发布时间:2025-01-26 14:33:48
都可以,只不过PPR出的早,市场占有率和采用率高,CPVC出来没几年,不过类似于PPR,比PPR更耐高温,使用寿命2个都差不多
按照工程勘察设计收费标准2002年修订版当计费额小于200万元时设计收费基价怎么计取
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