收费全文 | 16182篇 |
免费 | 1046篇 |
国内免费 | 5582篇 |
安全科学 | 1320篇 |
废物处理 | 1021篇 |
环保管理 | 1339篇 |
综合类 | 9620篇 |
基础理论 | 2503篇 |
污染及防治 | 4930篇 |
评价与监测 | 767篇 |
社会与环境 | 622篇 |
灾害及防治 | 688篇 |
2024年 | 16篇 |
2023年 | 257篇 |
2022年 | 826篇 |
2021年 | 771篇 |
2020年 | 616篇 |
2019年 | 523篇 |
2018年 | 654篇 |
2017年 | 731篇 |
2016年 | 707篇 |
2015年 | 924篇 |
2014年 | 1310篇 |
2013年 | 1655篇 |
2012年 | 1412篇 |
2011年 | 1439篇 |
2010年 | 1195篇 |
2009年 | 1168篇 |
2008年 | 1255篇 |
2007年 | 1037篇 |
2006年 | 1039篇 |
2005年 | 662篇 |
2004年 | 489篇 |
2003年 | 548篇 |
2002年 | 495篇 |
2001年 | 364篇 |
2000年 | 445篇 |
1999年 | 385篇 |
1998年 | 311篇 |
1997年 | 335篇 |
1996年 | 287篇 |
1995年 | 224篇 |
1994年 | 172篇 |
1993年 | 142篇 |
1992年 | 131篇 |
1991年 | 75篇 |
1990年 | 68篇 |
1989年 | 28篇 |
1988年 | 30篇 |
1987年 | 21篇 |
1986年 | 15篇 |
1985年 | 9篇 |
1984年 | 7篇 |
1983年 | 8篇 |
1982年 | 13篇 |
1981年 | 8篇 |
1979年 | 1篇 |
1976年 | 1篇 |
1958年 | 1篇 |
Methods: A cross-sectional study was used to interview 3,151 electric bike/moped riders in southern China. Electric bike/moped-related road traffic injuries that occurred from July 2014 to June 2015 were investigated. Data were collected by face-to-face interviews and analyzed between July 2015 and June 2017.
Results: The prevalence of electric bike/moped-related road traffic injuries among the investigated riders was 15.99%. Electric bike/moped-related road traffic injuries were significantly associated with category of electric bike (adjusted odds ratio [AOR] = 1.36, 95% confidence interval [CI], 1.01–1.82), self-reported confusion (AOR = 1.77, 95% CI, 1.13–2.78), history of crashes (AOR = 6.14, 95% CI, 4.68–8.07), running red lights (AOR = 3.57, 95% CI, 2.42–5.25), carrying children while riding (AOR = 1.96, 95% CI, 1.37–2.85), carrying adults while riding (AOR = 1.68, 95% CI, 1.23–2.28), riding in the motor lane (AOR = 2.42, 95% CI, 1.05–3.93), and riding in the wrong traffic direction (AOR = 1.63, 95% CI, 1.13–2.35). In over 77.58% of electric bike/moped-related road traffic crashes, riders were determined by the police to be responsible for the crash. Major crash-causing factors included violating traffic signals or signs, careless riding, speeding, and riding in the wrong lane.
Conclusion: Traffic safety related to electric bikes/moped is becoming more problematic with growing popularity compared with other 2-wheeled vehicles. Programs need to be developed to prevent electric bike/moped-related road traffic injuries in this emerging country. 相似文献