Unverified85% confidenceDecision RuleTime unknown
护具尺寸按周长选而非年龄：护膝护肘的松紧带内径需比孩子肢体周长小1-2cm才能防滑脱，头盔头围要精确测量额头上方最宽处，误差超过2cm会导致移位失去保护
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