头盔标准ECE R22-2002和GB 811-2010机械强度项目对比及完善性研究
두회표준ECE R22-2002화GB 811-2010궤계강도항목대비급완선성연구
Comparative analysis and perfecting research of mechanical strength items between helmet standards of ECE R22-2002 and GB 811-2010
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