Unverified85% confidenceDecision RuleTime unknown
护脊背包背板缓冲材质厚度应≥8mm的S型EVA或蜂窝气垫，才能形成有效的悬浮空隙分散脊柱压力；低于5mm的普通海绵仅是软填充，护脊功能形同虚设
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