Unverified90% confidenceDecision RuleTime unknown
3岁以下幼儿应选择鱼身直径≥4cm的整体式磁性鱼，避免磁铁外露；单块磁铁若脱落必须大于3.17cm（无法通过小零件测试圆筒），否则存在误吞风险
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