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   366853篇
  免费   24252篇
  国内免费   8369篇
耳鼻咽喉   4179篇
儿科学   9784篇
妇产科学   6732篇
基础医学   28901篇
口腔科学   8393篇
临床医学   39992篇
内科学   44789篇
皮肤病学   4804篇
神经病学   20320篇
特种医学   8517篇
外国民族医学   32篇
外科学   37928篇
综合类   55784篇
现状与发展   13篇
一般理论   35篇
预防医学   39060篇
眼科学   6259篇
药学   33976篇
  460篇
中国医学   35307篇
肿瘤学   14209篇
  2024年   1213篇
  2023年   5981篇
  2022年   10648篇
  2021年   14429篇
  2020年   13500篇
  2019年   19165篇
  2018年   16794篇
  2017年   13826篇
  2016年   11203篇
  2015年   10458篇
  2014年   21660篇
  2013年   22949篇
  2012年   19795篇
  2011年   21853篇
  2010年   17923篇
  2009年   15854篇
  2008年   15367篇
  2007年   15896篇
  2006年   13916篇
  2005年   11968篇
  2004年   9696篇
  2003年   8505篇
  2002年   6683篇
  2001年   5914篇
  2000年   4894篇
  1999年   4237篇
  1998年   3426篇
  1997年   3282篇
  1996年   2818篇
  1995年   2702篇
  1994年   2607篇
  1993年   2064篇
  1992年   2105篇
  1991年   1823篇
  1990年   1632篇
  1989年   1435篇
  1988年   1361篇
  1985年   3873篇
  1984年   4874篇
  1983年   3397篇
  1982年   3887篇
  1981年   3625篇
  1980年   3219篇
  1979年   2955篇
  1978年   2586篇
  1977年   1948篇
  1976年   2192篇
  1975年   1656篇
  1974年   1452篇
  1973年   1293篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
特殊部位异位妊娠的临床分析   总被引:1,自引:0,他引:1  
目的探讨特殊部位异位妊娠的临床特点,误诊原因及治疗原则。方法对1996年1月至2003年12月诊治的256例特殊部位异位妊娠进行回顾性分析。结果特殊部位异位妊娠发生率占同期异位妊娠的3.36%,术前诊断率48.4%,所有的患者均行手术。视术中情况进行不同的处理,所得标本均经病理切片证实,全部患者愈后良好。结论特殊部位异位妊娠的临床表现不典型,容易漏诊误诊,一旦怀疑本病应尽早住院,及时明确诊断并手术,患者愈后良好。  相似文献   
92.
外伤性延迟性脾破裂的诊断和治疗(附21例报告)   总被引:1,自引:0,他引:1  
目的探讨外伤性延迟性脾破裂的发病规律、临床特点、诊断和治疗方法。方法结合国内外资料及本组病例进行回顾性分析。结果明确诊断16例,误诊为肝破裂2例,宫外孕破裂2例,脾肿瘤1例。21例均手术治疗,行脾切除14例,其中保留副脾2例;脾切除加自体脾组织网膜内移植术3例;脾缝合修补术3例;脾部分切除术1例。死亡1例,原因有就诊晚、失血性休克。结论本病由于腹腔内出血与受伤时间间隔长,容易误诊。诊断除依靠病史、临床表现外,应及时进行腹腔穿刺、B超及CT检查。治疗以脾切除为主,可根据病情、脾破裂的程度以及是否有合并伤等情况采取保脾手术。  相似文献   
93.
落枕是一种冬春季常见病,虽然治疗的方法很多,但往往收不到快速、有效和彻底的效果,本文以个案经验和病例调查为基础,提供一种快速有效的自我治疗方法,并期望能够得到广大患者的进一步验证。  相似文献   
94.
For several genetic diseases two biological phenomena have been recognised as important: germline mosaicism; and different new mutation rates in males and females depending on mutation type. Both principles have been investigated separately and their influence on risk estimation in families has been exemplified in the literature. The aim of this paper is to present a general model that includes mosaicism and different new mutation rates. Mosaicism is introduced by defining additional alleles at the disease locus in combination with adapted segregation rules. Taking Duchenne muscular dystrophy as an example, we derive the conditions which have to be fulfilled for a population in mutation selection equilibrium. Our approach describes the model at the population level and not in individual subjects. This has the advantage of being able to use well known algorithms for the calculation of likelihoods in pedigrees, and to include additional diagnostic information such as marker genotypes and carrier deletion test results. We demonstrate the impact of the new model on a typical pedigree. In families where the patient is not available, the distinction between point mutations and deletions is important, since often molecular diagnostic tests for females can only screen for deletions. Negative deletion test results can now be included in the risk calculations.  相似文献   
95.
96.
97.
Objectives –  To assess long‐term functioning and disability after traumatic brain injury (TBI). Material and methods –  Individuals (n = 88) in Norrbotten, northern Sweden, who had been transferred for neurosurgical care were assessed with internationally established TBI outcome measures 6–15 years post‐injury. Results –  There was an improvement in overall outcome from discharge from inpatient rehabilitation to follow‐up. Many individuals had a high degree of motor and cognitive functioning, which enabled them to live independently in their own home without assistance, but there remained a disability related to community reintegration and social participation. This affected their productivity and to some degree their marital stability. The remaining disability and reduced productivity were related to the age at injury and the injury severity. Conclusions –  Our data showed that individuals with a TBI can achieve and maintain a high degree of functioning many years after the injury. Increasing age and a greater injury severity contributed to their long‐term disability.  相似文献   
98.
99.
100.
While much time has been spent deliberating about the definition of play, little emphasis has been placed on what children themselves perceive as play. The aim of the present study was to examine social context as a cue for children's perceptions of play and learning. Ninety-two children aged between four and six years (mean four years nine months) participated in the study and completed the Activity Apperception Story Procedure. Children were asked to sort photographic stimuli into those they believed depicted play/not play and learning/not learning. Each of the stimuli were identified by independent raters as containing one of the following social cues; teacher absence (solitary activity, parallel activity or cooperative activity) or teacher presence (teacher involved activity or teacher directed activity). Findings revealed that children associated teacher absence with play. More specifically, children made links between play and the presence of peers (parallel and cooperative activity). Findings are discussed in relation to play in the early years curriculum, differences in children's early educational experiences and the importance of understanding children's perceptions of play.  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