Unverified82% confidenceDecision RuleTime unknown
儿童减压/感统训练用沙画沙盘优先选择细颗粒石英砂（粒度80-120目），流动性好、无粉尘，倒沙时呈丝滑瀑布状；粗砂（40目以下）颗粒感强适合手工造型但不适合幼儿
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