收费全文 | 7904篇 |
免费 | 532篇 |
国内免费 | 3172篇 |
安全科学 | 728篇 |
废物处理 | 464篇 |
环保管理 | 609篇 |
综合类 | 4699篇 |
基础理论 | 1308篇 |
环境理论 | 2篇 |
污染及防治 | 2746篇 |
评价与监测 | 384篇 |
社会与环境 | 329篇 |
灾害及防治 | 339篇 |
2024年 | 32篇 |
2023年 | 186篇 |
2022年 | 487篇 |
2021年 | 459篇 |
2020年 | 408篇 |
2019年 | 342篇 |
2018年 | 370篇 |
2017年 | 481篇 |
2016年 | 499篇 |
2015年 | 554篇 |
2014年 | 654篇 |
2013年 | 840篇 |
2012年 | 721篇 |
2011年 | 705篇 |
2010年 | 536篇 |
2009年 | 501篇 |
2008年 | 523篇 |
2007年 | 497篇 |
2006年 | 389篇 |
2005年 | 269篇 |
2004年 | 210篇 |
2003年 | 238篇 |
2002年 | 198篇 |
2001年 | 176篇 |
2000年 | 181篇 |
1999年 | 200篇 |
1998年 | 174篇 |
1997年 | 163篇 |
1996年 | 149篇 |
1995年 | 98篇 |
1994年 | 105篇 |
1993年 | 73篇 |
1992年 | 49篇 |
1991年 | 39篇 |
1990年 | 23篇 |
1989年 | 17篇 |
1988年 | 11篇 |
1987年 | 8篇 |
1986年 | 7篇 |
1985年 | 3篇 |
1984年 | 7篇 |
1983年 | 6篇 |
1982年 | 7篇 |
1981年 | 7篇 |
1980年 | 1篇 |
1978年 | 2篇 |
1977年 | 1篇 |
1975年 | 1篇 |
1957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