Unverified75% confidenceDecision RuleTime unknown
浮石研磨产生的粉末与污垢混合后颜色（黄褐色为尿碱、灰白为水垢）可判断清理进度，但持续变黑或磨块快速消耗说明表面粗糙度过高，应停止研磨改用化学清洁
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