Unverified90% confidenceDecision RuleTime unknown
18-36月龄选螺丝直径≥3.5cm的大颗粒款，防止误吞；36月龄以上可用直径2-3cm的中号螺丝；6岁以上才适合<2cm的精细螺丝拼装
1
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Long-term
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