Unverified80% confidenceDecision RuleTime unknown
带握持孔(挖孔或凹槽)的浮板比纯平板更适合儿童,孩子小手可勾住孔洞防止湿滑脱手;但握持孔边缘必须做圆角处理,检查孔内壁是否光滑无毛刺
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