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

???? ??? ?????? ???? 18 ???? Dn450 ?????? ?? ???? Shijiazhuang Deye Piping Industries Co.,Ltd. ?? ?? ????? ????? ?????? ?????? ?? ???? ??????? ????????. ?? ????? ???? ????? ??? ???? ?????? ?????? ????? ??????? ????? ????? ???????? ?? ????????? ????????? ??? ????? ?? ???? ?????? ??? ?? ????? ???? ????? Dn450 ???? 18 ???? ????? ?????? ??????? ?????? ???????? ??? ????? ??????? ??????? ????? ?? ???? ???????. ???? ?????? ??????? ??????? ????? ?????? ???????? ??? ???? ???? ????? ???????? ??????????. ???? ??? ???? ????? ??? 18 ????? ??? ????? ??????? ?????? ???????? ??? ????? ??????. ???? ????? DN450 ??? ?????? ?? ???? ???????? ???? ?????? ??? ???? ???????? ??????? ?????????? ????? ???? Shijiazhuang Deye Piping Industries Co.,Ltd. ????? ?????? ?????? ????? ??????? ????? ????? Dn450 ???? 18 ???? ??? ????????. ?? ???????? ?????????? ???????? ??? ???? ????? ??? ?????? ??????? ????????? ???????? ????????? ??? ???? ?????? ?? ??????? ????? ???????