Unverified85% confidenceDecision RuleTime unknown
沙子材质优先选天然海砂或石英砂(粒径0.2-0.5mm),太细易扬尘刺激呼吸道,太粗触感差;儿童使用应选无尘决明子或专用净化砂,避免普通建筑砂含重金属超标
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