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   13271篇
  免费   898篇
  国内免费   264篇
耳鼻咽喉   1531篇
儿科学   277篇
妇产科学   188篇
基础医学   851篇
口腔科学   340篇
临床医学   2196篇
内科学   1130篇
皮肤病学   101篇
神经病学   472篇
特种医学   1075篇
外科学   1095篇
综合类   1630篇
现状与发展   2篇
一般理论   4篇
预防医学   1368篇
眼科学   112篇
药学   1135篇
  10篇
中国医学   613篇
肿瘤学   303篇
  2024年   27篇
  2023年   208篇
  2022年   382篇
  2021年   720篇
  2020年   569篇
  2019年   529篇
  2018年   505篇
  2017年   472篇
  2016年   555篇
  2015年   498篇
  2014年   996篇
  2013年   1008篇
  2012年   832篇
  2011年   832篇
  2010年   719篇
  2009年   665篇
  2008年   612篇
  2007年   625篇
  2006年   563篇
  2005年   421篇
  2004年   356篇
  2003年   312篇
  2002年   247篇
  2001年   245篇
  2000年   196篇
  1999年   174篇
  1998年   131篇
  1997年   122篇
  1996年   97篇
  1995年   75篇
  1994年   114篇
  1993年   58篇
  1992年   69篇
  1991年   42篇
  1990年   58篇
  1989年   43篇
  1988年   44篇
  1987年   33篇
  1986年   30篇
  1985年   45篇
  1984年   43篇
  1983年   26篇
  1982年   41篇
  1981年   18篇
  1980年   16篇
  1979年   13篇
  1978年   21篇
  1977年   7篇
  1976年   6篇
  1975年   7篇
排序方式: 共有10000条查询结果,搜索用时 296 毫秒
1.
The purpose of this study was to investigate the association between habitual snoring (HS), middle ear disease (MED), and speech problems in children with cleft palate. This cross-sectional study included children aged 2.0–7.9 years with non-syndromic cleft palate anomalies. Parents completed the Pediatric Sleep Questionnaire and a questionnaire about MED. Audiograms and speech assessment were also conducted. Ninety-five children were enrolled; 15.2% of families reported HS, 97.6% MED, and 17.1% speech problems. HS (37.5% vs 10.3%, P = 0.007) and early episodes of MED (92.3% vs 58.2%, P = 0.021) were more likely to be reported for children with isolated cleft palate when compared to those with cleft lip and palate. Children with cleft lip and palate had a higher frequency of MED with effusion compared to those with Robin sequence (86.4% vs 57.1%, P = 0.049). The odds ratio for HS in children with ≥1 episode of MED in the last year was 7.37 (95% confidence interval 1.55–35.15, P = 0.012). There was a trend for children with speech problems reported by parents to have HS (30.8% vs 11.5%, P= 0.076). Anatomical factors play a role in the frequency of upper airway symptoms in children with cleft palate. A recent history of at least one episode of MED was associated with an increased frequency of HS.  相似文献   
2.
3.
4.
This study explored the relationship between active mediation, exposure to Daniel Tiger’s Neighborhood, and key indicators of preschoolers’ social and emotional development. One hundred and twenty-seven children aged 2–6 either watched or did not watch 10 episodes of Daniel Tiger’s Neighborhood over a two-week period. Results revealed that preschoolers who watched the program exhibited higher levels of empathy, self-efficacy, and emotion recognition when their regular TV-watching experiences are frequently accompanied by active mediation. This was especially true for younger preschoolers and preschoolers from low-income families. Implications for policy-makers, parents, producers of prosocial programming, and educators are discussed.  相似文献   
5.
ObjectivesTo review the evidence pertaining to the association between cow’s milk protein allergy and recurrent acute otitis media and otitis media with effusion.MethodsThe CENTRAL, Web of Science, EMBASE, MEDLINE, LILACS databases, and gray literature were searched.ResultsFour studies were included, identifying the prevalence rates: 0.2% of delayed speech due to chronic otitis media with effusion in 382 children with cow’s milk protein allergy, 10.7% of cow’s milk protein allergy in 242 children who underwent ENT procedures, 40% of cow’s milk protein allergy in 25 children with recurrent otitis media with effusion and higher tendency to otitis media in children with cow’s milk protein allergy of 186 children (1.5 + 0.6 vs. 0.4 + 0.1; p < 0.1).ConclusionConsidering the characteristics and methodological variations of the identified studies, it is not possible to state that there is reliable evidence of an association between cow’s milk protein allergy and otitis media.  相似文献   
6.
《Vaccine》2022,40(43):6255-6270
Swine influenza A virus (swIAV) infections in pig populations cause considerable morbidity and economic losses. Frequent reverse zoonotic incursions of human IAV boost reassortment opportunities with authentic porcine and avian-like IAV in swine herds potentially enhancing zoonotic and even pre-pandemic potential. Vaccination using adjuvanted inactivated full virus vaccines is frequently used in attempting control of swIAV infections. Accelerated antigenic drift of swIAV in large swine holdings and interference of maternal antibodies with vaccine in piglets can compromise these efforts. Potentially more efficacious modified live-attenuated vaccines (MLVs) bear the risk of reversion of MLV to virulence. Here we evaluated new MLV candidates based on cold-passaged swIAV or on reassortment-incompetent bat-IAV-swIAV chimeric viruses. Serial cold-passaging of various swIAV subtypes did not yield unambiguously temperature-sensitive mutants although safety studies in mice and pigs suggested some degree of attenuation. Chimeric bat-swIAV expressing the hemagglutinin and neuraminidase of an avian-like H1N1, in contrast, proved to be safe in mice and pigs, and a single nasal inoculation induced protective immunity against homologous challenge in pigs. Reassortant-incompetent chimeric bat-swIAV vaccines could aid in reducing the amount of swIAV circulating in pig populations, thereby increasing animal welfare, limiting economic losses and lowering the risk of zoonotic swIAV transmission.  相似文献   
7.
8.
9.
在现代传媒背景下,媒介素养水平高低直接影响着医药专业人才的培养质量和未来我国医药卫生事业发展。本文探讨国内外媒介素养教育开展情况,分析医药院校大学生媒介素养教育的必要性,提出了在医药院校加强媒介素养教育的新思路。  相似文献   
10.
《Surgery (Oxford)》2021,39(9):591-597
Infections of the ear, nose and throat are common. The majority of these infections are managed by the primary care physicians and they settle with conservative and medical management. However, a small group can progress to become troublesome and develop complications to the extent that they may require surgical intervention. Some of the infections can lead to life-threatening complications, therefore awareness and correct diagnosis along with appropriate management is paramount. Foreign bodies in the ear, nose and throat are commonly encountered. The location and type of foreign body can have an implication on the urgency of action and the possible complications. In this article the common ENT infections and foreign bodies and their management are discussed.  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