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?????? ?????? ????????? ??? GBT19472.1-2004 ????? ?? ???? ?????? ??????? ??? ????? ????? (PE) ???? 1 ???? ?????? ?? ????? ??? ?????

2025-04-01

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??? ????? ????????? ??? ???? ?????? ?? ????? HDPE ???. ??? ????? ????????? ???? ??? ?? ??? 2004 ???. ????????? ?? ??? 2019 ?? ??? ??? ???. ????????? ???? ????????? ??? ???? ?????? ?? ????? GB / T19472.1-2019HDPE ???.

?????? ???? ?????? ?? ????? HDPE ???? ?

???? ?????? ?? ????? PVC HPVC ?? ??????? ????

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