全文获取类型
收费全文 | 26128篇 |
免费 | 2718篇 |
国内免费 | 426篇 |
专业分类
耳鼻咽喉 | 72篇 |
儿科学 | 545篇 |
妇产科学 | 1103篇 |
基础医学 | 2354篇 |
口腔科学 | 126篇 |
临床医学 | 4007篇 |
内科学 | 1903篇 |
皮肤病学 | 113篇 |
神经病学 | 8543篇 |
特种医学 | 209篇 |
外科学 | 964篇 |
综合类 | 2930篇 |
现状与发展 | 2篇 |
一般理论 | 5篇 |
预防医学 | 1794篇 |
眼科学 | 62篇 |
药学 | 2248篇 |
46篇 | |
中国医学 | 1590篇 |
肿瘤学 | 656篇 |
出版年
2024年 | 53篇 |
2023年 | 564篇 |
2022年 | 546篇 |
2021年 | 1120篇 |
2020年 | 1286篇 |
2019年 | 1195篇 |
2018年 | 1130篇 |
2017年 | 1213篇 |
2016年 | 1272篇 |
2015年 | 1102篇 |
2014年 | 1741篇 |
2013年 | 2457篇 |
2012年 | 1517篇 |
2011年 | 1544篇 |
2010年 | 1362篇 |
2009年 | 1311篇 |
2008年 | 1259篇 |
2007年 | 1237篇 |
2006年 | 1070篇 |
2005年 | 907篇 |
2004年 | 720篇 |
2003年 | 687篇 |
2002年 | 585篇 |
2001年 | 445篇 |
2000年 | 314篇 |
1999年 | 221篇 |
1998年 | 188篇 |
1997年 | 193篇 |
1996年 | 128篇 |
1995年 | 169篇 |
1994年 | 177篇 |
1993年 | 137篇 |
1992年 | 155篇 |
1991年 | 130篇 |
1990年 | 104篇 |
1989年 | 124篇 |
1988年 | 114篇 |
1987年 | 119篇 |
1986年 | 100篇 |
1985年 | 119篇 |
1984年 | 87篇 |
1983年 | 66篇 |
1982年 | 66篇 |
1981年 | 50篇 |
1980年 | 43篇 |
1979年 | 34篇 |
1978年 | 24篇 |
1977年 | 26篇 |
1976年 | 19篇 |
1975年 | 15篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
32.
Dae Lim Koo Kwang Ik Yang Jee Hyun Kim Daeyoung Kim Jun‐Sang Sunwoo Young Hwangbo Hwa Reung Lee Seung Bong Hong 《Journal of sleep research》2021,30(1):e13063
The present study aimed to examine the association between morningness‐eveningness preferences, sleep duration, weekend catch‐up sleep duration and depression among Korean high‐school students. A total of 8,655 high‐school students participated from 15 districts in South Korea and completed an online self‐report questionnaire. The following sleep characteristics were assessed: weekday and weekend sleep duration, weekend catch‐up sleep duration, morningness‐eveningness preference, perceived sufficiency of sleep, self‐reported snoring and sleep apnea, daytime sleepiness, and sleep environment. Age, gender, body mass index, number of private classes, proneness to internet addiction, and depressive mood were also evaluated. A logistic regression analysis was conducted to compute odds ratios for the association between depression and sleep characteristics, after controlling for relevant covariates. Eveningness preference was a significant predictor of depressive mood (adjusted OR, 1.71; 95% CI, 1.47–1.99). Weekend CUS durations that were ≥2 hr and enrollment in numerous private classes were associated with a lower risk for depression (0.68, 0.55–0.85; 0.76, 0.60–0.95; respectively). Female gender, underweight and obese body weight, short weekday sleep durations, excessive daytime sleepiness, perceived excessiveness and insufficiency of sleep, self‐reported snoring and sleep apnea, proneness to internet addiction and a non‐optimal sleep environment were associated with an increased risk for depression. Eveningness preference and insufficient weekday sleep duration were associated with an increased risk for depression. Weekend CUS duration ≥2 hr reduced the risk for depression. Diverse aspects, including sleeping habits and sleep‐related environmental factors, should be considered to reduce depressive symptoms in late adolescents. 相似文献
33.
34.
35.
Though cerebrovascular complications of pregnancy remain relatively rare, they represent a potentially devastating event that necessitates prompt identification and treatment. Eighteen percent of strokes occurring in young women are linked to pregnancy. They occur mostly in the third trimester or during the post-partum period. Their biggest risk factors are hypertension, preeclampsia/eclampsia and migraine. Cerebrovascular events occurring during this period may involve specific pathophysiological processes that include embolic phenomena or endothelial dysfunction, but can also have common etiologies that are simply favored by the context of pregnancy. Thus, posterior encephalopathy and vasoconstriction cerebral syndrome are relatively frequently involved in cerebrovascular complications of pregnancy. Other very specific causes like amniotic fluid embolism or postpartum cardiomyopathy can also be responsible for such events. The management of stroke during pregnancy must be multidisciplinary and include a neurovascular expertise. Some conditions can lead to a long-life follow-up and modify the management of a future pregnancy. 相似文献
36.
Praerna H. Bhargav Preethi V. Reddy Ramajayam Govindaraj Kankan Gulati Arya Ravindran D. Gayathri Sneha J. Karmani Kaviraja Udupa Ganesan Venkatasubramanian Mariamma Philip Monojit Debnath Rose Dawn Bharath T. N. Sathyaprabha Bangalore N. Gangadhar Kesavan Muralidharan 《Revue canadienne de psychiatrie》2021,66(2):179
37.
38.
39.
40.