全文获取类型
收费全文 | 33580篇 |
免费 | 2094篇 |
国内免费 | 103篇 |
专业分类
耳鼻咽喉 | 257篇 |
儿科学 | 1168篇 |
妇产科学 | 966篇 |
基础医学 | 3865篇 |
口腔科学 | 408篇 |
临床医学 | 6016篇 |
内科学 | 5581篇 |
皮肤病学 | 368篇 |
神经病学 | 3359篇 |
特种医学 | 633篇 |
外国民族医学 | 1篇 |
外科学 | 3412篇 |
综合类 | 341篇 |
现状与发展 | 1篇 |
一般理论 | 51篇 |
预防医学 | 4642篇 |
眼科学 | 452篇 |
药学 | 2015篇 |
中国医学 | 38篇 |
肿瘤学 | 2203篇 |
出版年
2023年 | 207篇 |
2022年 | 332篇 |
2021年 | 616篇 |
2020年 | 441篇 |
2019年 | 684篇 |
2018年 | 840篇 |
2017年 | 586篇 |
2016年 | 657篇 |
2015年 | 706篇 |
2014年 | 1029篇 |
2013年 | 1637篇 |
2012年 | 2357篇 |
2011年 | 2478篇 |
2010年 | 1318篇 |
2009年 | 1170篇 |
2008年 | 2254篇 |
2007年 | 2441篇 |
2006年 | 2338篇 |
2005年 | 2271篇 |
2004年 | 2107篇 |
2003年 | 2008篇 |
2002年 | 1931篇 |
2001年 | 298篇 |
2000年 | 250篇 |
1999年 | 331篇 |
1998年 | 393篇 |
1997年 | 333篇 |
1996年 | 267篇 |
1995年 | 300篇 |
1994年 | 233篇 |
1993年 | 241篇 |
1992年 | 191篇 |
1991年 | 184篇 |
1990年 | 174篇 |
1989年 | 152篇 |
1988年 | 152篇 |
1987年 | 129篇 |
1986年 | 133篇 |
1985年 | 137篇 |
1984年 | 153篇 |
1983年 | 157篇 |
1982年 | 171篇 |
1981年 | 158篇 |
1980年 | 140篇 |
1979年 | 85篇 |
1978年 | 103篇 |
1977年 | 79篇 |
1976年 | 68篇 |
1975年 | 51篇 |
1974年 | 59篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
1.
Journal of Behavioral Medicine - Evidence supports the use of graphic warnings to educate the public about the health harms of smoking and suggests warnings eliciting negative emotional responses... 相似文献
2.
3.
4.
5.
ABSTRACT Informal settlements remain a public health problem as they lack basic infrastructure. Furthermore, it is challenging to enforce public health regulations and protocols to prevent the spread of infection during a pandemic. This paper was set out to explore the impact of lockdown during COVID-19 among people living in informal settlements. An exploratory qualitative design was utilised. Purposive sampling was used to select research participants. In-depth one-to-one interviews were held involving 30 research participants through a WhatsApp online telephone platform. A thematic approach underpinned by the four stages of data analysis in interpretive phenomenological analysis was utilised to analyse the data. The study found that during the the research participants were affected by lack of space to practice social distancing, over-burdened infrastructure, lack of savings, loss of income and shortage of food, hunger and diseases, anxiety and depression and poor access to education. There is a need to prioritise the needs of informal settlers and endeavour to establish permanent homes. Health promotion and communication initiatives and pandemic awareness programmes are needed to mitigate the impact of lockdown during a pandemic in informal settlements. 相似文献
6.
Feasibility and Diagnostic Potential of Pulmonary Transit Time Measurement by Contrast Echocardiography: A Pilot Study 下载免费PDF全文
7.
Purpose: To describe how central venous access devices (CVADs) are utilized for ambulatory oncology patients and to evaluate the rate of complications. Method: Single institution retrospective study of oncology patients with CVADs who received systemic treatment at the Walker Family Cancer Centre (WFCC) between 1 January and 31 December 2018. Results: A total of 480 CVADS were placed in 305 patients, of which 408 (85%) were peripherally inserted central catheters (PICCs) and 72 (15%) were implanted vascular access devices (PORTs). The incidence of early and late complications was 9% and 24%, respectively. For the entire cohort, the rate of venous thromboembolism (VTE) was 16%, of which 9% were CVAD-related thrombosis (CRTs) and 7% were distant VTE. The CRT rates were similar for PICCs and PORTs (9% vs. 7%). A total of 6% of CVADs were complicated by infection (i.e., localized infections and bacteremia), with a total infection rate of 0.43 and 0.26 per 1000 indwelling days for PICCs and PORTs, respectively. The incidence of central line associated bloodstream infections (CLABSI) was greater for PICCs than PORTs, at a rate of 0.22 compared with 0.08 per 1000 indwelling days, respectively. The premature catheter removal rate was 26% for PICCs and 18% for PORTs. PORTs required more additional hospital visits. Conclusions: PICCs were utilized more frequently than PORTs and had a higher rate of premature removal. The rates of VTE and CRT were similar for both CVAD types. PORTs had a lower rate of infection per 1000 indwelling days. However, the management of PORT related complications required more visits to the hospital and oncology clinic. 相似文献
8.
9.
10.