???? ??????? 16 ???? Dn450 | ?????? ????? ?????? ????????? ???????

????? ???? Shijiazhuang Deye Piping Industries Co., Ltd. ?????? ???? ??????? Dn450 ???? 16 ????? ??? ?? ????? ????? ?????? ?? ???? ??????? ???????? ?? ????? ???????? ????????? ??? ?? ????? ???? ??????? ????? ??? ??????? ????? ????? ????????? ??? ???? ??????? ?????????? ??????? ???? ?????. ??? ????? ????? ???? ????? ?????? ??????? ?????? ??? ?????? ?????? ?? ??????? ???? ??????? Dn450 ???? 16 ???? ????? ??????? ????? ?? ?????????? ??? ?? ??? ??????? ?????? ??????? ???? ????? ????? ????????? ?????????? ???????. ????? ???????? ????? ?????? ?????? ??????? ?? ??????? ??? ????? ?????? ????? ??????? ???????? ?? Shijiazhuang Deye Piping Industries Co., Ltd.? ??? ??????? ?????? ?????? ????? ?????? ????? ????? ??????. ??? ???? ??????? Dn450 ???? 16 ???? ?????? ????? ??? ??????? ?? ????? ???????? ??????? ?? ????? ????????. ???? ??? ????? ?????? ?????? ?? ???? ??????? ????? ??? ???????? ??? ???? ?? ???? ???????