全文获取类型
收费全文 | 1355669篇 |
免费 | 113156篇 |
国内免费 | 6390篇 |
专业分类
耳鼻咽喉 | 17032篇 |
儿科学 | 43506篇 |
妇产科学 | 36841篇 |
基础医学 | 186090篇 |
口腔科学 | 36665篇 |
临床医学 | 122181篇 |
内科学 | 281695篇 |
皮肤病学 | 32218篇 |
神经病学 | 112184篇 |
特种医学 | 56308篇 |
外国民族医学 | 286篇 |
外科学 | 212778篇 |
综合类 | 31681篇 |
现状与发展 | 2篇 |
一般理论 | 418篇 |
预防医学 | 107898篇 |
眼科学 | 28699篇 |
药学 | 94799篇 |
5篇 | |
中国医学 | 2265篇 |
肿瘤学 | 71664篇 |
出版年
2018年 | 13631篇 |
2017年 | 10830篇 |
2016年 | 13020篇 |
2015年 | 14579篇 |
2014年 | 20304篇 |
2013年 | 30246篇 |
2012年 | 36975篇 |
2011年 | 39619篇 |
2010年 | 24826篇 |
2009年 | 24310篇 |
2008年 | 37047篇 |
2007年 | 39531篇 |
2006年 | 40594篇 |
2005年 | 39183篇 |
2004年 | 37373篇 |
2003年 | 36416篇 |
2002年 | 34443篇 |
2001年 | 66548篇 |
2000年 | 68418篇 |
1999年 | 57032篇 |
1998年 | 16934篇 |
1997年 | 15217篇 |
1996年 | 16177篇 |
1995年 | 16370篇 |
1994年 | 15221篇 |
1993年 | 14262篇 |
1992年 | 47414篇 |
1991年 | 46060篇 |
1990年 | 44260篇 |
1989年 | 42076篇 |
1988年 | 39044篇 |
1987年 | 38340篇 |
1986年 | 36118篇 |
1985年 | 34846篇 |
1984年 | 26543篇 |
1983年 | 22252篇 |
1982年 | 13956篇 |
1981年 | 12554篇 |
1980年 | 11820篇 |
1979年 | 23720篇 |
1978年 | 17192篇 |
1977年 | 14512篇 |
1976年 | 13297篇 |
1975年 | 13831篇 |
1974年 | 16237篇 |
1973年 | 15512篇 |
1972年 | 14284篇 |
1971年 | 13132篇 |
1970年 | 11986篇 |
1969年 | 11206篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
992.
M M O'Kane P A King H D Edmondson 《International journal of oral and maxillofacial surgery》1986,15(4):422-424
Button wiring has been used as an alternative to eyelet wiring in the Department of Oral and Dental Surgery of Birmingham General Hospital since 1977. This clinical update reviews 65 patients with mandibular fractures in which button wires were utilised in their treatment. 相似文献
993.
J D Fortenberry R F Hill 《Journal of adolescent health care : official publication of the Society for Adolescent Medicine》1986,7(3):202-204
Incestuous child sexual abuse has received increasing attention recently, but relatively little attention has focused on the multigenerational dimensions of this problem. The case presented places incest into a multigenerational context and demonstrates how quickly family relationships may become eroticized in an uncommon form: between sisters. 相似文献
994.
Comparison of two in vitro methods of bone lead analysis and the implications for in vivo measurements 总被引:4,自引:0,他引:4
L J Somervaille D R Chettle M C Scott A C Aufderheide J E Wallgren L E Wittmers G R Rapp 《Physics in medicine and biology》1986,31(11):1267-1274
Atomic absorption spectrometry and x-ray fluorescence have been used to determine the lead content of metatarsal and tibia bone samples. For a range of bone lead levels from 6.5 to 83 micrograms g-1 of ashed bone there is no evidence of a systematic difference between the two techniques of more than 1 microgram g-1. There is, however, some evidence that random differences between the two in vitro analyses applied to the same bone sample are larger than can be accounted for by known measurement uncertainties. Variations in bone composition could account for these differences. Because the x-ray fluorescence technique is applied in an identical way to in vivo analysis, it is concluded that the uncertainties in in vivo measurements are small. 相似文献
995.
Current status of research activity in American child and adolescent psychiatry: Part I 总被引:1,自引:0,他引:1
T Shapiro D Mrazek H A Pincus 《Journal of the American Academy of Child and Adolescent Psychiatry》1991,30(3):443-448
A survey of research activity of American academic child psychiatrists was completed in February, 1989. The survey demonstrated an increase in research activity since the 1983 report in the Current Status of Child Psychiatry. A definition of a researcher was derived from a study of internists and general psychiatrists and applied to the 488 respondents (78.5% of sample), and it was found that males outnumber females and that researchers contribute significantly more to the literature and education than nonresearchers. Early research exposure and mentoring are important influences on a research career. Recommendations by researchers for future training of researchers are presented. Periodic surveys are encouraged. 相似文献
996.
D Hadley 《Rhode Island dental journal》1986,19(4):6-7, 9-10, 12-6
997.
W D Lovan R A Weaver R J Lentz J K Goodrum B F Withers 《Aviation, space, and environmental medicine》1986,57(4):370-375
The Naval Special Board of Flight Surgeons was established in 1956 for the evaluation of Navy, Marine Corps, and Coast Guard problem aeromedical cases. This paper examines a sample 248 of these cases for the period of 1974-83 with respect to the characteristics of those referred, their referral diagnostic category, and the recommendation of the Special Board regarding return to a flying status. Those cases with a referral diagnostic category of ENT and Ophthalmology were less likely to be returned to flight status. Older, more senior pilots, and pilots with more total flight time were less likely to be returned to unrestricted flying than were their younger, more junior, and less experienced counterparts. Otherwise, no significant difference in outcome based on age, rank, marital status, branch of service, specialty, or flight hours was detected. Overall, 61% of those evaluated by the SBFS were returned to flight status. 相似文献
998.
Superficial bladder cancer: intravesical chemotherapy and tumour progression to muscle invasion or metastases 总被引:2,自引:0,他引:2
G Smith R A Elton G D Chisholm J E Newsam T B Hargreave 《British journal of urology》1986,58(6):659-663
Of 299 patients who presented with superficial bladder cancer (Ta, T1), 60 were treated by intravesical chemotherapy (Epodyl, methotrexate or mitomycin C). The rate of tumour progression to muscle invasion or metastases was identical for each intravesical regime. There was no evidence that mitomycin C promoted tumour progression. Carcinoma in situ in non-tumour-bearing urothelium was the most significant predictive factor for progression to muscle invasion or metastases. 相似文献
999.
The authors describe an original application of real time transducers--initially intended for intracavitary sonography--in thoraco-abdominal scanning. The stic-form probe can be easily slipped under the patient. It is then possible to realize a scan with an upward beam. In the postero-anterior scan, the patient is placed in a supine position. He is motionless. We achieve a better visualization of the liquid collections, since their accumulation is declivious. The method allows a wider sonographic window for thoraco-abdominal and diaphragmatic investigation in sonography. 相似文献
1000.
The impact of percutaneous transluminal angioplasty on the management of peripheral vascular disease 总被引:1,自引:0,他引:1
J B Anderson A P Wolinski I P Wells D C Wilkins B P Bliss 《The British journal of surgery》1986,73(1):17-19
Percutaneous transluminal angioplasty is a well established technique with wide application, but its place in the overall management of peripheral vascular disease is not well defined. This study compares similar groups of patients with peripheral vascular disease in 1981 and 1984, before and after the introduction of the technique to a district general hospital. More patients are now being investigated and treated and this is almost entirely due to the availability of angioplasty. The rates for surgery have not changed. Percutaneous transluminal angioplasty should therefore be seen as a new and separate form of treatment for peripheral vascular disease, not necessarily influencing or replacing surgery, and requiring its own allocation of resources in accordance with the increase in the level of care afforded by the technique. 相似文献