983年   528篇
  1982年   519篇
  1981年   406篇
  1980年   365篇
  1979年   314篇
  1978年   336篇
  1977年   402篇
  1975年   280篇
  1972年   302篇
排序方式: 共有10000条查询结果,搜索用时 203 毫秒
61.
Gray platelet syndrome (GPS) is a rare (<1/1 000 000) and inherited platelet function disorder characterized by macrothrombocytopenia, α-granule deficiency, and hemorrhages. Bleeding intensity does not correlate with platelet count nor with functional test results. We hereby describe the perioperative bleeding prevention and management of a patient with GPS requiring multiple redo cardiac surgeries.  相似文献   
62.
63.
ABSTRACT

Abortion is legal in South Africa, but negative abortion attitudes remain common and are poorly understood. We used nationally representative South African Social Attitudes Survey data to analyze abortion attitudes in the case of fetal anomaly and in the case of poverty from 2007 to 2016 (n = 20,711; ages = 16+). We measured correlations between abortion attitudes and these important predictors: religiosity, attitudes about premarital sex, attitudes about preferential hiring and promotion of women, and attitudes toward family gender roles. Abortion acceptability for poverty increased over time (b = 0.05, p < .001), but not for fetal anomaly (b = ?0.008, p = .284). Highly religious South Africans reported lower abortion acceptability in both cases (Odds Ratio (OR)anomaly = 0.85, p = .015; ORpoverty = 0.84, p = .02). Premarital sex acceptability strongly and positively predicted abortion acceptability (ORanomaly = 2.63, p < .001; ORpoverty = 2.46, p < .001). Attitudes about preferential hiring and promotion of women were not associated with abortion attitudes, but favorable attitudes about working mothers were positively associated with abortion acceptability for fetal anomaly ((ORanomaly = 1.09, p = .01; ORpoverty = 1.02, p = .641)). Results suggest negative abortion attitudes remain common in South Africa and are closely tied to religiosity, traditional ideologies about sexuality, and gender role expectations about motherhood.  相似文献   
64.
65.
66.
67.
Sometimes the clinical differentiation between verruca plana (VP) and VP‐like seborrheic keratosis (SK) could be challenged. However, there have been no studies on this issue to date. The aim of this study was to elucidate clinical and dermoscopic differences between these two diseases, and also to suggest a diagnostic algorithm of VP and VP‐like SK without skin biopsy. The patients who had lesions clinically considered as VP or VP‐like SK were the target of our study. We took clinical and dermoscopic photos with informed consent and conducted a questionnaire. All patients had their diagnoses confirmed by biopsy. Thirty‐three patients were enrolled in our study. Seventeen patients were finally diagnosed with VP (51.5%) and 16 patients with VP‐like SK (48.5%). In clinical findings, VP‐like SK showed significantly more scattered distribution than VP (P = 0.039), which exhibited more clustered or grouped distribution (P = 0.039). In dermoscopic findings, brain‐like appearance was more commonly observed in VP‐like SK (P = 0.003) whereas VP showed more red dots or globular vessels (P = 0.017) and even‐colored light brown to yellow patch (P < 0.001). Sex, onset age, the size of each lesion, location, color and shape showed no significant differences between them (P > 0.05). Based on our results, we suggest a diagnostic algorithm using Koebner's phenomenon, dermoscopic findings, distribution of each lesion and biopsy for multiple VP‐like lesions in adults, and we think it will be a very useful diagnostic tool in daily clinical dermatological practice.  相似文献   
68.
69.
The growth of online support groups has led to an expression effects paradigm within the health communication literature. Although religious support expression is characterized as a typical subdimension of emotional support, we argue that in the context of a life-threatening illness, the inclusion of a religious component creates a unique communication process. Using data from an online group for women with breast cancer, we test a theoretical expression effects model. Results demonstrate that for breast cancer patients, religious support expression has distinct effects from general emotional support messages, which highlights the need to further theorize expression effects along these lines.  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