Unverified90% confidenceDecision RuleTime unknown

更换内衬后必须做贴合安全测试：系紧下巴带后左右转头和上下点头，头盔应随头部同步移动且内衬不产生滑动空隙，否则说明厚度或固定不匹配，紧急情况下头盔可能脱落

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Unverified头盔下颌带应能插入两指为宜、张嘴时能感觉头盔向下压，佩戴后左右晃动头盔皮肤应随之移动而非头盔滑动，否则尺寸不合防护失效82% similar Unverified头围调节应选后部旋钮或魔术贴无级调节设计，可适配不同发量和帽内佩戴；固定尺码款容易过紧压迫或过松滑动，滑动的头盔在跌倒瞬间可能移位失去防护作用82% similar

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