全文获取类型
收费全文 | 90537篇 |
免费 | 8738篇 |
国内免费 | 556篇 |
专业分类
耳鼻咽喉 | 258篇 |
儿科学 | 2014篇 |
妇产科学 | 1708篇 |
基础医学 | 5531篇 |
口腔科学 | 4416篇 |
临床医学 | 16221篇 |
内科学 | 7889篇 |
皮肤病学 | 621篇 |
神经病学 | 4990篇 |
特种医学 | 849篇 |
外科学 | 3452篇 |
综合类 | 8468篇 |
现状与发展 | 3篇 |
一般理论 | 90篇 |
预防医学 | 36890篇 |
眼科学 | 337篇 |
药学 | 3151篇 |
82篇 | |
中国医学 | 859篇 |
肿瘤学 | 2002篇 |
出版年
2024年 | 350篇 |
2023年 | 2780篇 |
2022年 | 3600篇 |
2021年 | 5025篇 |
2020年 | 5071篇 |
2019年 | 5113篇 |
2018年 | 4358篇 |
2017年 | 4027篇 |
2016年 | 3805篇 |
2015年 | 3756篇 |
2014年 | 5943篇 |
2013年 | 7742篇 |
2012年 | 5236篇 |
2011年 | 5627篇 |
2010年 | 4159篇 |
2009年 | 4306篇 |
2008年 | 4151篇 |
2007年 | 4162篇 |
2006年 | 3553篇 |
2005年 | 2722篇 |
2004年 | 2363篇 |
2003年 | 2030篇 |
2002年 | 1532篇 |
2001年 | 1466篇 |
2000年 | 1260篇 |
1999年 | 878篇 |
1998年 | 742篇 |
1997年 | 581篇 |
1996年 | 487篇 |
1995年 | 340篇 |
1994年 | 319篇 |
1993年 | 322篇 |
1992年 | 265篇 |
1991年 | 222篇 |
1990年 | 181篇 |
1989年 | 142篇 |
1988年 | 172篇 |
1987年 | 114篇 |
1986年 | 100篇 |
1985年 | 123篇 |
1984年 | 102篇 |
1983年 | 70篇 |
1982年 | 71篇 |
1981年 | 65篇 |
1980年 | 63篇 |
1979年 | 56篇 |
1978年 | 58篇 |
1977年 | 57篇 |
1976年 | 51篇 |
1975年 | 46篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
41.
D. Locker 《Community dentistry and oral epidemiology》1997,25(3):199-203
Abstract Although numerous investigators have reported on self-perceived oral health status in adult and older adult populations, few have examined how these perceptions change over time. This paper uses data from a longitudinal oral health survey of community-dwelling Canadians aged 50 years and over to explore this issue. Data were collected at baseline and after 3 years. Change was assessed using a global transition judgement and change scores on four subjective oral health status indicators. These indicators addressed chewing capacity, oral and facial pain symptoms, other oral symptoms, and the psychosocial impact of oral disorders. Overall, 23.0% reported that their oral health had worsened over this period, 66.5% that it had remained the same and 10.5% that it had improved. Change scores on the four indicators showed a similar pattern and were significantly associated with these global judgements. Over the same period, substantial proportions lost one or more teeth, acquired new coronal or root DPS increments or experienced loss of periodontal attachment. An additional 17% complained of dry mouth. However, the only clinical indicator associated with changing perceptions of oral health was tooth loss. Of interest was the fact that rates of tooth loss were equally high among those who reported a worsening of oral health and those who reported an improvement. This suggests that the impact of tooth loss on health status may be positive or negative depending upon the condition of the teeth lost. 相似文献
42.
Guidotti T. L.; Watson L.; Wheeler M.; Jhangri G. S. 《Occupational medicine (Oxford, England)》1996,46(4):265-274
This is the first round in a series of surveys conducted inFort McMurray as part of the Fort McMurray Demonstration Projectin social marketing. This component of the survey was intendedto focus on the most prominent group of employed workers inthe community and to compare their patterns of response withthe community as a whole. Respondents to the survey were overwhelminglymale (96%), married (72.9%) and living in households of twoto five persons (87.9%). They were predominantly aged 30–44(55%) and graduates of high school (53.5%). Younger male workers(below age 30) were more likely to have a high school diploma(78.3%) or some additional technical or vocational training(21.7% compared to 12.5% overall) and to be unmarried or separated.Attitudes toward safety-related behaviours were stronger thanfor respondents from the community as a whole. Approximately70–100% of all age groups and both sexes showed strongagreement with attitudes involving child car seats and the unacceptabilityof drinking and driving. These attitudes include strong advocacyof vigorous enforcement of occupational health and safety standards.However, they showed a variability similar to the communityas a whole in behaviour at home compared to work, generallyreporting more consistent use of personal protection on thejob than in their own homes, particularly hearing protection.Even so, they were much less likely to perform stretching andwarm-up exercises prior to exertion than community residentsin general. The potential may exist to transfer the technologyand attitudes from workplace health and safety to communitysafety. One possible strategy to accomplish this is to involveworkers in this industry directly in community initiatives.This strategy may be generalizable to any community in whichthere are major employers who place a heavy emphasis on riskcontrol and occupational health and safety. 相似文献
43.
A. T. McWILLIAMS 《Medical education》1988,22(2):99-103
Medical students are allocated little curriculum time for exposure to expert systems. ESTA, a computer model of an expert system, was developed to make best use of this time. The nature of the students' interaction with ESTA is described, and their reactions to the expert system concepts and the place of expert systems in medicine are presented. A discussion of these reactions draws some conclusions about teaching expert systems in particular, and computers in general, in the basic medical course. 相似文献
44.
D. I. NEWBLE 《Medical education》1988,22(3):200-204
A structured clinical examination has been an integral component of the final-year examinations conducted by the Departments of Medicine and Surgery at the University of Adelaide for the last 8 years. It has been used as an alternative to the traditional clinical examination. This paper describes the results of ongoing student and examiner surveys carried out to determine their views and satisfaction with this new approach. It also briefly discusses the feasibility of introducing such an examination into a conventional medical school environment. The surveys showed a remarkable level of acceptance and support by both students and examiners. This positive reaction has been maintained over the 8-year period. The main reasons seem to be its perceived relevance and fairness. Students also appear to be directing their learning in a direction thought desirable by teachers. No significant problems have been encountered with the practical implementation of the method. 相似文献
45.
P. V. PEPLOW 《Medical education》1990,24(5):426-432
This paper reports an attempt to develop self-directed learning skills in second-year medical students by introducing case-based projects into the gross anatomy course at a long-established medical school. The programme and students' responses to a questionnaire completed at the end of the year are presented. Information on the various resources used by students to find information is given. The performance of students in the case-based components of the course has been evaluated and also in the more traditional end-of-year written examination. The data confirm that students have recognized that the projects were about obtaining a deeper understanding of the anatomy, and the programme appears to have promoted the use and study of library texts. 相似文献
46.
47.
This paper describes a teaching programme for final- (sixth-) year undergraduate medical students during their 10-week term in child health. Students attend schools on two occasions and are actively involved in the physical, educational and emotional assessment of children. The advantages of the programme include active participation by the students, contact with children in a less threatening environment, learning new skills in the assessment of children, and knowledge of common screening procedures. Student evaluation of the programme has been positive. 相似文献
48.
Pia Andersson RDH Ingalill R. Hallberg RNT PhD Stefan Renvert DDS PhD 《Special care in dentistry》2002,22(5):181-186
The aim of this study was to test the inter-rater reliability of a revised oral assessment guide (ROAG) for patients residing in a geriatric rehabilitation ward. A consecutive sample of 140 patients was recruited for the study. Oral assessments were performed for 133 newly admitted patients by one registered nurse (RN) during a period of six months. A dental hygienist (DH) carried out 103 oral assessments during the same half-year. For 66 patients, the RN and the DH performed independent assessments. There was an agreement between the RN and the DH in the majority of the independent assessments, except for tongue and teeth/dentures. The percentage agreement exceeded 80 percent. Inter-rater agreement measured by Cohen's Kappa coefficient ranged from moderate to very good and percentage agreement had a range of 58 to 91 percent. The agreement was highest in assessment of voice and swallowing (91%). Assessments of teeth and dentures seemed to be most difficult for the RN to evaluate. ROAG was found to be a clinically useful assessment tool. Additional education and training is needed to improve the reliability of the oral assessments and should include continuous support from a dental hygienist as well as a pictorial manual on how to use the ROAG. 相似文献
49.
50.