???? ???? ???? ?????? DN450 ???? 18 ???? ?? ????? ????? ??????

???? ????? ??????? Dn450 ???? 18 ???? ?? ???? ????? ???? ?????? ?? ?????? ??????? ?????? ???? Shijiazhuang Deye Piping Industry Co., Ltd. ?? ????? ??? ?????? ???? ????? ????? ?????? ?????? ???????? ?? ????????? ??????? ???? ????? ??????? Dn450 ???? 18 ???? ????? ??????? ????? ?? ???????? ??? ?? ??? ????? ?????? ??????????????? ?????? ??????. ????? ?????? ??? ?????? ??? ?? ????? ?? ??? ?????? ??????? ????????. ?? ????? ?????? ?? ???? ????? ??????? ??? ???? ?????? ?????? ?????????? ????? ?????? ?? ????? ?????? ?????? ???? ???? ?? ??????? ??? ????? ??????? ?????? ???? ??????? ?? ???? ????????. ?? ?????? ????? ????? ????? ?????? ?????? ??????? ???????? ??? ????? ?????? ??????? ?? ????????? ??????? ?? ???? Shijiazhuang Deye Piping Industry Co., Ltd.? ??? ??????? ?????? ?????? ????? ?????? ???? ???? ?????? ???????. ???? ????? ??????? Dn450 ???? 18 ???? ?? ????? ??? ???????? ??????? ????????? ?????? ???? ?????? ????????