???? ??????? ???? 18 ???? Dn450 ????????? ???????? - ???? ????!

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