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 ?????? ?????? ????? ??????? ?????? (PVC-U) ????? ????? ? ????? ?? GB / T 5836.1-1992 ? ?????? Hubei PVC ? ???? ??????? Wuhan PVC ??????? ?? Hubei AD Building Materials Co. ? Ltd. ? ???? ????? ?????? PVCU ? ????? ?????? ??????? ?????? ?????? ????? ? ?????????? ??????? ? ????? ??? ?? ??????? ??? ??????. 







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