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???? ??? ?????? ???????? Dn400 16 ?? ???? Shijiazhuang Deye Piping Idndustrys Co.,Ltd. ?? ???? ???? ?????? ?????? ?? ???? ???? ?????? ?????? ?? ???? ????????. ????? ??? ?????? ???? Dn400 ???? 16 ????? ??? ????? ??????? ????????? ?? ????????? ???????? ????? ??????. ?? ????? ???? ??? ?????? ???????? ?? ???? ????? ????? ????? ????? ?????? ????? ?????? ??? ????? ??????. ??? ???? ?????? ??????? ????????? ?????? ??? ?????? ?? ????? ??????? ??????? ???????? ?? ????? ?? ????? ???????? ???????? ??????? ??? ??????? ???? ??? ?????? ?????? ?????? ??????? ?? ??????? ??? ???? ????? ?????? ???? ???? ????????. ???? ?????? ??????? ????? ?? ?????????? ??? ?? ??? ?????? ??????? ????? ??????? ???????? ??????????? ????? ?? ???? Shijiazhuang Deye Piping Idndustrys Co.,Ltd. ????? ???? Dn400 16 ?????? ?????? ????? ?????? ????? ????? ??????? ??? ???? ???? ??? ??????? Dn400 16 ?????? ???? ???????? ???? ????????? ???????? ?????? ??. ?? ?? ??????? ????? ??? ?????? ?????? ??????? ?????? ?? ?????? ??????? ????