[KongchangAI]
Unverified85% confidenceDecision RuleTime unknown

PVC管道(现代住宅主流)避免使用高浓度硫酸型疏通剂,强放热会使PVC软化变形;强碱NaOH型对PVC相对安全,但也不宜长时间浸泡超过1小时

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Long-term
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