Unverified85% confidenceDecision RuleTime unknown
穿线孔径应≥5mm且内壁倒角光滑，孔径过小（<3mm）会导致穿线困难挫伤幼儿信心，孔边有锐边则会磨损串绳造成断裂散落
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85%
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Long-term
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