全文获取类型
收费全文 | 926452篇 |
免费 | 78446篇 |
国内免费 | 7143篇 |
专业分类
耳鼻咽喉 | 13331篇 |
儿科学 | 25355篇 |
妇产科学 | 25653篇 |
基础医学 | 129868篇 |
口腔科学 | 26619篇 |
临床医学 | 83696篇 |
内科学 | 171791篇 |
皮肤病学 | 17493篇 |
神经病学 | 73001篇 |
特种医学 | 38077篇 |
外国民族医学 | 210篇 |
外科学 | 143153篇 |
综合类 | 39936篇 |
一般理论 | 279篇 |
预防医学 | 71974篇 |
眼科学 | 21964篇 |
药学 | 72695篇 |
67篇 | |
中国医学 | 6558篇 |
肿瘤学 | 50321篇 |
出版年
2018年 | 9392篇 |
2017年 | 8016篇 |
2016年 | 8256篇 |
2015年 | 10920篇 |
2014年 | 15326篇 |
2013年 | 20959篇 |
2012年 | 28886篇 |
2011年 | 30723篇 |
2010年 | 18811篇 |
2009年 | 17227篇 |
2008年 | 27145篇 |
2007年 | 29098篇 |
2006年 | 28706篇 |
2005年 | 28005篇 |
2004年 | 26391篇 |
2003年 | 25182篇 |
2002年 | 23912篇 |
2001年 | 37298篇 |
2000年 | 37734篇 |
1999年 | 31732篇 |
1998年 | 9401篇 |
1997年 | 8606篇 |
1996年 | 8350篇 |
1995年 | 8444篇 |
1994年 | 8039篇 |
1992年 | 26835篇 |
1991年 | 26276篇 |
1990年 | 25788篇 |
1989年 | 24829篇 |
1988年 | 23323篇 |
1987年 | 22968篇 |
1986年 | 21809篇 |
1985年 | 21172篇 |
1984年 | 16395篇 |
1983年 | 13979篇 |
1982年 | 8847篇 |
1981年 | 8179篇 |
1979年 | 16702篇 |
1978年 | 12080篇 |
1977年 | 10138篇 |
1976年 | 9295篇 |
1975年 | 10109篇 |
1974年 | 12617篇 |
1973年 | 12120篇 |
1972年 | 11528篇 |
1971年 | 10672篇 |
1970年 | 10197篇 |
1969年 | 9894篇 |
1968年 | 8890篇 |
1967年 | 8213篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
1.
Li Na Gou Zhong-Ping Du Shuang-Qing Zhu Xiao-Hong Lin Hui Liang Xiu-Fang Wang Yong-Sheng Feng Ping 《Clinical rheumatology》2022,41(3):689-693
Clinical Rheumatology - 相似文献
2.
4.
Lei Qi Mingxing Wang Yuehui Jia Yuanyuan Wang Liangfang Xue Linlin Du Shuxiu Hao Shengqi Su Ruixiang Wang Huixin Sun Chen Feng Guijin Li Qingyu Zeng Cunqi Lv Jiacheng Li Qi Li Yunyan Zhang Tong Wang 《International journal of cancer. Journal international du cancer》2023,153(6):1172-1181
Information regarding the impact of the coronavirus disease 2019 (COVID-19) pandemic on cervical cancer in mainland China is lacking. We explored its impact on the hospital attendance of patients with primary cervical cancer. We included 1918 patients with primary cervical cancer who initially attended Harbin Medical University Cancer Hospital between January 23, 2019, and January 23, 2021. Attendance decreased by 31%, from 1135 in 2019 to 783 in 2020, mainly from January to June (𝜒2 = 73.362, P < .001). The percentage of patients detected by screening decreased from 12.1% in January-June 2019 to 5.8% in January-June 2020 (𝜒2 = 7.187, P = .007). Patients with stage I accounted for 28.4% in 2020 significantly lower than 36.6% in 2019 (𝜒2 = 14.085, P < .001), and patients with stage III accounted for 27.1% in 2020 significantly higher than 20.5% in 2019 (𝜒2 = 11.145, P < .001). Waiting time for treatment was extended from 8 days (median) in January-June and July-December 2019 to 16 days in January-June (𝜒2 = 74.674, P < .001) and 12 days in July-December 2020 (𝜒2 = 37.916, P < .001). Of the 179 patients who delayed treatment, 164 (91.6%) were for the reasons of the healthcare providers. Compared to 2019, the number of patients in Harbin or non-Harbin in Heilongjiang Province and outside the province decreased, and cross-regional medical treatment has been hindered. The COVID-19 pandemic has negatively impacted cervical cancer patient attendance at the initial phase. These results are solid evidence that a strategy and mechanism for the effective attendance of cervical cancer patients in response to public health emergencies is urgently needed. 相似文献
5.
S. M. White C. L. Shelton A. W. Gelb C. Lawson F. McGain J. Muret J. D. Sherman representing the World Federation of Societies of Anaesthesiologists Global Working Group on Environmental Sustainability in Anaesthesia 《Anaesthesia》2022,77(2):201-212
The Earth’s mean surface temperature is already approximately 1.1°C higher than pre-industrial levels. Exceeding a mean 1.5°C rise by 2050 will make global adaptation to the consequences of climate change less possible. To protect public health, anaesthesia providers need to reduce the contribution their practice makes to global warming. We convened a Working Group of 45 anaesthesia providers with a recognised interest in sustainability, and used a three-stage modified Delphi consensus process to agree on principles of environmentally sustainable anaesthesia that are achievable worldwide. The Working Group agreed on the following three important underlying statements: patient safety should not be compromised by sustainable anaesthetic practices; high-, middle- and low-income countries should support each other appropriately in delivering sustainable healthcare (including anaesthesia); and healthcare systems should be mandated to reduce their contribution to global warming. We set out seven fundamental principles to guide anaesthesia providers in the move to environmentally sustainable practice, including: choice of medications and equipment; minimising waste and overuse of resources; and addressing environmental sustainability in anaesthetists’ education, research, quality improvement and local healthcare leadership activities. These changes are achievable with minimal material resource and financial investment, and should undergo re-evaluation and updates as better evidence is published. This paper discusses each principle individually, and directs readers towards further important references. 相似文献
7.
8.
Qiang Liu Zhongbiao Xu Kaixuan Zhao W. Scott Hoge Xinyuan Zhang Yingjie Mei Qiqi Lu Thoralf Niendorf Yanqiu Feng 《NMR in biomedicine》2022,35(5):e4652
The purpose of this study was to investigate the feasibility of two-dimensional (2D) navigated, interleaved multishot echo-planar imaging (EPI) to enhance kidney diffusion-weighted imaging (DWI) in rats at 7.0 T. Fully sampled interleaved four-shot EPI with 2D navigators was tailored for kidney DWI (Sprague–Dawley rats, n = 7) on a 7.0-T small bore preclinical scanner. The image quality of four-shot EPI was compared with T2-weighted rapid acquisition with relaxation enhancement (RARE) (reference) and single-shot EPI (ss-EPI) without and with parallel imaging (PI). The contrast-to-noise ratio (CNR) was examined to assess the image quality for the EPI approaches. The Dice similarity coefficient and the Hausdorff distance were used for evaluation of image distortion. Mean diffusivity (MD) and fractional anisotropy (FA) were calculated for renal cortex and medulla for all DWI approaches. The corticomedullary difference of MD and FA were assessed by Wilcoxon signed-rank test. Four-shot EPI showed the highest CNR among the three EPI variants and lowest geometric distortion versus T2-weighted RARE (mean Dice: 0.77 for ss-EPI without PI, 0.88 for ss-EPI with twofold undersampling, and 0.92 for four-shot EPI). The FA map derived from four-shot EPI clearly identified a highly anisotropic region corresponding to the inner stripe of the outer medulla. Four-shot EPI successfully discerned differences in both MD and FA between renal cortex and medulla. In conclusion, 2D navigated, interleaved multishot EPI facilitates high-quality rat kidney DWI with clearly depicted intralayer and interlayer structure and substantially reduced image distortion. This approach enables the anatomic integrity of DWI-MRI in small rodents and has the potential to benefit the characterization of renal microstructure in preclinical studies. 相似文献
9.
10.