[KongchangAI]
Unverified82% confidenceDecision RuleTime unknown

公路头盔重量控制在200-250g、通风口12个以上适合长距离高强度骑行;山地头盔通常250-350g并带后脑延伸包裹和可拆卸帽檐;城市通勤盔可放宽到350g以内但需牺牲部分散热换取更强抗穿刺

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82%
Confidence
Long-term
Relevance
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curl https://kongchang.com/api/v1/knowledge/claims/146740
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get_claim(id=146740)