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PVC ??????? ?????? ??????? ????????
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????? ?????? PVC-C???? ?????? ?????? PVC-C ????? ?? ???? ?????? ????? ?????? PVC-C ???????? ? ????? ????? ??????? ????? ?????? ? ??????? ?...??? ???????? -
PVC-U ?????? ??????? ??????????? ???? Hubei AD Building Materials (17399989993) ?? ????? ?????? ????? ?????? PVC-U ? ????? ???? ?????? GB / T1202.1...??? ????????
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?? ?????? 1 ???? 2
