Unverified50% confidenceSolutionTime unknown
正确佩戴时头盔前缘应在眉毛上方两指内，Y型绑带交点位于耳垂正下方，下巴带扣紧后能塞进一指；试戴时低头摇头头盔不应晃动，这是舒适度和防护的前提
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