Unverified78% confidenceDecision RuleTime unknown
计算绑带长度：单向缠绕1圈约需（礼盒周长+30cm打结余量）；十字缠绕打蝴蝶结约需（盒长+盒宽）×2＋60cm，双层花结再加40cm，采购时按此公式避免长度不足
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