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???? ???? Shijiazhuang Deye Piping Industries Co., Ltd. ???? HDPE ???? ?????? ???? ????????? ?? ????? ???????? ????????. ???? HDPE ????? ??? ????? ?? ???? ????? ???????? ??? ???? ??????? ????? ?????? ??? ????????. ???? ???? ?????? ??????? ???? ???????? ??? ??? ?????? ????? ?????? ??????? ??????? ??????????? ??? ????? ??????? ????????? ???????? ????????? ??????. ????? ???? HDPE ?????? ???????? ?????? ?????? ????????? ??????? ?????? ???????? ????????. ??? ??? ??????? ????? ??????? ?????? ?? ??????? ??? ???? ??????? ????? ??????? ????? ????????. ??? ????? ???????? ????? ??????? ?????? ???????? ??? ???? ????????? ???????? ??? ???????? ??????? ???? ???????? ???? ???? Shijiazhuang Deye Piping Industries Co., Ltd. ????? ?????? ???? ?????? ????????? ????????. ???? ??? ????? ?????? ?????? ??? ???? HDPE ????? ??? ???? ???? ?? ???? ????