全文获取类型
收费全文 | 4071826篇 |
免费 | 301665篇 |
国内免费 | 10213篇 |
专业分类
耳鼻咽喉 | 57472篇 |
儿科学 | 130346篇 |
妇产科学 | 111124篇 |
基础医学 | 568452篇 |
口腔科学 | 116939篇 |
临床医学 | 375154篇 |
内科学 | 789250篇 |
皮肤病学 | 91238篇 |
神经病学 | 338001篇 |
特种医学 | 158539篇 |
外国民族医学 | 1438篇 |
外科学 | 609997篇 |
综合类 | 91172篇 |
现状与发展 | 6篇 |
一般理论 | 1720篇 |
预防医学 | 325250篇 |
眼科学 | 94693篇 |
药学 | 301247篇 |
11篇 | |
中国医学 | 7982篇 |
肿瘤学 | 213673篇 |
出版年
2018年 | 43660篇 |
2017年 | 33584篇 |
2016年 | 38155篇 |
2015年 | 43062篇 |
2014年 | 60629篇 |
2013年 | 92050篇 |
2012年 | 122320篇 |
2011年 | 129803篇 |
2010年 | 77835篇 |
2009年 | 74422篇 |
2008年 | 121820篇 |
2007年 | 129400篇 |
2006年 | 131155篇 |
2005年 | 126797篇 |
2004年 | 122198篇 |
2003年 | 117809篇 |
2002年 | 114653篇 |
2001年 | 187044篇 |
2000年 | 192533篇 |
1999年 | 163292篇 |
1998年 | 48483篇 |
1997年 | 43265篇 |
1996年 | 42904篇 |
1995年 | 41613篇 |
1994年 | 38636篇 |
1993年 | 36149篇 |
1992年 | 129754篇 |
1991年 | 125525篇 |
1990年 | 121332篇 |
1989年 | 117243篇 |
1988年 | 108363篇 |
1987年 | 106745篇 |
1986年 | 100817篇 |
1985年 | 96578篇 |
1984年 | 72638篇 |
1983年 | 62030篇 |
1982年 | 37354篇 |
1981年 | 33615篇 |
1979年 | 66747篇 |
1978年 | 47233篇 |
1977年 | 40022篇 |
1976年 | 37492篇 |
1975年 | 39594篇 |
1974年 | 47988篇 |
1973年 | 45810篇 |
1972年 | 43106篇 |
1971年 | 39923篇 |
1970年 | 37306篇 |
1969年 | 35274篇 |
1968年 | 32451篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
992.
Malignant mixed müllerian tumor of the fallopian tube is an extremely rare neoplasm, with less than 30 cases reported. Clinical signs and symptoms are usually nonspecific and include lower abdominal pain, fever, and vaginal bleeding. The age at diagnosis varies from 14 to 76 years, with a mean of 55 years. Prognosis is poor, with only one woman surviving more than five years. Surgery is the treatment of choice, although chemotherapy may be of some benefit. 相似文献
993.
M Troke 《Physiotherapy》2002,88(12):763-764
994.
995.
Background
A standardised suction technique has been used to sample plasma proteins in dermal interstitial fluid (IF) serially for 5 to 6 days from a suction-induced skin mini-erosion. Increased protein concentrations ascribed to inflammation have been shown from day 1 onward. In this study, we assessed the effect of two different extraction pressures on IF sample composition. 相似文献996.
Christine M Sapienza Michael P Cannito Thomas Murry Ryan Branski Gayle Woodson 《J. Speech Lang. Hear. Res.》2002,45(5):830-843
Acoustic analysis of a reading passage was used to identify the abnormal phonatory events associated with adductor spasmodic dysphonia (ADSD) pre- and postinjection of Botulinum Toxin A (Botox). Thirty-one patients (age 22 to 74 years) diagnosed with ADSD were included for study. All patients were new recipients of Botox, and the examination of their voice occurred before and after their initial injection of Botox. Acoustic events were identified from reading samples of the Rainbow Passage produced by each of the patients. These events were examined from sentences containing primarily voiced sound segments. Dependent variables included the number of phonatory breaks, frequency shifts, and aperiodic segments--all variables previously defined by the investigators. Additionally, calculated variables were made of the percentage of time these events occurred relative to the duration of the cumulative voiced segments. A sex- and age-matched control group (+/-2 years) was included for statistical comparison. Results indicated that those with ADSD produced more aberrant acoustic events than the controls. Aperiodicity was the predominant acoustic event produced during the reading, followed by frequency shifts and phonatory breaks. Within the ADSD group, the number of atypical acoustic events decreased following Botox injection. It is important that the occurrence of specific abnormal acoustic events was sufficient to differentiate the disordered speakers from the controls following as well as preceding initial Botox injection, as indicated by discriminant function analysis. This paper complements our previous work using this acoustic analysis method for defining the abnormal events present in the voice of those with ADSD and further suggests that these measures can be used in conjunction with perceptual impressions to differentiate speakers on the basis of initial severity. 相似文献
997.
998.
Adolescent stress is an emerging area of importance in considerations of the health of young people. Exposure to stress predicts a range of both physical and mental health problems in adolescents and relates, as well, to the initiation of important health risk behaviours. Yet the measurement of stress in adolescents has been as fraught with methodological difficulty as it has been for adults. This paper examines the Adolescent Stress Questionnaire (ASQ) which was developed specifically to address the domain of stressors specific to adolescent experience and looks at three cohorts of responses to this questionnaire over time (1995, 1998 and 2001). It assesses the stability of the original 7‐factor structure of the ASQ over time, and while confirmatory factor analysis indicates that stability to be acceptable, it also suggests that either adolescent stressors themselves, or the language by which they are reported, vary sufficiently over time to warrant the refinement of the instrument. Copyright © 2002 John Wiley & Sons, Ltd. 相似文献
999.
1000.